2016-12-09 18:46 GMT+01:00 Victor Stinner <victor.stinner@gmail.com>:
> Last days, I patched functions of PyObject_CallFunction() family to
> use internally fast calls.
> (...)
> http://bugs.python.org/issue28915

Oh, I forgot to mention the performance results of these changes.
Python slots are now a little bit faster. Extract of the issue:
http://bugs.python.org/issue28915#msg282748

Microbenchmark on a simple class with an __int__() method, call int(o):
int(o): Median +- std dev: [ref] 239 ns +- 13 ns -> [patch] 219 ns +-
14 ns: 1.10x faster (-9%)

Microbenchmark on a simple class with an __getitem__() method, call o[100]:
o[100]: Median +- std dev: [ref] 211 ns +- 11 ns -> [patch] 172 ns +-
11 ns: 1.23x faster (-19%)


Comparison between Python 2.7, 3.5, 3.7 and 3.7+patch, 3.5 is used as
the reference:

int(o)
======

Median +- std dev: [3.5] 271 ns +- 15 ns -> [3.7] 239 ns +- 13 ns:
1.13x faster (-12%)
Median +- std dev: [3.5] 271 ns +- 15 ns -> [patch] 219 ns +- 14 ns:
1.24x faster (-19%)
Median +- std dev: [3.5] 271 ns +- 15 ns -> [2.7] 401 ns +- 21 ns:
1.48x slower (+48%)

o[100]
======

Median +- std dev: [3.5] 206 ns +- 5 ns -> [3.7] 211 ns +- 11 ns:
1.02x slower (+2%)
Not significant!
Median +- std dev: [3.5] 206 ns +- 5 ns -> [patch] 172 ns +- 11 ns:
1.20x faster (-17%)
Median +- std dev: [3.5] 206 ns +- 5 ns -> [2.7] 254 ns +- 15 ns:
1.23x slower (+23%)

Victor
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