Author yselivanov
Recipients casevh, josh.r, lemburg, mark.dickinson, pitrou, rhettinger, serhiy.storchaka, vstinner, yselivanov, zbyrne
Date 2016-02-03.19:04:03
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Message-id <1454526243.48.0.15837117905.issue21955@psf.upfronthosting.co.za>
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Antoine, yeah, it's probably turbo boost related.  There is no easy way to turn it off on mac os x, though.  I hope Victor's patch to perf.py will help to mitigate this. 

Victor, Marc-Andre,

Updated results of nano-bench (best of 10):

-m timeit -s "loops=tuple(range(100))" "sum([x * x * 1 for x in loops])"
2.7  8.5     3.5  10.1     3.6  8.91

-m timeit -s "loops=tuple(range(100))" "sum([x + x + 1 for x in loops])"
2.7  7.27    3.5  8.2      3.6  7.13

-m timeit -s "loops=tuple(range(100))" "sum([x - x - 1 for x in loops])"
2.7  7.01    3.5  8.1      3.6  6.95

Antoine, Serhiy, I'll upload a new patch soon.  Probably Serhiy's idea of using a switch statement will make it slightly faster.  I'll also add a fast path for integer division.
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Date User Action Args
2016-02-03 19:04:03yselivanovsetrecipients: + yselivanov, lemburg, rhettinger, mark.dickinson, pitrou, vstinner, casevh, serhiy.storchaka, josh.r, zbyrne
2016-02-03 19:04:03yselivanovsetmessageid: <1454526243.48.0.15837117905.issue21955@psf.upfronthosting.co.za>
2016-02-03 19:04:03yselivanovlinkissue21955 messages
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