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[3.14] gh-148726: Document the GC change in What's New in Python 3.14 (GH-149209) by hugovk · Pull Request #149249 · python/cpython · GitHub

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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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hugovk merged 1 commit into from
May 1, 2026
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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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45 changes: 42 additions & 3 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -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
Expand Down Expand Up @@ -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.

Expand Down Expand Up @@ -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.
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