[MoE] Improvement of shared expert overlap, support shared expert overlap for FlexDispatcher #2207
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@fanshiqing can you please take a look at this MR? |
yanring
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Skylion007
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Nov 11, 2025
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/ok to test 3e308ac |
yanring
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1. Add shared expert overlap for FlexDispatcher 2. Add stream wait for cases where CUDA_DEVICE_MAX_CONNECTIONS> 1 to prevent shared expert GEMM launched too early. 3. Change fc1 location of shared experts in A2A dispatcher for better overlap.
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/ok to test 06db4ba |
yaox12
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Dec 4, 2025
fanshiqing
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Dec 5, 2025
| permutated_local_input_tokens, | ||
| self.output_splits, | ||
| self.input_splits, | ||
| use_nccl_stream=True, |
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Should we also make use_nccl_stream=True or False configurable?
In other words, if use_nccl_stream=True always gives benefits even without --shared-expert-overlap? That's doubtful.
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Good catch! Change the use_nccl_stream=True only when --shared-expert-overlap is used.
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/ok to test 7a6d270 |
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/ok to test 3dcb728 |
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What does this PR do ?
Design doc: https://docs.google.com/document/d/1whtnUiw1hpfdkjFss_g5P8fyIT9xBA5XJvmdklFes48/edit?usp=sharing
Changelog:
Contribution process
flowchart LR A[Pre-checks] --> B[PR Tests] subgraph Code Review/Approval C1[Expert Review] --> C2[Final Review] end B --> C1 C2 --> D[Merge]Pre-checks
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