STINNER Victor added the comment:
Result of bench.py attached to issue #25267: attached bench_utf8_result.txt.
------------------------------------------------------+-------------+---------------
Summary | utf8_before |
utf8_after
------------------------------------------------------+-------------+---------------
ignore: "\udcff" * length | 7.63 us (*) |
7.91 us
ignore: "a" * length + "\udcff" | 10.7 us (*) |
10.8 us
ignore: ("a" * 99 + "\udcff" * 99) * length | 2.17 ms (*) |
2.16 ms
ignore: ("\udcff" * 99 + "a") * length | 843 us (*) |
866 us
ignore: "\udcff" + "a" * length | 10.7 us (*) |
11 us
replace: "\udcff" * length | 7.87 us (*) | 8.43 us
(+7%)
replace: "a" * length + "\udcff" | 10.8 us (*) |
10.9 us
replace: ("a" * 99 + "\udcff" * 99) * length | 2.46 ms (*) |
2.46 ms
replace: ("\udcff" * 99 + "a") * length | 907 us (*) |
939 us
replace: "\udcff" + "a" * length | 10.9 us (*) |
11 us
surrogateescape: "\udcff" * length | 14.2 us (*) | 17.2 us
(+21%)
surrogateescape: "a" * length + "\udcff" | 10.6 us (*) |
10.7 us
surrogateescape: ("a" * 99 + "\udcff" * 99) * length | 3.19 ms (*) | 3.4 ms
(+7%)
surrogateescape: ("\udcff" * 99 + "a") * length | 1.64 ms (*) | 1.87 ms
(+13%)
surrogateescape: "\udcff" + "a" * length | 10.6 us (*) |
10.7 us
surrogatepass: "\udcff" * length | 23.1 us (*) |
23.5 us
surrogatepass: "a" * length + "\udcff" | 10.7 us (*) |
10.8 us
surrogatepass: ("a" * 99 + "\udcff" * 99) * length | 4.39 ms (*) |
4.44 ms
surrogatepass: ("\udcff" * 99 + "a") * length | 2.43 ms (*) |
2.47 ms
surrogatepass: "\udcff" + "a" * length | 10.6 us (*) |
10.8 us
backslashreplace: "\udcff" * length | 65.7 us (*) |
64.3 us
backslashreplace: "a" * length + "\udcff" | 15.7 us (*) |
15 us
backslashreplace: ("a" * 99 + "\udcff" * 99) * length | 12 ms (*) | 15.9 ms
(+32%)
backslashreplace: ("\udcff" * 99 + "a") * length | 11.1 ms (*) | 13.5 ms
(+22%)
backslashreplace: "\udcff" + "a" * length | 16.4 us (*) | 15.1 us
(-8%)
------------------------------------------------------+-------------+---------------
Total | 41.4 ms (*) | 48.3 ms
(+17%)
------------------------------------------------------+-------------+---------------
----------
Added file: http://bugs.python.org/file40683/bench_utf8_result.txt
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<http://bugs.python.org/issue25318>
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