Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
Some examples:
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 -s "round_ = round" "round_(4.2)"
Mean +- std dev: [...] 110 ns +- 3 ns -> [...] 81.4 ns +- 2.2 ns: 1.35x faster
(-26%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 -s "sum_ = sum" "sum_(())"
Mean +- std dev: [...] 88.0 ns +- 6.5 ns -> [...] 57.6 ns +- 1.1 ns: 1.53x
faster (-35%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 -s "sum_ = sum; a = [1, 2]" "sum_(a)"
Mean +- std dev: [...] 95.9 ns +- 2.1 ns -> [...] 70.6 ns +- 2.0 ns: 1.36x
faster (-26%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 "'abc'.split()"
Mean +- std dev: [...] 102 ns +- 3 ns -> [...] 80.5 ns +- 2.1 ns: 1.26x faster
(-21%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 "b'abc'.split()"
Mean +- std dev: [...] 91.8 ns +- 2.3 ns -> [...] 75.1 ns +- 1.4 ns: 1.22x
faster (-18%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 "'abc'.split('-')"
Mean +- std dev: [...] 118 ns +- 2 ns -> [...] 89.2 ns +- 1.8 ns: 1.32x faster
(-24%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 "b'abc'.decode()"
Mean +- std dev: [...] 96.1 ns +- 3.6 ns -> [...] 78.9 ns +- 2.2 ns: 1.22x
faster (-18%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 "'abc'.encode()"
Mean +- std dev: [...] 72.4 ns +- 1.9 ns -> [...] 55.1 ns +- 1.8 ns: 1.31x
faster (-24%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 -s "int_= int" "int(4.2)"
Mean +- std dev: [...] 105 ns +- 4 ns -> [...] 78.8 ns +- 1.9 ns: 1.33x faster
(-25%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 -s "int_= int" "int('5')"
Mean +- std dev: [...] 154 ns +- 5 ns -> [...] 122 ns +- 4 ns: 1.26x faster
(-21%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 "42 .to_bytes(2, 'little')
Mean +- std dev: [...] 109 ns +- 3 ns -> [...] 72.4 ns +- 1.9 ns: 1.51x faster
(-34%)
$ ./python -m perf timeit --compare-to=../cpython-release-baseline/python
--duplicate=1000 "from_bytes = int.from_bytes" "from_bytes(b'ab', 'little')"
Mean +- std dev: [...] 138 ns +- 3 ns -> [...] 96.3 ns +- 3.0 ns: 1.43x faster
(-30%)
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<https://bugs.python.org/issue36127>
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