New submission from STINNER Victor: The pull request makes functools.partial() faster for positional arguments. It avoids the creation of a tuple for positional arguments. It allocates a small buffer for up to 5 parameters. But it seems like even if the small buffer is not used, it's still faster.
Use small buffer, total: 2 positional arguments. haypo@smithers$ ./python -m perf timeit -s 'from functools import partial; f = lambda x, y: None; g = partial(f, 1)' 'g(2)' --duplicate=100 --compare-to ../master-ref/python --python-names=ref:patch --python-names=ref:patch ref: ..................... 138 ns +- 1 ns patch: ..................... 121 ns +- 1 ns Median +- std dev: [ref] 138 ns +- 1 ns -> [patch] 121 ns +- 1 ns: 1.14x faster (-12%) Don't use small buffer, total: 6 positional arguments. haypo@smithers$ ./python -m perf timeit -s 'from functools import partial; f = lambda a1, a2, a3, a4, a5, a6: None; g = partial(f, 1, 2, 3, 4, 5)' 'g(6)' --duplicate=100 --compare-to ../master-ref/python --python-names=ref:patch --python-names=ref:patch ref: ..................... 156 ns +- 1 ns patch: ..................... 136 ns +- 0 ns Median +- std dev: [ref] 156 ns +- 1 ns -> [patch] 136 ns +- 0 ns: 1.15x faster (-13%) Another benchmark with 10 position arguments: haypo@smithers$ ./python -m perf timeit -s 'from functools import partial; f = lambda a1, a2, a3, a4, a5, a6, a7, a8, a9, a10: None; g = partial(f, 1, 2, 3, 4, 5)' 'g(6, 7, 8, 9, 10)' --duplicate=100 --compare-to ../master-ref/python --python-names=ref:patch --python-names=ref:patch ref: ..................... 193 ns +- 1 ns patch: ..................... 166 ns +- 2 ns Median +- std dev: [ref] 193 ns +- 1 ns -> [patch] 166 ns +- 2 ns: 1.17x faster (-14%) ---------- messages: 289100 nosy: haypo priority: normal severity: normal status: open title: Optimize functools.partial() for positional arguments type: performance versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29735> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
