verifiedhigh · 0.85updated 2026-10-03

NCCL issue 418: Multiple MPI ranks in the same GPU using Nvidia Multiprocess Service

repo

Fields

sources/mgpu-nccl-418-duplicate-device-mps

URL

https://github.com/NVIDIA/nccl/issues/418

Publisher

NVIDIA/nccl

Kind

repo

Published

2020-11-11

Accessed

2026-10-03

notes

Captures the exact runtime signatures: 'NCCL WARN Duplicate GPU detected : rank 0 and rank 1 both on CUDA device ...' and "NCCL error a.cpp:106 'invalid usage'" from ncclCommInitRank.

Notes

Captures the exact runtime signatures: 'NCCL WARN Duplicate GPU detected : rank 0 and rank 1 both on CUDA device ...' and "NCCL error a.cpp:106 'invalid usage'" from ncclCommInitRank.

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