STINNER Victor <vstin...@python.org> added the comment:
I wrote a microbenchmark on Py_INCREF()+Py_DECREF(): $ python3 -m pyperf compare_to ref.json limited.json Mean +- std dev: [ref] 3.45 ns +- 0.17 ns -> [limited] 6.03 ns +- 0.21 ns: 1.75x slower If a function is only made of Py_INCREF() and Py_DECREF(), it can be up to 1.8x slower in the worst case. But in practice, I don't think that functions are only made of Py_INCREF() and Py_DECREF(). They do a few other things. I'm not sure how to run a "macro benchmark" on my PR 25131, since I don't know any C extension doing anything useful. There is xxlimited, but it does almost nothing. What would be a fair benchmark for this change? -- To run my microbenchmark: git apply bench.patch ./configure --with-lto --enable-optimizations make ./python -m venv env ./env/bin/python -m pip install pyperf ./env/bin/python ../bench_limited.py -o ../limited.json -v ./env/bin/python ../bench_testcapi.py -o ../ref.json -v ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue43688> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
