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gh-90815: Add mimalloc memory allocator (#109914)

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* Add mimalloc v2.12

Modified src/alloc.c to remove include of alloc-override.c and not
compile new handler.

Did not include the following files:

 - include/mimalloc-new-delete.h
 - include/mimalloc-override.h
 - src/alloc-override-osx.c
 - src/alloc-override.c
 - src/static.c
 - src/region.c

mimalloc is thread safe and shares a single heap across all runtimes,
therefore finalization and getting global allocated blocks across all
runtimes is different.

* mimalloc: minimal changes for use in Python:

 - remove debug spam for freeing large allocations
 - use same bytes (0xDD) for freed allocations in CPython and mimalloc
   This is important for the test_capi debug memory tests

* Don't export mimalloc symbol in libpython.
* Enable mimalloc as Python allocator option.
* Add mimalloc MIT license.
* Log mimalloc in Lib/test/pythoninfo.py.
* Document new mimalloc support.
* Use macro defs for exports as done in:
  https://github.com/python/cpython/pull/31164/

Co-authored-by: Sam Gross <colesbury@gmail.com>
Co-authored-by: Christian Heimes <christian@python.org>
Co-authored-by: Victor Stinner <vstinner@python.org>
This commit is contained in:
Dino Viehland 2023-10-30 08:43:11 -07:00 • committed by GitHub
parent 4ebf2fae96
commit 05f2f0ac92
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61 changed files with 16792 additions and 161 deletions
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12
Doc/c-api/memory.rst
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@ -391,6 +391,8 @@ Legend:
* ``malloc``: system allocators from the standard C library, C functions:
:c:func:`malloc`, :c:func:`calloc`, :c:func:`realloc` and :c:func:`free`.
* ``pymalloc``: :ref:`pymalloc memory allocator <pymalloc>`.
* ``mimalloc``: :ref:`mimalloc memory allocator <mimalloc>`. The pymalloc
allocator will be used if mimalloc support isn't available.
* "+ debug": with :ref:`debug hooks on the Python memory allocators
<pymem-debug-hooks>`.
* "Debug build": :ref:`Python build in debug mode <debug-build>`.
@ -672,6 +674,16 @@ Customize pymalloc Arena Allocator
Set the arena allocator.
.. _mimalloc:
The mimalloc allocator
======================
.. versionadded:: 3.13
Python supports the mimalloc allocator when the underlying platform support is available.
mimalloc "is a general purpose allocator with excellent performance characteristics.
Initially developed by Daan Leijen for the runtime systems of the Koka and Lean languages."
tracemalloc C API
=================