[New-bugs-announce] [issue39117] Performance regression for making bound methods

[Raymond Hettinger]

New submission from Raymond Hettinger <raymond.hettinger at gmail.com>:

$ python3.9 -m timeit -r 11 -s 'class A: pass' -s 'A.m = lambda s: None' -s 'a = A()' 'a.m; a.m; a.m; a.m; a.m'
1000000 loops, best of 11: 230 nsec per loop

$ python3.8 -m timeit -r 11 -s 'class A: pass' -s 'A.m = lambda s: None' -s 'a = A()' 'a.m; a.m; a.m; a.m; a.m'
2000000 loops, best of 11: 149 nsec per loop

$ python3.7 -m timeit -r 11 -s 'class A: pass' -s 'A.m = lambda s: None' -s 'a = A()' 'a.m; a.m; a.m; a.m; a.m'
2000000 loops, best of 11: 159 nsec per loop

$ python3.6 -m timeit -r 11 -s 'class A: pass' -s 'A.m = lambda s: None' -s 'a = A()' 'a.m; a.m; a.m; a.m; a.m'
10000000 loops, best of 11: 0.159 usec per loop

Timings made using the recent released python.org macOS 64-bit builds.

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components: Interpreter Core
messages: 358781
nosy: rhettinger
priority: normal
severity: normal
status: open
title: Performance regression for making bound methods
type: performance
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39117>
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