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hugovk merged 12 commits into from
Dec 17, 2025
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gh-139038: Add JIT What's New for 3.15 #142845

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Add What's New for 3.15 JIT
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@Fidget-Spinner
Fidget-Spinner committed Dec 16, 2025
commit f133047dcab5e4fe01c5cdd68e8d517702a741f1
9 changes: 5 additions & 4 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -860,10 +860,11 @@ Upgraded JIT Compiler

Results from the pyperformance benchmark suite report
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`3-4% <https://github.com/facebookexperimental/free-threading-benchmarking/blob/main/results/bm-20251214-3.15.0a2%2B-6cddf04-JIT/bm-20251214-vultr-x86_64-python-6cddf04344a1e8ca9df5-3.15.0a2%2B-6cddf04-vs-base.svg>`_
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geometric mean performance for the JIT over the standard CPython interpreter built with
all optimizations enabled. The speedups for JIT builds versus no JIT builds
range from roughly 20% slowdown to over 100% speedup (ignoring the
``unpack_sequence`` microbenchmark) on x86-64 Linux and AArch64 macOS systems.
geometric mean performance improvement for the JIT over the standard CPython
interpreter built with all optimizations enabled. The speedups for JIT
builds versus no JIT builds range from roughly 20% slowdown to over
100% speedup (ignoring the ``unpack_sequence`` microbenchmark) on
x86-64 Linux and AArch64 macOS systems.

.. attention::
These results are not yet final.
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