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Question about using nccl group #1535

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chenhongyu2048 opened this issue Dec 7, 2024 · 1 comment
Open

Question about using nccl group #1535

chenhongyu2048 opened this issue Dec 7, 2024 · 1 comment

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@chenhongyu2048
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Hello everybody, I have such a situation and I need some help.

GPU0 starts a ncclgroup with many ncclsend, and GPU1 will launch multiple corresponding ncclrecv.
I wonder if the ncclrecvs on GPU1 will complete at close to the same time? Because ncclsend kernels on GPU0 are in a group.
@chenhongyu2048
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In my experiments, the results showed that ncclrecv would be done one by one (which was exactly what I was hoping for).
But I still wonder why, because it seems to be different from the explanation in #1028

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