INADA Naoki added the comment: I modified the patch to avoid incref&decref when pair is not list, because tuple is common for such case. But I can't get back original performance.
(python 2.7 is modified version of patch) inada-n@test1:~/work/bench$ ~/local/py27/bin/master -m perf timeit --rigorous --python ~/local/py27/bin/python2.7 --compare-to ~/local/py27/bin/master -s 'L = [(i,i) for i in range(10000)]' -- 'dict(L)' master: ......................................... 1.47 ms +- 0.06 ms python2.7: ......................................... 1.55 ms +- 0.06 ms Median +- std dev: [master] 1.47 ms +- 0.06 ms -> [python2.7] 1.55 ms +- 0.06 ms: 1.05x slower inada-n@test1:~/work/bench$ ~/local/py27/bin/master -m perf timeit --rigorous --python ~/local/py27/bin/python2.7 --compare-to ~/local/py27/bin/patched -s 'L = [(i,i) for i in range(10000)]' -- 'dict(L)' patched: ......................................... 1.56 ms +- 0.08 ms python2.7: ......................................... 1.55 ms +- 0.09 ms Median +- std dev: [patched] 1.56 ms +- 0.08 ms -> [python2.7] 1.55 ms +- 0.09 ms: 1.01x faster Not significant! ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27945> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
