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enable flashinfer moe kernel for DP + EP #36838

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enable flashinfer moe kernel for DP + EP #36838

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ff3ff57
flashinfer dp + ep
czhu-cohere Mar 12, 2026
65bcaae
test
czhu-cohere Mar 12, 2026
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8 changes: 1 addition & 7 deletions vllm/model_executor/layers/fused_moe/oracle/unquantized.py
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,6 @@ def _make_log_backend(backend: UnquantizedMoeBackend):
flashinfer_cutlass_available = (
has_flashinfer_cutlass_fused_moe()
and use_ep
and (not use_dp)
and current_platform.has_device_capability(90)
)
Comment on lines 97 to 101
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@gemini-code-assist gemini-code-assist bot Mar 12, 2026

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high

This change enables the FlashInfer CUTLASS MoE kernel for configurations with Data Parallelism (use_dp=True). However, the corresponding tests in tests/kernels/moe/test_unquantized_backend_selection.py have not been updated to reflect this. The existing test test_select_cuda_flashinfer_cutlass_backend explicitly sets use_dp=False and includes a comment stating that CUTLASS does not support DP. To ensure the correctness of this feature and prevent future regressions, please add a new test case that validates the behavior when use_dp=True.

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@czhu-cohere czhu-cohere Mar 12, 2026

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added test

flashinfer_trtllm_moe_enabled = (
Expand Down Expand Up @@ -161,18 +160,13 @@ def _make_log_backend(backend: UnquantizedMoeBackend):
"to enable it for better performance.",
scope="local",
)
elif use_ep and (not use_dp):
elif use_ep:
logger.info_once(
"FlashInfer MoE is available for EP"
" but not enabled, consider setting"
" VLLM_USE_FLASHINFER_MOE_FP16=1 to enable it.",
scope="local",
)
elif use_dp:
logger.info_once(
"FlashInfer CUTLASS MoE is currently not available for DP.",
scope="local",
)
backend = UnquantizedMoeBackend.TRITON
if current_platform.is_xpu():
backend = UnquantizedMoeBackend.XPU
Expand Down
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