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Title: gh-115999: Specialize `LOAD_GLOBAL` in free-threaded builds by mpage · Pull Request #126607 · python/cpython · GitHub

Open Graph Title: gh-115999: Specialize `LOAD_GLOBAL` in free-threaded builds by mpage · Pull Request #126607 · python/cpython

X Title: gh-115999: Specialize `LOAD_GLOBAL` in free-threaded builds by mpage · Pull Request #126607 · python/cpython

Description: Enable specialization of LOAD_GLOBAL in free-threaded builds. Thread-safety of specialization in free-threaded builds is provided by the following: A critical section is held on both the globals and builtins objects during specialization. This ensures we get an atomic view of both builtins and globals during specialization. Generation of new keys versions is made atomic in free-threaded builds. Existing helpers are used to atomically modify the opcode. Thread-safety of specialized instructions in free-threaded builds is provided by the following: Relaxed atomics are used when loading and storing dict keys versions. This avoids potential data races as the dict keys versions are read without holding the dictionary's per-object lock in version guards. Dicts keys objects are passed from keys version guards to the downstream uops. This ensures that we are loading from the correct offset in the keys object. Once a unicode key has been stored in a keys object for a combined dictionary in free-threaded builds, the offset that it is stored in will never be reused for a different key. Once the version guard passes, we know that we are reading from the correct offset. The dictionary read fast-path is used to read values from the dictionary once we know the correct offset. Performance-wise, this looks like a 3-4% improvement on free-threaded builds on pyperformance. Issue: gh-115999

Open Graph Description: Enable specialization of LOAD_GLOBAL in free-threaded builds. Thread-safety of specialization in free-threaded builds is provided by the following: A critical section is held on both the globals a...

X Description: Enable specialization of LOAD_GLOBAL in free-threaded builds. Thread-safety of specialization in free-threaded builds is provided by the following: A critical section is held on both the globals a...

Opengraph URL: https://github.com/python/cpython/pull/126607

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05af6b2 Make specialization of LOAD_GLOBAL thread-safe mpage Sep 25, 2024 https://github.com/python/cpython/pull/126607/commits/05af6b2df99b787c9dd04bda233cb94de95fe727
5af633c _Py_GetExecutor needs a CS in free-threaded builds mpage Oct 28, 2024 https://github.com/python/cpython/pull/126607/commits/5af633c7a74f791a1a373b3d78be7d2d5e602f1b
7b3df6f Undo workaround for cases generator bug mpage Nov 8, 2024 https://github.com/python/cpython/pull/126607/commits/7b3df6f883e2f77bd14170cbf055fa222109e8ff
8f6239d Fix unused function warning mpage Nov 8, 2024 https://github.com/python/cpython/pull/126607/commits/8f6239d2eebcd6cfc65a49153b62ea26bfff2cb2
49ec70a Double check that keys are still valid mpage Nov 8, 2024 https://github.com/python/cpython/pull/126607/commits/49ec70a6ffe358fce6c8725298ee6a99c30ad46b
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72519ca Fix linkage mpage Nov 9, 2024 https://github.com/python/cpython/pull/126607/commits/72519ca3ac77dbcb2cc7b4a92c943fbcdc2ee7de
d55397b `_Py_TryIncrefCompare` can't escape mpage Nov 9, 2024 https://github.com/python/cpython/pull/126607/commits/d55397b22c34b430a7d342cbaeaa55b8216fbc45
ad9a9d0 Use atomics for setting keys version for split keys mpage Nov 16, 2024 https://github.com/python/cpython/pull/126607/commits/ad9a9d025a8232487586b222cb17b804e713bb3b
5b7e65c Ensure dict is shared when assigning keys version mpage Nov 16, 2024 https://github.com/python/cpython/pull/126607/commits/5b7e65c2a237d2ddc4d3c89887608de27636070d
129300b Don't check keys after loading them mpage Nov 17, 2024 https://github.com/python/cpython/pull/126607/commits/129300b45cdf52a5f1e024fcfbecc5a5a5d9c8f5
3440429 Support deferred refcounting mpage Nov 17, 2024 https://github.com/python/cpython/pull/126607/commits/34404291a63239661d98bce768ca7f35764d6427
01041a4 Merge branch 'main' into gh-115999-tlbc-load-global mpage Nov 18, 2024 https://github.com/python/cpython/pull/126607/commits/01041a40463ff44a155824436d1ddc4f78d45bf8
bfe1c93 Fix param name mpage Nov 19, 2024 https://github.com/python/cpython/pull/126607/commits/bfe1c93285ca290e2f2eef49ae3cf3f013b94e3c
d5258e0 Always mark keys shared mpage Nov 19, 2024 https://github.com/python/cpython/pull/126607/commits/d5258e05b4153112209a76e39e1acf28ec2f58c5
852be38 Update comment mpage Nov 19, 2024 https://github.com/python/cpython/pull/126607/commits/852be3891639e1b817da9794debf75f81fd2339d
e11e0ae Merge branch 'main' into gh-115999-tlbc-load-global mpage Nov 20, 2024 https://github.com/python/cpython/pull/126607/commits/e11e0aeb5ce51d42b31d059991eb909413c50c74
01f4143 Don't pass reason to unspecialize mpage Nov 20, 2024 https://github.com/python/cpython/pull/126607/commits/01f41432db65b4b157c7f8979328d02ea8c967db
b922dfe Merge branch 'main' into gh-115999-tlbc-load-global mpage Nov 21, 2024 https://github.com/python/cpython/pull/126607/commits/b922dfe2eabc417fc41a5d7c70ed70f2c57b4bf4
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