pytorch

dbc354b2 - Mitigate flaky test_ops_fwd_gradients on macOS (#89410)

Mitigate flaky test_ops_fwd_gradients on macOS (#89410) This has been flaky on macOS for a while ([hud](https://hud.pytorch.org/failure/RuntimeError%3A%20test_ops_fwd_gradients%20failed)) and I can reproduce this locally. The issue was raised by https://github.com/pytorch/pytorch/issues/66033 and it seems to point to macos itself https://github.com/graphia-app/graphia/issues/33. So switching to single thread when running `test_ops_fwd_gradients` on macOS as a mitigation for the flaky tests. ### Testing `pytest test_ops_fwd_gradients.py -k test_fn_fwgrad_bwgrad -vv --flake-finder` to run all `test_fn_fwgrad_bwgrad` tests 50 times to make sure they all pass (no flaky anymore) https://hud.pytorch.org/tests shows that `test_ops_fwd_gradients` on macOS takes about 15m to finish or 8 minute if using 2 shards like in the test. There is no obvious difference in the test duration: ``` 2022-11-21T21:34:18.6078080Z Running test_ops_fwd_gradients ... [2022-11-21 21:34:18.600663] 2022-11-21T21:34:21.6805770Z Executing ['/Users/runner/work/_temp/conda_environment_3517515737/bin/python', '-bb', 'test_ops_fwd_gradients.py', '-v', '--use-pytest', '-vv', '-rfEX', '-x', '--reruns=2', '--shard-id=0', '--num-shards=2', '-k=not _linalg_cholesky_', '--import-slow-tests', '--import-disabled-tests'] ... [2022-11-21 21:34:21.680156] 2022-11-21T21:34:21.6806380Z Ignoring disabled issues: [] 2022-11-21T21:34:21.6815250Z Executing ['/Users/runner/work/_temp/conda_environment_3517515737/bin/python', '-bb', 'test_ops_fwd_gradients.py', '-v', '--use-pytest', '-vv', '-rfEX', '-x', '--reruns=2', '--shard-id=1', '--num-shards=2', '-k=not _linalg_cholesky_', '--import-slow-tests', '--import-disabled-tests'] ... [2022-11-21 21:34:21.681174] 2022-11-21T21:34:21.6815830Z Ignoring disabled issues: [] ..... 2022-11-21T21:40:42.2422700Z =============================== warnings summary =============================== ..... 2022-11-21T21:40:42.2424670Z - generated xml file: /Users/runner/work/pytorch/pytorch/test/test-reports/python-pytest/test_ops_fwd_gradients/test_ops_fwd_gradients-47b619449ea7db1f.xml - 2022-11-21T21:40:42.2424850Z = 831 passed, 596 skipped, 5 deselected, 17 xfailed, 1 warning in 374.54s (0:06:14) = ..... 2022-11-21T21:42:00.1923310Z =============================== warnings summary =============================== ..... 2022-11-21T21:42:00.1925370Z - generated xml file: /Users/runner/work/pytorch/pytorch/test/test-reports/python-pytest/test_ops_fwd_gradients/test_ops_fwd_gradients-d24ee6419a602a6e.xml - 2022-11-21T21:42:00.1925540Z = 828 passed, 603 skipped, 7 deselected, 20 xfailed, 1 warning in 452.94s (0:07:32) = .... 2022-11-21T21:42:09.9035670Z FINISHED PRINTING LOG FILE of test_ops_fwd_gradients (/Users/runner/work/pytorch/pytorch/test/test-reports/test_ops_fwd_gradients_ha_3rfhb) ``` Pull Request resolved: https://github.com/pytorch/pytorch/pull/89410 Approved by: https://github.com/soulitzer