[New-bugs-announce] [issue28243] Performance regression in functools.partial()

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

There is 10% performance regression in calling functools.partial() in 3.6.

$ ./python -m perf timeit -s 'from functools import partial; f = lambda x, y: None; g = partial(f, 1)' -- 'g(2)'

Python 3.5:  Median +- std dev: 452 ns +- 25 ns
Python 3.6:  Median +- std dev: 491 ns +- 12 ns

----------
components: Interpreter Core
messages: 277176
nosy: haypo, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Performance regression in functools.partial()
type: performance
versions: Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28243>
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