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Why are not all SMs active when NCCL kernel and compute kernel overlap?[QUESTION] #1161

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yu-depend opened this issue Sep 27, 2024 · 0 comments
Open

Why are not all SMs active when NCCL kernel and compute kernel overlap?[QUESTION] #1161

yu-depend opened this issue Sep 27, 2024 · 0 comments

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@yu-depend
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When I run a single NCCL kernel ,the active SMs is 15%，and When I run a single compute kernel ,the active SMs is 100% ，but when I run the compute kernel and the NCCL kernel in parallel, so that they overlap，the active SMs is 85%, how to explain this？
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