Optimize the performance of the Combine Ant Moving function.

[oagniqgnat]

Modification

Pptimize the performance of the 'Combine Ant Moving' function by removing several broad PipeBarrier<PIPE_ALL>() calls that likely introduced unnecessary waiting, and replacing one with a more granular SyncFuncAscendC::HardEvent::MTE2_S().

Benchmarking and Profiling

• hidden=4096

• hidden=7168

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

[gemini-code-assist]

Summary of Changes

Hello @oagniqgnat, 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 focuses on optimizing the performance of the 'Combine Ant Moving' function by refining its internal synchronization mechanisms. The primary approach involves removing several broad PipeBarrier<PIPE_ALL>() calls that likely introduced unnecessary waiting, and replacing one with a more granular SyncFunc<AscendC::HardEvent::MTE2_S>(). This targeted adjustment aims to streamline execution flow and enhance efficiency within the CamMoeCombineNormalMultiRound class.

Highlights

• Synchronization Refinement: Multiple instances of the broad PipeBarrier<PIPE_ALL>() synchronization primitive have been removed from various methods within the CamMoeCombineNormalMultiRound class.
• Targeted Synchronization: One instance of PipeBarrier<PIPE_ALL>() was replaced with a more specific SyncFunc<AscendC::HardEvent::MTE2_S>(), indicating a move towards finer-grained and more efficient synchronization.
• Performance Optimization: These changes are aimed at reducing unnecessary global synchronization overhead, thereby improving the overall performance of the 'Combine Ant Moving' function by allowing operations to proceed without excessive waiting.

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[gemini-code-assist]

Code Review

This pull request introduces performance optimizations to the CamMoeCombineNormalMultiRound function by refining its synchronization strategy. The changes primarily consist of removing redundant PipeBarrier<PIPE_ALL>() calls where synchronization is already handled by other mechanisms later in the code flow. Additionally, one general-purpose barrier has been replaced with a more specific and efficient SyncFunc to target only the necessary hardware unit.

These modifications are well-reasoned and demonstrate a solid understanding of the underlying hardware's synchronization primitives, which is crucial for low-level kernel optimization. The changes should lead to improved performance without compromising correctness. The overall implementation is of high quality.