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[3.14] gh-148726: Document the GC change in What's New in Python 3.14 (GH-149209) (#149249)

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Hugo van Kemenade
2026-05-01 22:08:33 +03:00
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Doc/whatsnew/3.14.rst
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@@ -954,10 +954,24 @@ 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
@@ -2204,7 +2218,18 @@ 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.
@@ -3456,3 +3481,17 @@ Notable changes in 3.14.1
the stack protection base address and stack protection size of a Python
thread state.
(Contributed by Victor Stinner in :gh:`139653`.)
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.