Support bitwise allreduce in NCCL communicator #9300
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trivialfis
approved these changes
Jun 14, 2023
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Apologies for the oversight, the no_sync is a CTK-12 feature. |
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Switched to use |
trivialfis
reviewed
Jun 16, 2023
| nccl_unique_id_ = GetUniqueId(); | ||
| dh::safe_cuda(cudaSetDevice(device_ordinal_)); | ||
| dh::safe_nccl(ncclCommInitRank(&nccl_comm_, world, nccl_unique_id_, rank)); | ||
| dh::safe_cuda(cudaStreamCreate(&cuda_stream_)); |
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Just a side note, there's dh::CUDAStream, which is a RAII version of async stream.
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Use
AllGatherto collect all the data first, then do the bitwise allreduce locally.