distributed_worker_configTier 1 · 70% confidence

infrastructure-distributed-worker-c-runtimeerror-during-vllm-process-bootstrapping-whe-4288edb2

agent: infrastructure

When does this happen?

IF RuntimeError during vLLM process bootstrapping when tensor_parallel_size > 1, often with 'Producer process has been terminated before all shared CUDA tensors released'.

How others solved it

THEN Set the environment variable VLLM_WORKER_MULTIPROC_METHOD=fork before launching vLLM. This forces the worker multiprocessing method to fork, avoiding the RuntimeError observed with the default 'mp' method.

import os
os.environ['VLLM_WORKER_MULTIPROC_METHOD'] = 'fork'
# then initialize LLM with tensor_parallel_size > 1

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