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[Feature] SM level profiler #1305

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Merged
merged 3 commits into from
Jul 23, 2025
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Edenzzzz
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📌 Description

Simply add smid into the profiler tag. Now it looks like this
image
Also fixed profiler install in pyproject.toml

cc @happierpig @yzh119

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Summary of Changes

Hello @Edenzzzz, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant upgrade to the existing profiling system by integrating Streaming Multiprocessor (SM) IDs into the collected trace data. This change provides a more detailed, hardware-aware view of execution, which is crucial for optimizing performance. Alongside this core feature, I've also addressed a packaging configuration issue to ensure the profiler module is correctly installed.

Highlights

  • Profiler Enhancement: I've enhanced the profiler by incorporating the Streaming Multiprocessor (SM) ID into the profiling tags. This allows for more granular performance analysis, enabling a deeper understanding of execution at the hardware level.
  • Data Interpretation and Visualization: The decode_tag function and the export_to_perfetto_trace logic have been updated to correctly interpret and visualize the new SM-level profiling data. This includes dynamically creating Perfetto process and thread groups, now organized by SM ID and block index for clearer trace views.
  • Build System Fix: I've corrected the pyproject.toml configuration to ensure the flashinfer.profiler module is properly included during package installation, resolving a potential issue with the profiler's availability.
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Code Review

This pull request introduces SM-level profiling capabilities by including the SM ID in the profiler tag. The changes involve modifications in both the C++ header and the Python code. A critical issue was identified in the Python profiler data processing logic where the decoding of the tag was not correctly updated, potentially leading to incorrect profiling results. Additionally, suggestions were made to improve type correctness in the C++ header and to add a data type check in the Python code.

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Great work, I encourage renaming it to threadblock_id or cta_id instead as there are cases that there are more than one cta in the same sm.
Ignore my comments, you were using ptx instruction to fetch sm_id, which looks correct to me!

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LGTM, thank you!

@yzh119 yzh119 merged commit 238f1d2 into flashinfer-ai:main Jul 23, 2025
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2 participants