The profile guided optimizations, previously enabled only for the x86_64 architecture, have been also enabled for the aarch64, ppc64le and s390x architectures.
Description of problem:
Our current Python3 packages are built without "Expensive" (e.g. LTO, PGO) optimizations enabled. There's a section in specfile that looks like this:
$ grep -A7 Expensive python3.spec
# Expensive optimizations (mainly, profile-guided optimizations)
%ifarch %{ix86} x86_64
%bcond_without optimizations
%else
# On some architectures, the optimized build takes tens of hours, possibly
# longer than Koji's 24-hour timeout. Disable optimizations here.
%bcond_with optimizations
%endif
Where apparently we don't turn on these performance optimizations for aarch64, but only for x86, however allegedly the perf benefit would be 30%! We should thus consider urgently enabling these performance features if the builds aren't negatively impacted in terms of build time, etc.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2020:1764
Description of problem: Our current Python3 packages are built without "Expensive" (e.g. LTO, PGO) optimizations enabled. There's a section in specfile that looks like this: $ grep -A7 Expensive python3.spec # Expensive optimizations (mainly, profile-guided optimizations) %ifarch %{ix86} x86_64 %bcond_without optimizations %else # On some architectures, the optimized build takes tens of hours, possibly # longer than Koji's 24-hour timeout. Disable optimizations here. %bcond_with optimizations %endif Where apparently we don't turn on these performance optimizations for aarch64, but only for x86, however allegedly the perf benefit would be 30%! We should thus consider urgently enabling these performance features if the builds aren't negatively impacted in terms of build time, etc.