Amd Att Trace

AMD Advanced Thread Trace

Use scripts/att_trace.py for the reproducible parts of ATT collection. Do not recreate rocprofv3 commands or decide that a raw .att file is viewer-ready by inspection alone.

Authorization and scope

• Collect a new trace only when the user explicitly asks to run or profile a workload. Reading, validating, or packaging an existing trace is read-only.
• Check GPU occupancy before collection and choose an idle device. Do not stop another user's job or run killgpu.sh unless explicitly authorized.
• Keep ATT diagnostics separate from correctness and end-to-end performance measurements. A trace is not a correctness result or a stable benchmark.
• Never overwrite an existing non-empty output directory or archive.

Workflow

1. Establish the application command, kernel regex, steady-state dispatch number, GPU, and output label. State any inferred dispatch numbering.
2. Run att_trace.py probe. Use a profiler that exposes --att and a matching decoder directory. Prefer a profiler and target application from compatible ROCm installations.
3. Use collect --dry-run when command selection or quoting is uncertain.
4. Collect exactly the requested dispatch. Use a unique output directory.
5. Treat collection as successful only when the automatic viewer-bundle validation passes.
6. Package the complete trace root with package; never transfer only the raw .att files.
7. Report the trace root, archive and checksum if packaged, selected profiler and decoder, kernel regex, dispatch number, and decoded UI directory.

Commands

python scripts/att_trace.py probe

python scripts/att_trace.py collect \
  --output /tmp/my-att \
  --name my-kernel \
  --gpu 0 \
  --kernel-regex 'my_kernel' \
  --dispatch 6 \
  -- <application> <arguments>

python scripts/att_trace.py validate /tmp/my-att
python scripts/att_trace.py package /tmp/my-att

python scripts/att_trace.py window /tmp/my-att \
  --loop-pc 0x2388 --first 10 --last 14

Iteration windows are zero-based by default and end at the next loop-marker occurrence after --last. Choose a loop marker that appears once per loop iteration; barriers can produce multiple ATT events. Record unrolling such as "one outer iteration represents two logical K tiles" instead of silently equating outer-loop and logical-tile iterations.

References

• Read references/rocprofv3.md when choosing ATT options, a profiler installation, or a dispatch.
• Read references/viewer-format.md when validating decoded output, transferring a bundle, or deriving cycle windows.