pytorch

574f9af1 - [NCCL] Add option to run NCCL on high priority cuda stream (#43796)

[NCCL] Add option to run NCCL on high priority cuda stream (#43796) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/43796 This diff adds an option for the process group NCCL backend to pick high priority cuda streams. Test Plan: waitforsandcastle Reviewed By: jiayisuse Differential Revision: D23404286 fbshipit-source-id: b79ae097b7cd945a26e8ba1dd13ad3147ac790eb