https://github.com/python/cpython/commit/5e390a0fc825f21952beb158e2bda3c5e00... commit: 5e390a0fc825f21952beb158e2bda3c5e007fac9 branch: main author: Daniel Hollas <danekhollas@gmail.com> committer: AlexWaygood <Alex.Waygood@Gmail.com> date: 2024-01-31T09:29:44Z summary: gh-109653: Speedup import of threading module (#114509) Avoiding an import of functools leads to 50% speedup of import time. Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com> files: A Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst M Lib/threading.py diff --git a/Lib/threading.py b/Lib/threading.py index 00b95f8d92a1f0..75a08e5aac97d6 100644 --- a/Lib/threading.py +++ b/Lib/threading.py @@ -3,7 +3,6 @@ import os as _os import sys as _sys import _thread -import functools import warnings from time import monotonic as _time @@ -1630,8 +1629,7 @@ def _register_atexit(func, *arg, **kwargs): if _SHUTTING_DOWN: raise RuntimeError("can't register atexit after shutdown") - call = functools.partial(func, *arg, **kwargs) - _threading_atexits.append(call) + _threading_atexits.append(lambda: func(*arg, **kwargs)) from _thread import stack_size diff --git a/Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst b/Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst new file mode 100644 index 00000000000000..76074df9c76fa6 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst @@ -0,0 +1 @@ +Reduce the import time of :mod:`threading` module by ~50%. Patch by Daniel Hollas.