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gh-129201: Use prefetch in GC mark alive phase. #129203

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gh-129201: Use prefetch in GC mark alive phase. #129203

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1dd4bb6
Use prefetch in GC mark alive phase.
nascheme Jan 14, 2025
1b4e8c3
Add prefetch() macro that might work on MSVC.
nascheme Jan 22, 2025
9fbfd43
Improve portability of prefetch macros.
nascheme Jan 23, 2025
7f51104
Implement "spans" for marking phase.
nascheme Jan 24, 2025
041b2e4
Fix bug in "span" enqueue logic.
nascheme Jan 24, 2025
86a5c95
Add some asserts, minor code cleanup.
nascheme Jan 27, 2025
62bace2
Merge branch 'origin/main' into gh-129201-gc-mark-prefetch
nascheme Jan 30, 2025
e12dd2e
Fix bug in tuple untrack logic.
nascheme Jan 31, 2025
15ada78
Improve "prefetch" instruction macros.
nascheme Feb 1, 2025
abfc49a
Use of prefetching conditionally.
nascheme Jan 31, 2025
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5 changes: 5 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-01-22-14-22-34.gh-issue-129201.wiZzEb.rst
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The free-threaded version of the cyclic garbage collector has been optimized to
conditionally use CPU prefetch instructions during the collection. This can
reduce collection times by making it more likely that data is in the CPU cache
when it is needed. The prefetch instructions are enabled if the number of
long-lived objects (objects surviving a full collection) exceeds a threshold.
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