Comments (4)
nluehr
commented on July 17, 2024
NCCL does support multi-threaded control. In fact, calling ncclCommInitRank() from each thread, you can even perform the communicator initialization in multi-threaded mode. The code above contains only a couple of nccl calls, neither of which can deadlock. The hang most likely occurs during the comm initialization step. Can you include the listing of main?
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ladiemon
commented on July 17, 2024
I have similar dead lock issue when I called ncclCommInitRank from multiple threads.
And I found some threads stuck in syncRingDirect and closeGather.
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nluehr
commented on July 17, 2024
ladiemon, the latest commit (dba3ec9) should fix the deadlock in ncclCommInitRank.
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sjeaugey
commented on July 17, 2024
Closing old bug.
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