Yaroslav <flower.moor@gmail.com> added the comment: As I can see here https://github.com/python/devguide/blob/master/garbage_collector.rst#collect...

the GC only triggers a full collection of the oldest generation if the ratio long_lived_pending / long_lived_total is above a given value (hardwired to 25%)

But in the python docs here https://docs.python.org/3.10/library/gc.html#gc.set_threshold

When the number of allocations minus the number of deallocations exceeds threshold0, collection starts. Initially only generation 0 is examined. If generation 0 has been examined more than threshold1 times since generation 1 has been examined, then generation 1 is examined as well. Similarly, threshold2 controls the number of collections of generation 1 before collecting generation 2.

As I can see here: https://github.com/python/cpython/blob/master/Modules/gcmodule.c#L1456 the first one is correct. We should probably fix python docs accordingly. ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41455> _______________________________________

Yaroslav <flower.moor@gmail.com> added the comment: Here's opened PR. https://github.com/python/cpython/pull/21703 ---------- nosy: -python-dev _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41455> _______________________________________

Change by Terry J. Reedy <tjreedy@udel.edu>: ---------- nosy: +pablogsal, pitrou _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41455> _______________________________________

Change by miss-islington <mariatta.wijaya+miss-islington@gmail.com>: ---------- nosy: +miss-islington nosy_count: 4.0 -> 5.0 pull_requests: +20928 pull_request: https://github.com/python/cpython/pull/21786 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41455> _______________________________________

Change by miss-islington <mariatta.wijaya+miss-islington@gmail.com>: ---------- pull_requests: +20930 pull_request: https://github.com/python/cpython/pull/21788 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41455> _______________________________________

miss-islington <mariatta.wijaya+miss-islington@gmail.com> added the comment: New changeset 103ce3debf07a48e79319acd0890be0c53e64fff by Miss Islington (bot) in branch '3.9': bpo-41455: Provide a link to how the third generation is collected in the GC docs (GH-21703) https://github.com/python/cpython/commit/103ce3debf07a48e79319acd0890be0c53e... ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41455> _______________________________________

Ned Deily <nad@python.org> added the comment: New changeset f3b6f3cd9ac6931ae346cf298fae7b691d5656bb by Miss Islington (bot) in branch '3.7': bpo-41455: Provide a link to how the third generation is collected in the GC docs (GH-21703) (GH-21788) https://github.com/python/cpython/commit/f3b6f3cd9ac6931ae346cf298fae7b691d5... ---------- nosy: +ned.deily _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41455> _______________________________________