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trunk/b1322a6528cb566a27119128a1a2a30e744884a4: Avoid multiprocess tests hanging forever. (#171972)

PyTorch Releasesby FlamefireApril 1, 20261 min read0 views
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<p>When a child process exits before filling the completion queue the parent process will wait forever for it to be filled. As the reason for the termination can be anything check if the process is still alive after a given timeout.</p> <p>If it is not alive and the queue is still empty this indicates such a situation and we handle it like an exception returned by the subprocess.</p> <p>See <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="3785636718" data-permission-text="Title is private" data-url="https://github.com/pytorch/pytorch/issues/171796" data-hovercard-type="issue" data-hovercard-url="/pytorch/pytorch/issues/171796/hovercard" href="https://github.com/pytorch/pytorch/issues/171796">#171796</a></p> <p>Pull Request resolved: <a class="issue-link j

When a child process exits before filling the completion queue the parent process will wait forever for it to be filled. As the reason for the termination can be anything check if the process is still alive after a given timeout.

If it is not alive and the queue is still empty this indicates such a situation and we handle it like an exception returned by the subprocess.

See #171796

Pull Request resolved: https://github.com/pytorch/pytorch/pull/171972 Approved by: https://github.com/sanketpurandare`

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