Message259502
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 |
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Action |
Args |
2016-02-03 19:04:03 | yselivanov | set | recipients:
+ yselivanov, lemburg, rhettinger, mark.dickinson, pitrou, vstinner, casevh, serhiy.storchaka, josh.r, zbyrne |
2016-02-03 19:04:03 | yselivanov | set | messageid: <1454526243.48.0.15837117905.issue21955@psf.upfronthosting.co.za> |
2016-02-03 19:04:03 | yselivanov | link | issue21955 messages |
2016-02-03 19:04:03 | yselivanov | create | |
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