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PEP 684: Add a PEP for making the GIL per-interpreter #2387

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Merged
ericsnowcurrently merged 18 commits into from
Mar 9, 2022
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PEP 684: Add a PEP for making the GIL per-interpreter #2387

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12c4dbc
Add a PEP for making the GIL per-interpreter.
ericsnowcurrently Mar 8, 2022
f8f32ff
Fix dates.
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5d7131b
Set the PEP number.
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324c9d7
Change the filenme.
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40f7da7
Fix typos.
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Fix the filename.
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ed4e05d
Add a note about the allocators.
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ab72d4f
Add importlib.util.allow_all_extensions().
ericsnowcurrently Mar 8, 2022
306bf96
Add a note about the possibility of not sharing any objects at all.
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4a67da7
Clean up "Benefits to Consolidation".
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7c10d47
typos and formatting
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More formatting and wording.
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More formatting and wording.
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7362e78
Merge branch 'main' into per-interpreter-gil-focused
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Update CODEOWNERS.
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Add a note about the allocators.
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@ericsnowcurrently
ericsnowcurrently committed Mar 8, 2022
commit ed4e05d18fe988f9075132128e8e8c44522002ee
19 changes: 10 additions & 9 deletions pep-0684.rst
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Expand Up @@ -338,10 +338,13 @@ The following state will not be moved:
Also, a number of parts of the global state were already moved to the
interpreter, such as GC, warnings, and atexit hooks.
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Memory Allocators
-----------------

<TBD>
Note that currently the allocators (see Objects/obmalloc.c) are shared
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between all interpreters, protected by the GIL. They will need to move
to each interpreter (or a global lock will be needed). This is the
highest risk part of the work to isolate interpreters and may require
more than just moving fields down from ``_PyRuntimeState``. Some of
the complexity is reduced if CPython switches to a thread-safe
allocator like mimalloc.

.. _proposed capi:

Expand Down Expand Up @@ -585,14 +588,12 @@ Reference Implementation
Open Issues
===========

* what are the risks/hurdles involved with moving the allocators?
* add a helper to allow importing incompatible extensions?

Implementation details:

* explain sharing some global objects vs. sharing none of them?
* mention sharing the memory allocators?

Other:

* add a helper to allow importing incompatible extensions?


Deferred Functionality
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