pytorch

c8d76ff7 - Improve logging in ProcessGroupNCCL for debugging purposes. (#45780)

Improve logging in ProcessGroupNCCL for debugging purposes. (#45780) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/45780 When training jobs running with NCCL fail sometimes it is hard to debug the reason of the failure and our logging doesn't provide enough information at times to narrow down the issue. To improve the debugging experience, I've enhanced our logging to add a lot more information about what the ProcessGroup is doing under the hood. #Closes: https://github.com/pytorch/pytorch/issues/45310 Sample output: ``` > I1002 15:18:48.539551 1822062 ProcessGroupNCCL.cpp:528] [Rank 2] NCCL watchdog thread started! > I1002 15:18:48.539533 1821946 ProcessGroupNCCL.cpp:492] [Rank 2] ProcessGroupNCCL initialized with following options: > NCCL_ASYNC_ERROR_HANDLING: 0 > NCCL_BLOCKING_WAIT: 1 > TIMEOUT(ms): 1000 > USE_HIGH_PRIORITY_STREAM: 0 > I1002 15:18:51.080338 1822035 ProcessGroupNCCL.cpp:530] [Rank 1] NCCL watchdog thread terminated normally > I1002 15:18:52.161218 1821930 ProcessGroupNCCL.cpp:385] [Rank 0] Wrote aborted communicator id to store: NCCLABORTEDCOMM:a0e17500002836080c8384c50000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 > I1002 15:18:52.161238 1821930 ProcessGroupNCCL.cpp:388] [Rank 0] Caught collective operation timeout for work: WorkNCCL(OpType=ALLREDUCE, TensorShape=[10], Timeout(ms)=1000) > I1002 15:18:52.162120 1821957 ProcessGroupNCCL.cpp:530] [Rank 0] NCCL watchdog thread terminated normally > I1002 15:18:58.539937 1822062 ProcessGroupNCCL.cpp:649] [Rank 2] Found key in store: NCCLABORTEDCOMM:a0e17500002836080c8384c50000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, from rank: 0, aborting appropriate communicators > I1002 15:19:34.740937 1822062 ProcessGroupNCCL.cpp:662] [Rank 2] Aborted communicators for key in store: NCCLABORTEDCOMM:a0e17500002836080c8384c50000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 > I1002 15:19:34.741678 1822062 ProcessGroupNCCL.cpp:530] [Rank 2] NCCL watchdog thread terminated normally ``` ghstack-source-id: 113731163 Test Plan: waitforbuildbot Reviewed By: osalpekar Differential Revision: D24093032 fbshipit-source-id: 240b03562f8ccccc3d872538f5e331df598ceca7