pytorch

5d51b639 - Use Blocking Wait if both Blocking Wait and Async Error Handling Are Set (#47926)

Use Blocking Wait if both Blocking Wait and Async Error Handling Are Set (#47926) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/47926 Given that we're soon enabling async error handling in PET, we should make the behavior explicit when users have set NCCL_BLOCKING_WAIT in their own code while also using PET. This PR essentially gives blocking wait precedence (for now). This way the blast radius of the PET change is smaller, while we continue working with blocking wait users and discussing whether moving to async error handling may be a good fit. ghstack-source-id: 116553583 Test Plan: Simple FBL run/CI Reviewed By: jiayisuse Differential Revision: D24928149 fbshipit-source-id: d42c038ad44607feb3d46dd65925237c564ff7a3