This bug was fixed in the package python2.7 - 2.7.14~rc1-3ubuntu1
---------------
python2.7 (2.7.14~rc1-3ubuntu1) artful; urgency=medium
* Regenerate the _PyFPE breaks list for Ubuntu.
-- Matthias Klose <d...@ubuntu.com> Tue, 05 Sep 2017 20:19:52 +0200
** Changed in: python2.7 (Ubuntu)
Status: Confirmed => Fix Released
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1638695
Title:
Python 2.7.12 performance regression
Status in python2.7 package in Ubuntu:
Fix Released
Status in python2.7 source package in Xenial:
Confirmed
Bug description:
I work on the OpenStack-Ansible project and we've noticed that testing
jobs on 16.04 take quite a bit longer to complete than on 14.04. They
complete within an hour on 14.04 but they normally take 90 minutes or
more on 16.04. We use the same version of Ansible with both versions
of Ubuntu.
After more digging, I tested python performance (using the
'performance' module) on 14.04 (2.7.6) and on 16.04 (2.7.12). There
is a significant performance difference between each version of
python. That is detailed in a spreadsheet[0].
I began using perf to dig into the differences when running the python
performance module and when using Ansible playbooks. CPU migrations
(as measured by perf) are doubled in Ubuntu 16.04 when running the
same python workloads.
I tried changing some of the kerne.sched sysctl configurables but they
had very little effect on the results.
I compiled python 2.7.12 from source on 14.04 and found the
performance to be unchanged there. I'm not entirely sure where the
problem might be now.
We also have a bug open in OpenStack-Ansible[1] that provides
additional detail. Thanks in advance for any help you can provide!
[0]
https://docs.google.com/spreadsheets/d/18MmptS_DAd1YP3OhHWQqLYVA9spC3xLt4PS3STI6tds/edit?usp=sharing
[1] https://bugs.launchpad.net/openstack-ansible/+bug/1637494
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