[Python-Dev] Help requested with Python 2.7 performance regression (original) (raw)

INADA Naoki songofacandy at gmail.com
Thu Mar 2 04:11:27 EST 2017

On Thu, Mar 2, 2017 at 4:07 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

On Wed, 1 Mar 2017 19:58:14 +0100 Matthias Klose <doko at ubuntu.com> wrote:

On 01.03.2017 18:51, Antoine Pitrou wrote: > As for the high level: what if the training set used for PGO in Xenial > has become skewed or inadequate?

running the testsuite I did some tests a year or two ago, and running the whole test suite is not a good idea, as coverage varies wildly from one functionality to the other, so PGO will not infer the right information from it. You don't get very good benchmark results from it. (for example, decimal has an extensive test suite which might lead PGO to believe that code paths exercised by the decimal module are the hottest ones) Regards Antoine.

FYI, there are "profile-opt" make target. It uses subset of regrtest. https://github.com/python/cpython/blob/2.7/Makefile.pre.in#L211-L214

Does Ubuntu (and Debian) use it?

More information about the Python-Dev mailing list