GH-103906: Remove immortal refcounting in the interpreter #103909
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brandtbucher
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Apr 26, 2023
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brandtbucher
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- Issue: Avoid reference counting operations on None, True, False in the interpreter #103906
brandtbucher
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hauntsaninja
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Apr 27, 2023
sunmy2019
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Apr 27, 2023
| } | ||
| else if (Py_IsFalse(cond)) { | ||
| _Py_DECREF_NO_DEALLOC(cond); | ||
| if (Py_IsFalse(cond)) { |
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Will this cause a performance change, since formerly IsTrue then IsFalse, now IsFalse then IsTrue
Though this comparison is lightweight.
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Honestly, I doubt it.
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sobolevn
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Apr 27, 2023
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@sobolevn possibly, but it's best left to a different PR. In many places it's unlikely to make a significant difference, so it might not be worth the churn to make the change everywhere. |
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Annoyingly, perf impact is neutral. However, it appears that the results are being pulled way down by a couple of known unstable benchmarks that should be unaffected by this change. I might try running them again tonight, just to see. (I still think this is worth doing, though, as it clearly removes unnecessary work from many hot code paths.) |
markshannon
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May 12, 2023
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I noticed one more opportunity like this: in the |
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carljm
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May 17, 2023
* main: (26 commits) pythonGH-101520: Move tracemalloc functionality into core, leaving interface in Modules. (python#104508) typing: Add more tests for TypeVar (python#104571) pythongh-104572: Improve error messages for invalid constructs in PEP 695 contexts (python#104573) typing: Use PEP 695 syntax in typing.py (python#104553) pythongh-102153: Start stripping C0 control and space chars in `urlsplit` (python#102508) pythongh-104469: Update README.txt for _testcapi (pythongh-104529) pythonGH-103092: isolate `_elementtree` (python#104561) pythongh-104050: Add typing to Argument Clinic converters (python#104547) pythonGH-103906: Remove immortal refcounting in the interpreter (pythonGH-103909) pythongh-87474: Fix file descriptor leaks in subprocess.Popen (python#96351) pythonGH-103092: isolate `pyexpat` (python#104506) pythongh-75367: Fix data descriptor detection in inspect.getattr_static (python#104517) pythongh-104050: Add more annotations to `Tools/clinic.py` (python#104544) pythongh-104555: Fix isinstance() and issubclass() for runtime-checkable protocols that use PEP 695 (python#104556) pythongh-103865: add monitoring support to LOAD_SUPER_ATTR (python#103866) CODEOWNERS: Assign new PEP 695 files to myself (python#104551) pythonGH-104510: Fix refleaks in `_io` base types (python#104516) pythongh-104539: Fix indentation error in logging.config.rst (python#104545) pythongh-104050: Don't star-import 'types' in Argument Clinic (python#104543) pythongh-104050: Add basic typing to CConverter in clinic.py (python#104538) ...
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