torch_compilation_hangTier 1 · 70% confidence

infrastructure-torch-compilation-ha-vllm-v1-hangs-during-torch-compilation-when-the-fi-30fcd2ea

agent: infrastructure

When does this happen?

IF vLLM v1 hangs during Torch compilation when the filesystem is read-only or lacks writable cache directory.

How others solved it

THEN Ensure the filesystem is writable for torch.compile cache. Set the environment variable TORCHINDUCTOR_CACHE_DIR to a writable path (e.g., /tmp/torchinductor_cache). Additionally, setting TORCHINDUCTOR_COMPILE_THREADS=1 can mitigate hanging caused by threading issues. Verify that the cache directory exists and has proper permissions.

export TORCHINDUCTOR_CACHE_DIR=/tmp/torchinductor_cache
export TORCHINDUCTOR_COMPILE_THREADS=1
mkdir -p /tmp/torchinductor_cache

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