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gh-115999: Note Python 3.14 free-threaded changes in What's New #131285

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Merged
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May 10, 2025
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gh-115999: Note Python 3.14 free-threaded changes in What's New #131285

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gh-11599: Update whats news for free-threaded 3.14
corona10 Mar 15, 2025
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Add Ken Jin because he involves early design
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Update Doc/whatsnew/3.14.rst
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19 changes: 19 additions & 0 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -68,6 +68,7 @@ Summary -- release highlights
* :ref:`PEP 741: Python Configuration C API <whatsnew314-pep741>`
* :ref:`PEP 761: Discontinuation of PGP signatures <whatsnew314-pep761>`
* :ref:`A new type of interpreter <whatsnew314-tail-call>`
* :ref:`Free-threaded CPython <whatsnew314-free-threaded-cpython>`


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Expand Down Expand Up @@ -311,6 +312,24 @@ For further information on how to build Python, see
(Contributed by Ken Jin in :gh:`128563`, with ideas on how to implement this
in CPython by Mark Shannon, Garrett Gu, Haoran Xu, and Josh Haberman.)

.. _whatsnew314-free-threaded-cpython:

Free-threaded CPython
---------------------

Free-threaded CPython now supports :pep:`659` which is known
as the specializing adaptive interpreter, the execution mechanisms is almost same
as the default build, but at free-threaded CPython build, each thread maintains
a thread-local copy of specialized bytecode.

With this change, the free-threaded CPython build achieve better performance
and 10-15% slower than the default build.

This work was done by many contributors, Matt Page, Neil Schemenauer,
Sam Gross, Thomas Wouters, Donghee Na, Kirill Podoprigora and Ken Jin.
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I also added the @Fidget-Spinner, because I remember his early design involvation while he worked at Quansight.

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@Fidget-Spinner Fidget-Spinner Mar 15, 2025 •
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I think the main thing I did that is coming in 3.14 is the stackrefs. But we needed that for the intepreter anyways so it probably counts? Either way I can be left out if the others feel inclined to.

Meta also provided significant engineering resources for performance benchmark and
design per thread specialized bytecode mechanisms.


Other language changes
======================
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