[Bug 1965451] [NEW] C++ performance got worse going from Ubuntu 20 to Ubuntu 21

[Peter Taraba]

Public bug reported:

This is not a bug, more of a degradation of performance report.

Going from Ubuntu 20 to Ubuntu 21 (and same on Ubuntu 22 pre-release), I
noticed that C++ performance got worse, while it stayed the same for
pypy:

Ubuntu 21:
pypy	1.419s	1.387s	8.527%	2.469%
c++	1.843s	1.719s	8.935%	2.465%

Ubuntu 20:
PyPy	1.410s	1.389s	8.463%	2.290%
C++	1.588s	1.507s	8.781%	2.284%

details:
https://www.frisky.world/2022/03/what-happened-to-c-performance-going.html

software I use:
https://github.com/pepe78/python-performance

** Affects: gcc-11 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: performance

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https://bugs.launchpad.net/bugs/1965451

Title:
  C++ performance got worse going from Ubuntu 20 to Ubuntu 21

Status in gcc-11 package in Ubuntu:
  New

Bug description:
  This is not a bug, more of a degradation of performance report.

  Going from Ubuntu 20 to Ubuntu 21 (and same on Ubuntu 22 pre-release),
  I noticed that C++ performance got worse, while it stayed the same for
  pypy:

  Ubuntu 21:
  pypy	1.419s	1.387s	8.527%	2.469%
  c++	1.843s	1.719s	8.935%	2.465%

  Ubuntu 20:
  PyPy	1.410s	1.389s	8.463%	2.290%
  C++	1.588s	1.507s	8.781%	2.284%

  details:
  https://www.frisky.world/2022/03/what-happened-to-c-performance-going.html

  software I use:
  https://github.com/pepe78/python-performance

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