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gh-148726: Document the GC change in What's New in Python 3.14 (#149209)

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Hugo van Kemenade
2026-05-01 21:57:09 +03:00
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commit 4e3811f053
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Doc/whatsnew/3.14.rst
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@@ -953,10 +953,24 @@ when a module is imported) will still emit the syntax warning.
(Contributed by Irit Katriel in :gh:`130080`.)
.. _incremental-garbage-collection:
.. _whatsnew314-incremental-gc:
Incremental garbage collection
------------------------------
Garbage collection
------------------
**From Python 3.14.5 onwards:**
The garbage collector (GC) has changed in Python 3.14.5.
Python 3.14.0-3.14.4 shipped with a new incremental GC.
However, due to a number of `reports
<https://github.com/python/cpython/issues/142516>`__
of significant memory pressure in production environments,
it has been reverted back to the generational GC from 3.13.
This is the GC now used in Python 3.14.5 and later.
**Previously in Python 3.14.0-3.14.4:**
The cycle garbage collector is now incremental.
This means that maximum pause times are reduced
@@ -2203,7 +2217,18 @@ difflib
gc
--
* The new :ref:`incremental garbage collector <whatsnew314-incremental-gc>`
* **From Python 3.14.5 onwards:**
Python 3.14.0-3.14.4 shipped with a new incremental garbage collector.
However, due to a number of `reports
<https://github.com/python/cpython/issues/142516>`__
of significant memory pressure in production environments,
it has been reverted back to the generational GC from 3.13.
This is the GC now used in Python 3.14.5 and later.
* **Previously in Python 3.14.0-3.14.4:**
The new :ref:`incremental garbage collector <whatsnew314-incremental-gc>`
means that maximum pause times are reduced
by an order of magnitude or more for larger heaps.
@@ -3447,3 +3472,17 @@ Changes in the C API
functions on Python 3.13 and older.
.. _pythoncapi-compat project: https://github.com/python/pythoncapi-compat/
Notable changes in 3.14.5
=========================
gc
--
* The incremental garbage collector shipped in Python 3.14.0-3.14.4 has been
reverted back to the generational garbage collector from 3.13,
due to a number of `reports
<https://github.com/python/cpython/issues/142516>`__
of significant memory pressure in production environments.
See :ref:`whatsnew314-incremental-gc` for details.