fix ProcessGroupGlooTest (#31255)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31255
This test had 2 issues. A timeout would occasionally happen due to a timeout of 50ms, and CUDA could would get compiled and run on CPU, leading to errors. This PR fixes those issues.
Differential Revision: D19028231
fbshipit-source-id: e50752228affe0021e7c0caa83bce78d76473759
