STINNER Victor added the comment: Results of the microbenchmark on the UTF-8 decoder.
As expected, performances on valid UTF-8 is unchanged, which was an important goal for me. Decoding with error handlers optimized by the patch are *much* faster. backslashreplace is still slow, because I didn't optimize it. Common platform: Python unicode implementation: PEP 393 Timer: time.perf_counter Platform: Linux-4.1.5-200.fc22.x86_64-x86_64-with-fedora-22-Twenty_Two CPU model: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz Timer info: namespace(adjustable=False, implementation='clock_gettime(CLOCK_MONOTONIC)', monotonic=True, resolution=1e-09) Bits: int=32, long=64, long long=64, size_t=64, void*=64 CFLAGS: -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes Timer precision: 55 ns Platform of campaign before: SCM: hg revision=f51921883f50 tag=tip branch=default date="2015-10-04 01:19 -0400" Python version: 3.6.0a0 (default:f51921883f50, Oct 4 2015, 10:19:37) [GCC 5.1.1 20150618 (Red Hat 5.1.1-4)] Date: 2015-10-04 10:19:44 Platform of campaign after: SCM: hg revision=f51921883f50+ tag=tip branch=default date="2015-10-04 01:19 -0400" Python version: 3.6.0a0 (default:f51921883f50+, Oct 4 2015, 10:14:05) [GCC 5.1.1 20150618 (Red Hat 5.1.1-4)] Date: 2015-10-04 10:18:55 ---------------------+-------------+-------- valid UTF-8 (strict) | before | after ---------------------+-------------+-------- 100 x 10**1 bytes | 297 ns (*) | 297 ns 100 x 10**3 bytes | 7.4 us (*) | 7.44 us 100 x 10**2 bytes | 929 ns (*) | 924 ns 100 x 10**4 bytes | 80.4 us (*) | 80.4 us ---------------------+-------------+-------- Total | 89.1 us (*) | 89 us ---------------------+-------------+-------- ------------------+-------------+--------------- ignore | before | after ------------------+-------------+--------------- 100 x 10**1 bytes | 6.68 us (*) | 743 ns (-89%) 100 x 10**3 bytes | 561 us (*) | 42.6 us (-92%) 100 x 10**2 bytes | 56.8 us (*) | 4.55 us (-92%) 100 x 10**4 bytes | 6.02 ms (*) | 425 us (-93%) ------------------+-------------+--------------- Total | 6.65 ms (*) | 473 us (-93%) ------------------+-------------+--------------- ------------------+-------------+--------------- replace | before | after ------------------+-------------+--------------- 100 x 10**1 bytes | 7.61 us (*) | 890 ns (-88%) 100 x 10**3 bytes | 639 us (*) | 50.3 us (-92%) 100 x 10**2 bytes | 64.8 us (*) | 5.37 us (-92%) 100 x 10**4 bytes | 7.09 ms (*) | 505 us (-93%) ------------------+-------------+--------------- Total | 7.81 ms (*) | 561 us (-93%) ------------------+-------------+--------------- ------------------+-------------+--------------- surrogateescape | before | after ------------------+-------------+--------------- 100 x 10**1 bytes | 7.96 us (*) | 855 ns (-89%) 100 x 10**3 bytes | 674 us (*) | 50.2 us (-93%) 100 x 10**2 bytes | 68.8 us (*) | 5.35 us (-92%) 100 x 10**4 bytes | 7.38 ms (*) | 504 us (-93%) ------------------+-------------+--------------- Total | 8.13 ms (*) | 560 us (-93%) ------------------+-------------+--------------- ------------------+-------------+-------- backslashreplace | before | after ------------------+-------------+-------- 100 x 10**1 bytes | 7.66 us (*) | 7.89 us 100 x 10**3 bytes | 633 us (*) | 633 us 100 x 10**2 bytes | 64.1 us (*) | 64.6 us 100 x 10**4 bytes | 6.9 ms (*) | 6.93 ms ------------------+-------------+-------- Total | 7.61 ms (*) | 7.64 ms ------------------+-------------+-------- ---------------------+-------------+--------------- Summary | before | after ---------------------+-------------+--------------- valid UTF-8 (strict) | 89.1 us (*) | 89 us ignore | 6.65 ms (*) | 473 us (-93%) replace | 7.81 ms (*) | 561 us (-93%) surrogateescape | 8.13 ms (*) | 560 us (-93%) backslashreplace | 7.61 ms (*) | 7.64 ms ---------------------+-------------+--------------- Total | 30.3 ms (*) | 9.32 ms (-69%) ---------------------+-------------+--------------- ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue25301> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
