STINNER Victor added the comment: It's between 2 and 3.5x faster.
It's 9% slower on short string (10 bytes for the output), but I consider that the speedup is more interesting than the slowdown on short strings. RMicrobenchmark: Common platform: Platform: Linux-4.1.6-200.fc22.x86_64-x86_64-with-fedora-22-Twenty_Two Timer: time.perf_counter CFLAGS: -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes Python unicode implementation: PEP 393 Timer info: namespace(adjustable=False, implementation='clock_gettime(CLOCK_MONOTONIC)', monotonic=True, resolution=1e-09) CPU model: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz Bits: int=32, long=64, long long=64, size_t=64, void*=64 Platform of campaign orig: SCM: hg revision=90e41d965228 tag=tip branch=default date="2015-10-14 10:10 +0200" Python version: 3.6.0a0 (default:90e41d965228, Oct 14 2015, 10:46:50) [GCC 5.1.1 20150618 (Red Hat 5.1.1-4)] Date: 2015-10-14 10:47:05 Timer precision: 54 ns Platform of campaign optim: SCM: hg revision=90e41d965228+ tag=tip branch=default date="2015-10-14 10:10 +0200" Python version: 3.6.0a0 (default:90e41d965228+, Oct 14 2015, 11:07:24) [GCC 5.1.1 20150618 (Red Hat 5.1.1-4)] Date: 2015-10-14 11:09:53 Timer precision: 62 ns -----------------------------------------+-------------+--------------- without spaces | orig | optim -----------------------------------------+-------------+--------------- data = "AB" * 10; bytes.fromhex(data) | 167 ns (*) | 181 ns (+9%) data = "AB" * 100; bytes.fromhex(data) | 621 ns (*) | 295 ns (-52%) data = "AB" * 10**3; bytes.fromhex(data) | 5.15 us (*) | 1.65 us (-68%) data = "AB" * 10**5; bytes.fromhex(data) | 500 us (*) | 147 us (-71%) -----------------------------------------+-------------+--------------- Total | 506 us (*) | 149 us (-70%) -----------------------------------------+-------------+--------------- ---------------------------------------------------+-------------+--------------- with 0.5 space | orig | optim ---------------------------------------------------+-------------+--------------- data = "ABAB " * (10 // 2); bytes.fromhex(data) | 179 ns (*) | 186 ns data = "ABAB " * (100 // 2); bytes.fromhex(data) | 659 ns (*) | 340 ns (-48%) data = "ABAB " * (10**3 // 2); bytes.fromhex(data) | 5.48 us (*) | 2.19 us (-60%) data = "ABAB " * (10**5 // 2); bytes.fromhex(data) | 529 us (*) | 194 us (-63%) ---------------------------------------------------+-------------+--------------- Total | 536 us (*) | 196 us (-63%) ---------------------------------------------------+-------------+--------------- ------------------------------------------+-------------+--------------- with 1 space | orig | optim ------------------------------------------+-------------+--------------- data = "AB " * 10; bytes.fromhex(data) | 180 ns (*) | 191 ns (+6%) data = "AB " * 100; bytes.fromhex(data) | 710 ns (*) | 330 ns (-54%) data = "AB " * 10**3; bytes.fromhex(data) | 5.77 us (*) | 1.99 us (-66%) data = "AB " * 10**5; bytes.fromhex(data) | 559 us (*) | 177 us (-68%) ------------------------------------------+-------------+--------------- Total | 565 us (*) | 179 us (-68%) ------------------------------------------+-------------+--------------- ---------------+-------------+-------------- Summary | orig | optim ---------------+-------------+-------------- without spaces | 506 us (*) | 149 us (-70%) with 0.5 space | 536 us (*) | 196 us (-63%) with 1 space | 565 us (*) | 179 us (-68%) ---------------+-------------+-------------- Total | 1.61 ms (*) | 525 us (-67%) ---------------+-------------+-------------- ---------- Added file: http://bugs.python.org/file40780/bench_fromhex.py _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue25401> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
