Message 186007 - Python tracker

Message186007

Author	pitrou
Recipients	pitrou, serhiy.storchaka, vstinner
Date	2013-04-04.06:21:07
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1365056467.35.0.93204293438.issue17628@psf.upfronthosting.co.za>
In-reply-to

Content
> I don't understand why the patch makes the comparaison much slower, > since most time is supposed to be spend in memcmp()? Because reading the last character evicts useful data from the CPU cache, just before memcmp() reads it again from memory? In other words, I'm not convinced this is a useful heuristic.

Content

> I don't understand why the patch makes the comparaison much slower,
> since most time is supposed to be spend in memcmp()?

Because reading the last character evicts useful data from the CPU cache, just before memcmp() reads it again from memory?

In other words, I'm not convinced this is a useful heuristic.

History
Date	User	Action	Args
2013-04-04 06:21:07	pitrou	set	recipients: + pitrou, vstinner, serhiy.storchaka
2013-04-04 06:21:07	pitrou	set	messageid: <1365056467.35.0.93204293438.issue17628@psf.upfronthosting.co.za>
2013-04-04 06:21:07	pitrou	link	issue17628 messages
2013-04-04 06:21:07	pitrou	create