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Title: GH-93533: Shrink the `LOAD_ATTR` caches by brandtbucher · Pull Request #103014 · python/cpython · GitHub

Open Graph Title: GH-93533: Shrink the `LOAD_ATTR` caches by brandtbucher · Pull Request #103014 · python/cpython

X Title: GH-93533: Shrink the `LOAD_ATTR` caches by brandtbucher · Pull Request #103014 · python/cpython

Description: This adds a fixed array of cached methods to the PyTypeObject struct. This approach saves memory if there are ~23x more LOAD_ATTR sites than there are types. A size of 16 was chosen because: A siz...

Open Graph Description: This adds a fixed array of cached methods to the PyTypeObject struct. This approach saves memory if there are ~23x more LOAD_ATTR sites than there are types. A size of 16 was chosen because: A siz...

X Description: This adds a fixed array of cached methods to the PyTypeObject struct. This approach saves memory if there are ~23x more LOAD_ATTR sites than there are types. A size of 16 was chosen because: A siz...

Opengraph URL: https://github.com/python/cpython/pull/103014

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1% slowerhttps://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20230323-3.12.0a6%2B-bde6bec/bm-20230323-linux-x86_64-brandtbucher-type_cache_fixed-3.12.0a6%2B-bde6bec-vs-base.png
81.0% LOAD_ATTR hit ratehttps://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20230323-3.12.0a6%2B-bde6bec/bm-20230323-azure-x86_64-brandtbucher-type_cache_fixed-3.12.0a6%2B-bde6bec-pystats.md
0% fasterhttps://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20230323-3.12.0a6%2B-212046c/bm-20230323-linux-x86_64-brandtbucher-type_cache_fixed-3.12.0a6%2B-212046c-vs-base.png
82.2% LOAD_ATTR hit ratehttps://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20230323-3.12.0a6%2B-212046c/bm-20230323-azure-x86_64-brandtbucher-type_cache_fixed-3.12.0a6%2B-212046c-pystats.md
0% fasterhttps://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20230323-3.12.0a6%2B-cc70763/bm-20230323-linux-x86_64-brandtbucher-type_cache_fixed_lar-3.12.0a6%2B-cc70763-vs-base.png
82.6% LOAD_ATTR hit ratehttps://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20230323-3.12.0a6%2B-cc70763/bm-20230323-azure-x86_64-brandtbucher-type_cache_fixed_lar-3.12.0a6%2B-cc70763-pystats.md
1% slowerhttps://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20230322-3.12.0a6%2B-c87e8bd/bm-20230322-linux-x86_64-brandtbucher-type_cache-3.12.0a6%2B-c87e8bd-vs-base.png
The inline cache for LOAD_ATTR is too large. #93533https://github.com/python/cpython/issues/93533
Please reload this pagehttps://github.com/python/cpython/pull/103014
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March 22, 2023 18:29https://github.com/python/cpython/pull/103014#commits-pushed-c87e8bd
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Stick a small, resizable cache on all typeshttps://github.com/python/cpython/pull/103014/commits/c87e8bd0f377c049f9f8448b2f047cf4798dc6df
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Try a bigger starting cache size (8 instead of 1)https://github.com/python/cpython/pull/103014/commits/0e21f47cc8f6943ee7f53bee5b5e43faec814e03
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Try a fixed cache sizehttps://github.com/python/cpython/pull/103014/commits/bde6bec49a139ad2ea6f78790c9b9cd0889777af
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Bump the size to 16https://github.com/python/cpython/pull/103014/commits/212046ce2f6fa3e76a46d84cba3fdf81d933cc5c
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Merge branch 'main' into type-cache-fixedhttps://github.com/python/cpython/pull/103014/commits/6934d55172b95e0d862d00ba0dcf90c3bbeca25f
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