Message315412
| Author |
serhiy.storchaka |
| Recipients |
rhettinger, serhiy.storchaka |
| Date |
2018年04月17日.20:32:06 |
| SpamBayes Score |
-1.0 |
| Marked as misclassified |
Yes |
| Message-id |
<1523997126.24.0.682650639539.issue33234@psf.upfronthosting.co.za> |
| In-reply-to |
| Content |
Calling PyObject_LengthHint() adds an overhead. It is significant for short sequences. I work on a patch that reduces it. PR 6493 adds the second call of PyObject_LengthHint() and increases the overhead.
As for this issue, in-place repeat overallocates too.
>>> a = [0]; a *= 10; getsizeof(a)
200
I think it would be better to make it not preallocating.
And maybe it would be worth to avoid overallocating if newsize > allocated + allocated/8 or something like. |
|
History
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| Date |
User |
Action |
Args |
| 2018年04月17日 20:32:06 | serhiy.storchaka | set | recipients:
+ serhiy.storchaka, rhettinger |
| 2018年04月17日 20:32:06 | serhiy.storchaka | set | messageid: <1523997126.24.0.682650639539.issue33234@psf.upfronthosting.co.za> |
| 2018年04月17日 20:32:06 | serhiy.storchaka | link | issue33234 messages |
| 2018年04月17日 20:32:06 | serhiy.storchaka | create |
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