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gh-135805: Document the X option and env var for controlling thread-local bytecode #135868

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Jun 24, 2025
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gh-135805: Document the X option and env var for controlling thread-local bytecode #135868

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b442eca
Document the X option and env var for controlling thread-local bytecode
mpage Jun 23, 2025
a99539b
Replace references to "tier 1" with "specializing interpreter"
mpage Jun 24, 2025
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17 changes: 17 additions & 0 deletions Doc/using/cmdline.rst
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Expand Up @@ -669,6 +669,13 @@ Miscellaneous options

.. versionadded:: 3.14

* :samp:`-X tlbc={0,1}` enables (1, the default) or disables (0) thread-local
bytecode in builds configured with :option:`--disable-gil`. When disabled,
this also disables specialization in the tier 1 interpreter. See also
:envvar:`PYTHON_TLBC`.

.. versionadded:: 3.14

It also allows passing arbitrary values and retrieving them through the
:data:`sys._xoptions` dictionary.

Expand Down Expand Up @@ -1302,6 +1309,16 @@ conflict.

.. versionadded:: 3.13

.. envvar:: PYTHON_TLBC

If set to ``1`` enables thread-local bytecode. If set to ``0`` thread-local
bytecode (and specialization in the tier 1 interpreter) is disabled. Only
applies to builds configured with :option:`--disable-gil`.

See also the :option:`-X tlbc <-X>` command-line option

.. versionadded:: 3.14

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

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