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[3.13] GH-133231: Backport `PYTHON_JIT` documentation to 3.13 by brandtbucher · Pull Request #133539 · python/cpython · GitHub

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[3.13] GH-133231: Backport PYTHON_JIT documentation to 3.13 #133539

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brandtbucher merged 2 commits into from
May 6, 2025
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[3.13] GH-133231: Backport PYTHON_JIT documentation to 3.13 #133539

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344cfd0
Backport PYTHON_JIT documentation to 3.13
brandtbucher May 6, 2025
22d11de
Also backport (.gitignore changes for branch switches)
brandtbucher May 6, 2025
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2 changes: 1 addition & 1 deletion .gitignore
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Expand Up @@ -138,7 +138,7 @@ Tools/unicode/data/
# hendrikmuhs/ccache-action@v1
/.ccache
/cross-build/
/jit_stencils.h
/jit_stencils*.h
/platform
/profile-clean-stamp
/profile-run-stamp
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8 changes: 8 additions & 0 deletions Doc/using/cmdline.rst
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Expand Up @@ -1229,6 +1229,14 @@ conflict.

.. versionadded:: 3.13

.. envvar:: PYTHON_JIT

On builds where experimental just-in-time compilation is available, this
variable can force the JIT to be disabled (``0``) or enabled (``1``) at
interpreter startup.

.. versionadded:: 3.13

Debug-mode variables
~~~~~~~~~~~~~~~~~~~~

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6 changes: 3 additions & 3 deletions Doc/whatsnew/3.13.rst
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Expand Up @@ -390,11 +390,11 @@ without the optional value.

* ``no``: Disable the entire Tier 2 and JIT pipeline.
* ``yes``: Enable the JIT.
To disable the JIT at runtime, pass the environment variable ``PYTHON_JIT=0``.
To disable the JIT at runtime, pass the environment variable :envvar:`PYTHON_JIT=0 <PYTHON_JIT>`.
* ``yes-off``: Build the JIT but disable it by default.
To enable the JIT at runtime, pass the environment variable ``PYTHON_JIT=1``.
To enable the JIT at runtime, pass the environment variable :envvar:`PYTHON_JIT=1 <PYTHON_JIT>`.
* ``interpreter``: Enable the Tier 2 interpreter but disable the JIT.
The interpreter can be disabled by running with ``PYTHON_JIT=0``.
The interpreter can be disabled by running with :envvar:`PYTHON_JIT=0 <PYTHON_JIT>`.

The internal architecture is roughly as follows:

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