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[GH-ISSUE #414] Can DeepEP run parallel with NCCL collective communication tasks? #279
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Originally created by @arminzhu on GitHub (Sep 17, 2025).
Original GitHub issue: https://github.com/deepseek-ai/DeepEP/issues/414
I want to use DeepEP and NCCL simultaneously. I encounter a time out error, I want to confirm whether there will be any conflict when both of them are used simultaneously.
@sphish commented on GitHub (Sep 24, 2025):
If each rank executes DeepEP and NCCL communications in the same order, there should be no conflicts.
@arminzhu commented on GitHub (Sep 29, 2025):
Very thanks, sir. I will close this issue.
@jiangjiang-coder66 commented on GitHub (Nov 14, 2025):
Hi @sphish , I occasionally encounter timeout errors(NCCL error) when using NCCL overlap low_latency_dispatch. I am confused about each rank executes DeepEP and NCCL communications in the same order, What is the reason for this restriction?