Hello, Le 03/03/2017 à 08:27, Nick Coghlan a écrit : > On 2 March 2017 at 07:00, Victor Stinner <victor.stin...@gmail.com > <mailto:victor.stin...@gmail.com>> wrote: > > Hi, > > Your document doesn't explain how you configured the host to run > benchmarks. Maybe you didn't tune Linux or anything else? Be careful > with modern hardware which can make funny (or not) surprises. > > > Victor, do you know if you or anyone else has compared the RHEL/CentOS 7.x > binaries (Python 2.7.5 + patches, built with GCC 4.8.x) with the Fedora 25 > binaries (Python 2.7.13 + patches, built with GCC 6.3.x)? > > I know you've been using perf to look for differences between *Python* major > versions, but this would be more about using Python's benchmark suite to > investigate the performance of *gcc*, since it appears that may be the > culprit here. > > Cheers, > Nick.
Out of curiosity, I ran the set of benchmarks in two LXC containers running centos7 (2.7.5 + gcc 4.8.5) and Fedora 25 (2.7.13 + gcc 6.3.x). The benchmarks do run faster in 18 benchmarks, slower on 12 and insignificant for the rest (~33 from memory). Do take into account that this is run on baremetal system running an Ubuntu kernel (4.4.0-59) so this is by no mean a reference value but just for a quick test. Results were appended to the spreadsheet referred to in the analysis document. It is somewhat coherent with a previous test I ran where I disabled PGO on 2.7.6+gcc4.8 (Trusty). This made the 2.7.6+gcc4.8 (Trusty) interpreter to become slower than the Xenial reference. Unfortunately, I cannot redeploy my server on RHEL or Fedora at the moment so this is as far as I can go. Kind regards, ...Louis -- Louis Bouchard Software engineer, Cloud & Sustaining eng. Canonical Ltd Ubuntu developer Debian Maintainer GPG : 429D 7A3B DD05 B6F8 AF63 B9C4 8B3D 867C 823E 7A61 _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com