env_override.py

# SPDX-License-Identifier: Apache-2.0
import os

import torch

# set some common config/environment variables that should be set
# for all processes created by vllm and all processes
# that interact with vllm workers.
# they are executed whenever `import vllm` is called.

# see https://github.com/NVIDIA/nccl/issues/1234
os.environ['NCCL_CUMEM_ENABLE'] = '0'

# see https://github.com/vllm-project/vllm/pull/15951
# it avoids unintentional cuda initialization from torch.cuda.is_available()
os.environ['PYTORCH_NVML_BASED_CUDA_CHECK'] = '1'

# see https://github.com/vllm-project/vllm/issues/10480
os.environ['TORCHINDUCTOR_COMPILE_THREADS'] = '1'
# see https://github.com/vllm-project/vllm/issues/10619
# torch._inductor.config.compile_threads = 1