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bpo-37029: keep usable_arenas in sorted order without searching #13612

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Merged
tim-one merged 5 commits into from
Jun 1, 2019
Merged

bpo-37029: keep usable_arenas in sorted order without searching #13612

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c691a69
Issue 37029: first stab at removing all searching to keep usable_arenas
tim-one May 28, 2019
f4a60e8
📜🤖 Added by blurb_it.
blurb-it[bot] May 28, 2019
efe1e63
Beefed up an assert; added the BPO number to a comment.
tim-one May 28, 2019
0b36d42
Merge branch 'remove-arena-search' of https://github.com/tim-one/cpyt…
tim-one May 28, 2019
0463a7d
And added one more assert.
tim-one May 28, 2019
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2019-05-28-17-02-46.bpo-37029.MxpgfJ.rst
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Freeing a great many small objects could take time quadratic in the number of arenas, due to using linear search to keep ``obmalloc.c``'s list of usable arenas sorted by order of number of free memory pools. This is accomplished without search now, leaving the worst-case time linear in the number of arenas. For programs where this quite visibly matters (typically with more than 100 thousand small objects alive simultaneously), this can greatly reduce the time needed to release their memory.