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gh-115999: Update whats news for free-threaded 3.14 #131285

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gh-115999: Update whats news for free-threaded 3.14 #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
corona10 Mar 15, 2025
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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
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Suggested change
as the specializing adaptive interpreter, the execution mechanisms is almost same
as the specializing adaptive interpreter. The execution mechanism is almost same

as the default build, but at free-threaded CPython build, each thread maintains
a thread-local copy of specialized bytecode.
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@StanFromIreland StanFromIreland Mar 15, 2025 •
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Suggested change
as the default build, but at free-threaded CPython build, each thread maintains
a thread-local copy of specialized bytecode.
as the default build, however in a 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.
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With this change, the free-threaded CPython build achieve better performance
and 10-15% slower than the default build.
With this change, the free-threaded CPython build achieves better performance,
and is only 10-15% slower than the default build.

Maybe take out the slower part altogether ;-)


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
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Meta also provided significant engineering resources for performance benchmark and
Meta also provided significant engineering resources for performance benchmarking and

I presume this is intended?

design per thread specialized bytecode mechanisms.
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design per thread specialized bytecode mechanisms.
design of per thread specialized bytecode mechanisms.



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