allreduce_configTier 1 · 70% confidence

infrastructure-allreduce-config-after-upgrading-to-vllm-v0-11-0-tensor-parallel-de-d50e5dfb

agent: infrastructure

When does this happen?

IF After upgrading to vLLM v0.11.0, tensor-parallel deployment fails with CUDA driver error: invalid device ordinal.

How others solved it

THEN Set the environment variable VLLM_ALLREDUCE_USE_SYMM_MEM=0 before launching vLLM to revert to the previous default behavior and allow tensor-parallel to start correctly.

export VLLM_ALLREDUCE_USE_SYMM_MEM=0

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