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[All Reduce] Change default backend of Flashinfer All Reduce to trtllm #35793

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Merged
robertgshaw2-redhat merged 2 commits into from
Mar 2, 2026
Merged

[All Reduce] Change default backend of Flashinfer All Reduce to trtllm #35793

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2ec5a0c
change default backend to trtllm
hjjq Mar 2, 2026
616af6f
link issue
hjjq Mar 2, 2026
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4 changes: 2 additions & 2 deletions vllm/envs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -168,7 +168,7 @@
VLLM_FLASHINFER_MOE_BACKEND: Literal["throughput", "latency", "masked_gemm"] = (
"latency"
)
VLLM_FLASHINFER_ALLREDUCE_BACKEND: Literal["auto", "trtllm", "mnnvl"] = "auto"
VLLM_FLASHINFER_ALLREDUCE_BACKEND: Literal["auto", "trtllm", "mnnvl"] = "trtllm"
VLLM_FLASHINFER_WORKSPACE_BUFFER_SIZE: int = 394 * 1024 * 1024
VLLM_XGRAMMAR_CACHE_MB: int = 0
VLLM_MSGPACK_ZERO_COPY_THRESHOLD: int = 256
Expand Down Expand Up @@ -1299,7 +1299,7 @@ def _get_or_set_default() -> str:
# But "mnnvl" backend does not support fuse with quantization.
"VLLM_FLASHINFER_ALLREDUCE_BACKEND": env_with_choices(
"VLLM_FLASHINFER_ALLREDUCE_BACKEND",
"auto",
"trtllm",
["auto", "trtllm", "mnnvl"],
),
# Control the workspace buffer size for the FlashInfer backend.
Expand Down