Message 337900 - Python tracker

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Author	methane
Recipients	Mark.Shannon, josh.r, louielu, methane, r.david.murray, rhettinger, serhiy.storchaka, terry.reedy, tim.peters, vstinner, xiang.zhang
Date	2019-03-14.08:04:28
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1552550669.15.0.283010949251.issue30040@roundup.psfhosted.org>
In-reply-to

Content
Benchmark result is here. https://github.com/methane/sandbox/tree/master/2019.01/empty-dict notes: * Overhead introduced by PR 1080 (https://bugs.python.org/issue30040#msg337778) is cancelled by first insert optimization. It is now faster than before. * PR 12307 (first insert optimization) is about 2x faster on creating & destroy empty dict. Other performance diff is small. * PR 12308 (use keys=NULL instead of shared empty keys) is more faster than PR 12307 on some cases, while it requires much `if (md->ma_keys == NULL)` checks.

Benchmark result is here.

https://github.com/methane/sandbox/tree/master/2019.01/empty-dict

notes:

* Overhead introduced by PR 1080 (https://bugs.python.org/issue30040#msg337778) is cancelled by first insert optimization.  It is now faster than before.

* PR 12307 (first insert optimization) is about 2x faster on creating & destroy empty dict.  Other performance diff is small.

* PR 12308 (use keys=NULL instead of shared empty keys) is more faster than PR 12307 on some cases, while it requires much `if (md->ma_keys == NULL)` checks.

History
Date	User	Action	Args
2019-03-14 08:04:29	methane	set	recipients: + methane, tim.peters, rhettinger, terry.reedy, vstinner, r.david.murray, Mark.Shannon, serhiy.storchaka, josh.r, xiang.zhang, louielu
2019-03-14 08:04:29	methane	set	messageid: <1552550669.15.0.283010949251.issue30040@roundup.psfhosted.org>
2019-03-14 08:04:29	methane	link	issue30040 messages
2019-03-14 08:04:29	methane	create