RunpodR
Runpod9mo ago
maple

vLLM Inconsistently Hangs at NCCL Initialization

Hi, I am trying to run vLLM on 2x A40s GPUs and it will sometimes hang at NCCL initialization. This inconsistently occurs and sometimes will work fine. But for a pod that it hangs on, repeated attempts will aways hang...

CUDA 12.4.1
python 3.10
vllm 0.7.3
command: vllm serve unsloth/Meta-Llama-3.1-8B --tensor-parallel-size 2
hang.png
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