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NCCL debug with benchmark_cuda #317

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insanum opened this issue Feb 9, 2022 · 1 comment
Open

NCCL debug with benchmark_cuda #317

insanum opened this issue Feb 9, 2022 · 1 comment

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@insanum
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insanum commented Feb 9, 2022

I'm running benchmark_cuda with MPI and am setting various NCCL environment variables on the command line. When I specify -x NCCL_DEBUG=INFO I don't see any debug info being dumped on the console. Any ideas?
@insanum
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insanum commented Feb 9, 2022

Possibly answering my own question I think I know what is going on. gloo isn't using NCCL to create all the transport paths between nodes and instead just using the broadcast/allreduce kernel code from NCCL to run on the GPUs.

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