New submission from Sergey Fedoseev <[email protected]>:
Argument Clinic generates `{NULL, NULL}` initializer for Py_buffer variables.
Such initializer zeroes all Py_buffer members, but as I understand only `obj`
and `buf` members are really had to be initialized. Avoiding unneeded
initialization provides tiny speed-up:
$ python -m perf timeit -s "replace = b''.replace" "replace(b'', b'')"
--compare-to=../cpython-master/venv/bin/python --duplicate=1000
/home/sergey/tmp/cpython-master/venv/bin/python: ..................... 43.0 ns
+- 0.5 ns
/home/sergey/tmp/cpython-dev/venv/bin/python: ..................... 41.8 ns +-
0.4 ns
Mean +- std dev: [/home/sergey/tmp/cpython-master/venv/bin/python] 43.0 ns +-
0.5 ns -> [/home/sergey/tmp/cpython-dev/venv/bin/python] 41.8 ns +- 0.4 ns:
1.03x faster (-3%)
----------
components: Argument Clinic
messages: 349582
nosy: larry, sir-sigurd
priority: normal
severity: normal
status: open
title: Initialize Py_buffer variables more efficiently
type: performance
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue37842>
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