Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 14 commits into from
May 10, 2025
Merged

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

Changes from 5 commits
Commits
Show all changes
14 commits
Select commit Hold shift + click to select a range
2b11fd2
gh-11599: Update whats news for free-threaded 3.14
corona10 Mar 15, 2025
4b87b5b
Add Ken Jin because he involves early design
corona10 Mar 15, 2025
e384e7a
Apply suggestions from code review
corona10 Mar 16, 2025
1b0d395
Update Doc/whatsnew/3.14.rst
corona10 Mar 16, 2025
90cbdaf
Merge branch 'main' into gh-11599-docs
corona10 Mar 18, 2025
c2d689d
Update Doc/whatsnew/3.14.rst
corona10 May 9, 2025
244d00c
Update Doc/whatsnew/3.14.rst
corona10 May 9, 2025
090a33e
Merge branch 'main' into gh-11599-docs
corona10 May 9, 2025
64a7af0
Update Doc/whatsnew/3.14.rst
corona10 May 9, 2025
2fdbac5
Update Doc/whatsnew/3.14.rst
corona10 May 9, 2025
920b493
Update Doc/whatsnew/3.14.rst
corona10 May 9, 2025
290149a
Wrap
corona10 May 10, 2025
3dd4d3f
wrap again
corona10 May 10, 2025
ce28d25
Add Edgar Margffoy
corona10 May 10, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 19 additions & 0 deletions Doc/whatsnew/3.14.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,7 @@ Summary -- release highlights
* :ref:`PEP 761: Discontinuation of PGP signatures <whatsnew314-pep761>`
* :ref:`A new type of interpreter <whatsnew314-tail-call>`
* :ref:`PEP 765: Disallow return/break/continue that exit a finally block <whatsnew314-pep765>`
* :ref:`Free-threaded CPython <whatsnew314-free-threaded-cpython>`


Incompatible changes
Expand Down Expand Up @@ -312,6 +313,24 @@ 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 mechanism is almost same
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 achieves better performance,
and is only 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.
Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I also added the @Fidget-Spinner, because I remember his early design involvation while he worked at Quansight.

Copy link
Member

@Fidget-Spinner Fidget-Spinner Mar 15, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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 benchmarking and
design of per thread specialized bytecode mechanisms.


Other language changes
======================
Expand Down
Loading