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[3.14] GH-139951: Fix major GC performance regression. Backport of GH-140262 by markshannon · Pull Request #140447 · python/cpython · GitHub

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[3.14] GH-139951: Fix major GC performance regression. Backport of GH-140262 - #140447

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markshannon merged 1 commit into
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Oct 23, 2025
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[3.14] GH-139951: Fix major GC performance regression. Backport of GH-140262#140447
markshannon merged 1 commit into
python:3.14from
faster-cpython:backport-140262

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markshannon commented Oct 22, 2025 •
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  • Count number of actually tracked objects, instead of trackable objects. This ensures that untracking tuples has the desired effect of reducing GC overhead
  • Do not track most untrackable tuples during creation. This prevents large numbers of small tuples causing execessive GCs.

Fix major GC performance regression
828e314 
* Count number of actually tracked objects, instead of trackable objects. This ensures that untracking tuples has the desired effect of reducing GC overhead
* Do not track most untrackable tuples during creation. This prevents large numbers of small tuples causing execessive GCs.
bedevere-app Bot mentioned this pull request Oct 22, 2025
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colesbury commented Oct 22, 2025

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FYI, this and #140423 look like nearly identical PRs.

sergey-miryanov approved these changes Oct 22, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

LGTM

markshannon mentioned this pull request Oct 23, 2025
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markshannon merged commit d1a434f into python:3.14 Oct 23, 2025
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gpshead mentioned this pull request Nov 28, 2025
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