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Title: GH-148937: fix for free-threaded GC (RSS based defer) by nascheme · Pull Request #148940 · python/cpython · GitHub

Open Graph Title: GH-148937: fix for free-threaded GC (RSS based defer) by nascheme · Pull Request #148940 · python/cpython

X Title: GH-148937: fix for free-threaded GC (RSS based defer) by nascheme · Pull Request #148940 · python/cpython

Description: Asking the OS for the process memory usage doesn't work well given how mimalloc works. It does not promptly return memory to the OS and so the memory doesn't drop after cyclic trash is freed. Instead of asking the OS, use mimalloc APIs to compute how much memory is being used by all mimalloc arenas. We need to stop-the-world to do this but usually we can avoid doing a collection. So, from a performance perspective, this is worth it. Tim Peters has a GC stress tester that quickly shows the issue, linked below. Before this fix, when I run this, the process RSS quickly goes up to 1 GB. After the fix, the RSS stays at about 100 MB. For comparision, the 3.13 GC keeps RSS at about 200 MB. tim-gc-test.py Benchmark results Issue: gh-148937

Open Graph Description: Asking the OS for the process memory usage doesn't work well given how mimalloc works. It does not promptly return memory to the OS and so the memory doesn't drop after cyclic trash is fre...

X Description: Asking the OS for the process memory usage doesn't work well given how mimalloc works. It does not promptly return memory to the OS and so the memory doesn't drop after cyclic tras...

Opengraph URL: https://github.com/python/cpython/pull/148940

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ad5ed74 GH-148937: fix for free-threaded GC (RSS based defer) nascheme Apr 18, 2026 https://github.com/python/cpython/pull/148940/commits/ad5ed7425599aa5f48d2ce3296e6dc358d4e1d69
05d5050 Move gc_should_collect_mem_usage() call. nascheme Apr 24, 2026 https://github.com/python/cpython/pull/148940/commits/05d50506c42eb3349ca724700e2dabf827b9afb5
515e4c4 Add blurb. nascheme Apr 24, 2026 https://github.com/python/cpython/pull/148940/commits/515e4c4b73e05369dbe3d9371e81de1dbc853f69
7f654e1 Compute mimalloc memory usage based on full pages. nascheme Apr 29, 2026 https://github.com/python/cpython/pull/148940/commits/7f654e10f3e226678f8fdc1d986f0e42ebb1ca00
14b9696 Avoid warning of unused functions. nascheme Apr 30, 2026 https://github.com/python/cpython/pull/148940/commits/14b9696d31f7ae78a3ac1b9e33cbcc248d3be5d5
801737f Store full_page_bytes in mi_heap_t. nascheme May 2, 2026 https://github.com/python/cpython/pull/148940/commits/801737fd85a5fa919840fdcbdbb826fa5672b768
057f862 Use _mi_heap_main_get(). nascheme May 3, 2026 https://github.com/python/cpython/pull/148940/commits/057f8625f244420b707a09284fab52a938594e9c
847cba1 Merge remote-tracking branch 'origin/main' into ft-gc-threshold-fix-main nascheme May 3, 2026 https://github.com/python/cpython/pull/148940/commits/847cba1b6e09b398aa80399c0221135739dca295
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