Message 294749 - Python tracker

Message294749

Author	vstinner
Recipients	pitrou, serhiy.storchaka, vstinner
Date	2017-05-30.11:01:51
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1496142111.35.0.411946848363.issue30509@psf.upfronthosting.co.za>
In-reply-to

Content
> I have other patch that makes `a + b` yet tens percents faster, faster than `a.__add__(b)`, by adding functions and declarations that are never used. Confusing. It seems like you are a victim of the "deadcode" issue related to code locality: https://haypo.github.io/journey-to-stable-benchmark-deadcode.html To run microbenchmarks on such very tiny functions taken less than 200 ns, it's more reliable to compile Python using LTO+PGO.

Content

> I have other patch that makes `a + b` yet tens percents faster, faster than `a.__add__(b)`, by adding functions and declarations that are never used. Confusing.

It seems like you are a victim of the "deadcode" issue related to code locality:
https://haypo.github.io/journey-to-stable-benchmark-deadcode.html

To run microbenchmarks on such very tiny functions taken less than 200 ns, it's more reliable to compile Python using LTO+PGO.

History
Date	User	Action	Args
2017-05-30 11:01:51	vstinner	set	recipients: + vstinner, pitrou, serhiy.storchaka
2017-05-30 11:01:51	vstinner	set	messageid: <1496142111.35.0.411946848363.issue30509@psf.upfronthosting.co.za>
2017-05-30 11:01:51	vstinner	link	issue30509 messages
2017-05-30 11:01:51	vstinner	create