[Bug 1638695] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for python2.7 has
completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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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:
  Fix Released
Status in python2.7 source package in Zesty:
  Fix Committed

Bug description:
  SRU: Looks like only the math.o build without -fPIC makes it into the
  SRU. There shouldn't be any regression potential when building without
  -fPIC for the static interpreter.  Acceptance criteria is running the
  benchmarks and not showing any performance regressions.

  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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