On 2 March 2017 at 07:00, Victor Stinner <victor.stinner@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.

Nick Coghlan | ncoghlan@gmail.com | Brisbane, Australia