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P2P intra-node tput #581

@YangZhou1997

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@YangZhou1997

The intra-node p2p tput using the copy engine is still low, compared to NCCL/RCCL's SM copy. To reproduce: torchrun --nproc_per_node=8 benchmark_uccl_collective.py --ring. Is this inherent to the copy engine?

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