Message242913
| Author |
scoder |
| Recipients |
BreamoreBoy, brett.cannon, ethan.furman, larry, lemburg, mark.dickinson, pitrou, rhettinger, scoder, serhiy.storchaka |
| Date |
2015年05月11日.20:06:25 |
| SpamBayes Score |
-1.0 |
| Marked as misclassified |
Yes |
| Message-id |
<1431374785.33.0.926833556173.issue24165@psf.upfronthosting.co.za> |
| In-reply-to |
| Content |
Well, as I've shown in issue 24076 (I'm copying the numbers here), even simple arithmetic expressions can benefit from a free-list. Basically anything that uses temporary integer results.
Original:
$ ./python -m timeit 'sum(range(1, 100000))'
1000 loops, best of 3: 1.86 msec per loop
$ ./python -m timeit -s 'l = list(range(1000, 10000))' '[(i*2+5) // 7 for i in l]'
1000 loops, best of 3: 1.05 msec per loop
With freelist:
$ ./python -m timeit 'sum(range(1, 100000))'
1000 loops, best of 3: 1.52 msec per loop
$ ./python -m timeit -s 'l = list(range(1000, 10000))' '[(i*2+5) // 7 for i in l]'
1000 loops, best of 3: 931 usec per loop |
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