Better graceful shutdown for KeyboardInterrupt #19976
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awaelchli
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justusschock
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #19976 +/- ##
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- Coverage 84% 59% -25%
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Files 426 421 -5
Lines 35284 35195 -89
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- Hits 29620 20785 -8835
- Misses 5664 14410 +8746 |
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awaelchli
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Hello @awaelchli, I recently upgraded Lightning and discovered this change. Before, we were able to stop the training while not stopping the rest of the program. I thought it was nice to be able to stop the training in a notebook and then continue experiments. Of course, not useful for training a "real" model, but it's pretty nice when exploring and testing new things. Is there another reason for such a change (apart from better stopping the processes)? Or maybe I'm missing something? Thanks for your help! |
What does this PR do?
When the user sends KeyboardInterrupt (Ctrl+C), Lightning runs shutdown logic. However, it does not guarantee that all processes get stopped. Users sometimes get hanging zombie processes. Furthermore, our logic does not play well when the user spams Ctrl+C repeatedly. This PR addresses both concerns.
Video Demo:
https://www.loom.com/share/a7e105baab5a493b89412434abb7c7fc?sid=1ab5b6b4-f9a1-46a1-888d-726336c5f360
📚 Documentation preview 📚: https://pytorch-lightning--19976.org.readthedocs.build/en/19976/