Re-introduce GC freeze hack into parallel checking#21302
Merged
ilevkivskyi merged 1 commit intopython:masterfrom Apr 24, 2026
Merged
Re-introduce GC freeze hack into parallel checking#21302ilevkivskyi merged 1 commit intopython:masterfrom
ilevkivskyi merged 1 commit intopython:masterfrom
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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I can try this out tomorrow. |
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This was maybe ~3% faster on 3.12 (macOS) when type checking the big internal codebase, with roughly flat memory usage. 3.14.0 was a bit faster still, but I don't have a baseline to compare to. Performance and memory on Linux (3.12) was also fine. This looks solid to me. |
JukkaL
approved these changes
Apr 24, 2026
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This gives around 4-5% speed improvement on self-check while I don't see any visible change in memory use. I also process implementations one by one, this should allow freeing some memory a bit earlier, while I don't think this will have any effect on cache writing performance.
@JukkaL could you please run this on Dropbox code bases, while checking the memory use as well (preferably on both Mac and Linux)?