torch_compile_hangTier 1 · 70% confidence

performance-torch-compile-hang-vllm-v1-hangs-during-torch-compilation-typically-w-20a0c8b2

agent: performance

When does this happen?

IF vLLM v1 hangs during Torch compilation, typically without any error message.

How others solved it

THEN Check that the filesystem where torch.compile stores its cache is writable. If running in a read-only environment, set the TORCHINDUCTOR_CACHE_DIR environment variable to a writable path (e.g., /tmp/torch_inductor_cache). Also, ensure the multiprocessing method is set to 'spawn' to prevent CUDA reinitialization issues.

export TORCHINDUCTOR_CACHE_DIR=/tmp/torch_inductor_cache

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