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Title: GH-126491: Lower heap size limit with faster marking by markshannon · Pull Request #127519 · python/cpython · GitHub

Open Graph Title: GH-126491: Lower heap size limit with faster marking by markshannon · Pull Request #127519 · python/cpython

X Title: GH-126491: Lower heap size limit with faster marking by markshannon · Pull Request #127519 · python/cpython

Description: With marking added to the cyclic GC (#127110) we spend a lot of the time in the GC forming transitive closures, both for marking and for the increments of the incremental GC. Unfortunately the current algorithm has a couple of mistakes in it. One harmful, one beneficial. The beneficial one is counting the initial mark twice. This helps because it reduces the cost of GC on heaps with little or no garbage The harmful one is allowing the amount of work done to grow in proportion to the heap size. These more or less cancel out. This PR deliberately counts marking as twice as effective as normal collection, but limits the amount of work done. To do so, we need to increase the typical amount of work done a bit. This has the advantage of limiting the amount of garbage to (roughly) 1/3 of the heap. This PR does two things: Speeds up the marking and increment creation phases Visits objects a bit faster to maintain a lower heap size. Issue: gh-126491

Open Graph Description: With marking added to the cyclic GC (#127110) we spend a lot of the time in the GC forming transitive closures, both for marking and for the increments of the incremental GC. Unfortunately the curr...

X Description: With marking added to the cyclic GC (#127110) we spend a lot of the time in the GC forming transitive closures, both for marking and for the increments of the incremental GC. Unfortunately the curr...

Opengraph URL: https://github.com/python/cpython/pull/127519

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Show all changes 24 commits https://github.com/python/cpython/pull/127519/files
3038a78 Faster marking of reachable objects markshannon Nov 9, 2024 https://github.com/python/cpython/pull/127519/commits/3038a78fc50757dce9ec2ae50a19708a7a9bed42
c024484 Handle more classes in fast marking markshannon Nov 10, 2024 https://github.com/python/cpython/pull/127519/commits/c024484826464a563bea4e379f23ad870c3b5c95
e8497ae Add support for asyn generators on fast path. Simplify counting markshannon Nov 11, 2024 https://github.com/python/cpython/pull/127519/commits/e8497ae4285efee06ee97bbb02bf851e9d7bfba3
4c1a6bc Check stackref before converting to PyObject * markshannon Nov 11, 2024 https://github.com/python/cpython/pull/127519/commits/4c1a6bcf5e30a4801e4cc6cfb8617fc944f1183b
6efb4c0 Rename stuff markshannon Nov 13, 2024 https://github.com/python/cpython/pull/127519/commits/6efb4c0e6c0e34e93900c49e622250fdb94b390f
b1c7ab0 Remove expand_region_transitively_reachable and use move_all_transiti… markshannon Nov 13, 2024 https://github.com/python/cpython/pull/127519/commits/b1c7ab03cbfa590d9bfd344606bf9a19ccac6f84
07f228b Merge branch 'main' into faster-marking markshannon Dec 2, 2024 https://github.com/python/cpython/pull/127519/commits/07f228ba7441d0c832768153ff9c7a0359a1f820
51ff78e Fix compiler warnings and linkage markshannon Dec 2, 2024 https://github.com/python/cpython/pull/127519/commits/51ff78e646b2f5d17a00464286e7145473d40041
df907b5 Fix another linkage issue markshannon Dec 2, 2024 https://github.com/python/cpython/pull/127519/commits/df907b5b777918bf7233ee310a6d97aa3dd86ff2
9ca64f5 Try 'extern' markshannon Dec 2, 2024 https://github.com/python/cpython/pull/127519/commits/9ca64f55e63e8425fc1075f296ce7dc63918fc62
bda13f4 Go back to PyAPI_FUNC and move functions together markshannon Dec 2, 2024 https://github.com/python/cpython/pull/127519/commits/bda13f44a28ea175ce6d3fea7f5118007f1298e7
d9d63c8 Use _Py_FALLTHROUGH markshannon Dec 2, 2024 https://github.com/python/cpython/pull/127519/commits/d9d63c8c249d306f3a0892278461985a0bf7061c
57b8820 Add necessary #ifndef Py_GIL_DISABLED markshannon Dec 2, 2024 https://github.com/python/cpython/pull/127519/commits/57b8820bd054d74435283277bd81c11e7a446ce5
a607059 Go back to using tp_traverse, but make traversal more efficient markshannon Dec 3, 2024 https://github.com/python/cpython/pull/127519/commits/a607059498f74138315ad6d628d9808fedd723b8
1545508 Tidy up markshannon Dec 3, 2024 https://github.com/python/cpython/pull/127519/commits/15455081f85f9cf119f439d09fae735636fe011e
a1a38c8 A bit more tidying up markshannon Dec 3, 2024 https://github.com/python/cpython/pull/127519/commits/a1a38c8da1e38fdb9392f37462f7f9d440d72ed3
68fc90b Move all work to do calculations to one place markshannon Dec 3, 2024 https://github.com/python/cpython/pull/127519/commits/68fc90bb74654f57a1fab692044daeb6f493adfd
8893cf5 Assume that increments are 50% garbage for work done calculation markshannon Dec 3, 2024 https://github.com/python/cpython/pull/127519/commits/8893cf53bec4645245f11707bc0b11704cb40494
ba20c7c Elaborate comment markshannon Dec 4, 2024 https://github.com/python/cpython/pull/127519/commits/ba20c7c990ff0dbb6af8ec27b5bb8780015f3edc
8262bf0 More tweaking of thresholds markshannon Dec 4, 2024 https://github.com/python/cpython/pull/127519/commits/8262bf010f85d3a4338d644513c1613ec8d1771f
3c2116e Do some algebra markshannon Dec 4, 2024 https://github.com/python/cpython/pull/127519/commits/3c2116edacadf0a5d81110529edb92459f3733f8
72d0284 Revert to 2M+I from 3M+I markshannon Dec 4, 2024 https://github.com/python/cpython/pull/127519/commits/72d0284492ff0adc8e15e01e8a819853f1d1a85a
0f182e2 Address review comments markshannon Dec 5, 2024 https://github.com/python/cpython/pull/127519/commits/0f182e2467a97b52335ca9274ade8b1ce0982445
d3c21bb Address review comments and clarify code a bit markshannon Dec 5, 2024 https://github.com/python/cpython/pull/127519/commits/d3c21bb57092428592b86af28246ed1221b002f5
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