STINNER Victor added the comment: Results of bench_pow2.py on Linux.
Common platform: CPU model: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz Platform: Linux-3.13.9-200.fc20.x86_64-x86_64-with-fedora-20-Heisenbug Timer: time.perf_counter Python unicode implementation: PEP 393 Timer info: namespace(adjustable=False, implementation='clock_gettime(CLOCK_MONOTONIC)', monotonic=True, resolution=1e-09) CFLAGS: -Wno-unused-result -Werror=declaration-after-statement -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes Bits: int=32, long=64, long long=64, size_t=64, void*=64 Platform of campaign orig: Date: 2014-05-02 23:45:29 SCM: hg revision=62438d1b11c7 tag=tip branch=default date="2014-05-02 23:26 +0200" Timer precision: 49 ns Python version: 3.5.0a0 (default:62438d1b11c7, May 2 2014, 23:45:22) [GCC 4.8.2 20131212 (Red Hat 4.8.2-7)] Platform of campaign pow2: Python version: 3.5.0a0 (default:62438d1b11c7+, May 2 2014, 23:47:50) [GCC 4.8.2 20131212 (Red Hat 4.8.2-7)] SCM: hg revision=62438d1b11c7+ tag=tip branch=default date="2014-05-02 23:26 +0200" Timer precision: 51 ns Date: 2014-05-02 23:48:03 ---------------+--------------+---------------- Tests | orig | pow2 ---------------+--------------+---------------- 2 ** 0 | 40 ns (*) | 44 ns (+9%) 2 ** 1 | 264 ns (*) | 62 ns (-76%) 2 ** 3 | 270 ns (*) | 62 ns (-77%) 2 ** 5 | 269 ns (*) | 62 ns (-77%) 2 ** 10 | 278 ns (*) | 63 ns (-78%) 2 ** 15 | 299 ns (*) | 62 ns (-79%) 2 ** 20 | 287 ns (*) | 62 ns (-78%) 2 ** 25 | 302 ns (*) | 62 ns (-79%) 2 ** 28 | 293 ns (*) | 62 ns (-79%) 2 ** (2 ** 0) | 264 ns (*) | 62 ns (-77%) 2 ** (2 ** 1) | 264 ns (*) | 62 ns (-76%) 2 ** (2 ** 3) | 264 ns (*) | 62 ns (-77%) 2 ** (2 ** 5) | 286 ns (*) | 68 ns (-76%) 2 ** (2 ** 10) | 740 ns (*) | 68 ns (-91%) 2 ** (2 ** 15) | 93.1 us (*) | 180 ns (-100%) 2 ** (2 ** 20) | 3.94 ms (*) | 3.89 us (-100%) 2 ** (2 ** 25) | 154 ms (*) | 213 us (-100%) 2 ** (2 ** 28) | 1.36 sec (*) | 4.01 ms (-100%) ---------------+--------------+---------------- Total | 1.52 sec (*) | 4.23 ms (-100%) ---------------+--------------+---------------- ---------- Added file: http://bugs.python.org/file35139/bench_pow2.py _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue21420> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
