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[ROCm] Use unreg path for custom all-reduce during CUDA graph capture#19162

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HaiShaw merged 1 commit intosgl-project:mainfrom
zyzshishui:ar
Feb 23, 2026
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[ROCm] Use unreg path for custom all-reduce during CUDA graph capture#19162
HaiShaw merged 1 commit intosgl-project:mainfrom
zyzshishui:ar

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@zyzshishui
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Motivation

Super tiny fix, needed to be compatible with torch_memory_saver, also aligns with cuda's behavior

Modifications

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Benchmarking and Profiling

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Summary of Changes

Hello @zyzshishui, 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 small but critical fix to the custom all-reduce mechanism, specifically targeting ROCm environments during CUDA graph capture. The change ensures proper interaction with torch_memory_saver by conditionally using an unregistered all-reduce path, thereby harmonizing ROCm's distributed communication behavior with that of CUDA under similar conditions.

Highlights

  • ROCm CUDA Graph Capture: Implemented a conditional call to all_reduce_unreg for ROCm (HIP) when tms_cudagraph is enabled during CUDA graph capture.
  • Compatibility: Ensures compatibility with torch_memory_saver for ROCm, aligning its behavior with CUDA's approach under similar conditions.

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Changelog
  • python/sglang/srt/distributed/device_communicators/custom_all_reduce.py
    • Added a conditional check within the custom_all_reduce function to use all_reduce_unreg for ROCm when tms_cudagraph is active during CUDA graph capture.
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Code Review

This pull request introduces a small but important fix for custom all-reduce on ROCm platforms during CUDA graph capture. By using the unregistered all-reduce path when tms_cudagraph is enabled, it aligns the behavior with the existing CUDA implementation, which is a good consistency improvement. The change is correct and well-motivated. I've added a minor suggestion to improve code conciseness.

Comment on lines +414 to 416
if self.tms_cudagraph:
return self.all_reduce_unreg(input)
return self.all_reduce_reg(input)
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medium

For better readability and conciseness, you can use a conditional expression (ternary operator) to simplify this logic.

                    return self.all_reduce_unreg(input) if self.tms_cudagraph else self.all_reduce_reg(input)

@zyzshishui
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/tag-run-ci-label

@HaiShaw
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HaiShaw commented Feb 23, 2026

/tag-and-rerun-ci

@HaiShaw HaiShaw merged commit 4f3dc1e into sgl-project:main Feb 23, 2026
148 of 161 checks passed
@zyzshishui zyzshishui deleted the ar branch February 23, 2026 16:35
xiaobaicxy added a commit to xiaobaicxy/sglang that referenced this pull request Feb 24, 2026
…o xverse_moe

* 'xverse_moe' of https://github.com/xiaobaicxy/sglang: (275 commits)
  fix: add missing blank line after docstring in serving_transcription.py (sgl-project#19206)
  Whisper model support & `/v1/audio/transcriptions` endpoint & benchmark (sgl-project#16983)
  fix: patch docker image fixes (sgl-project#19100)
  [PD-Disagg] Unify prefill info data transition flow, all with `PrefillServerInfo` (sgl-project#19195)
  [CI] Tiny enhance the dp attention load blance benchmark (sgl-project#19194)
  add new ci user (sgl-project#19133)
  [CI] fix the teardown output of disaggregation test (sgl-project#19193)
  [PD-Disagg] Support query dp rank from bootstrap server. (sgl-project#19168)
  [Kernel Slimming] Migrate AWQ marlin repack kernel to JIT (sgl-project#18949)
  [Diffusion] Match rotary_embedding module name style (sgl-project#19179)
  [Refactor] Split rotary_embedding.py into a modular package (sgl-project#19144)
  [NPU] bump sgl-kernel-npu to 2026.02.01.post2 (sgl-project#19178)
  Use single mma warp group for short q_len in FA to optimize decoding performance (sgl-project#18985)
  Reorganize topk logic to clean up code and expose logical experts (sgl-project#16945)
  [ROCm] Use unreg path for custom all-reduce during CUDA graph capture (sgl-project#19162)
  [diffusion] feat: detect Flux2 custom VAE path from component_paths (sgl-project#19170)
  [AMD] ENV flags tuning and cleanup (sgl-project#19176)
  Fix bench_one_batch_server by moving the print statements (sgl-project#19175)
  Update rocm7.2 Dockerfile to install amdsmi for QuickReduce Initialization (sgl-project#19091)
  Revert "Refactor graph input buffers (sgl-project#18991)" (sgl-project#19173)
  ...
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2 participants