06.07.2018 17:26, Neal Gompa пишет:
On Fri, Jul 6, 2018 at 10:12 AM Aliaksandr Zaitsau <zamazan4ik@xxxxxx> wrote:
Hello.
As far as I know binaries in Fedora repositories are compiled without
PGO (profile-guided optimization). Also I don't know any LInux-based OS
where binaries are precompiled with PGO. With PGO we can improve
performance of binaries for typical use-cases without compiling for some
specific architecture (so binaries with PGO will be
architecture-independent).
Question: why PGO isn't used by maintainers for packages? Lack of
profile data for compilation with PGO? Isn't interested for
mainatainers? Something else? Will you try to use PGO for your packages,
if will be available repository with profile data for different
applications, where you can pick profile data for your application,
recompile package with this information and, probably, increase
performance of your application?
Some packages in Fedora _are_ compiled with PGO. Off the top of my
head, both Firefox and Python 3 are, but only for the x86
architectures. It takes too long for other architectures.
I don't know if there's significant demonstrative benefit across the
board for PGO, given the additional time it adds to package builds...
Hmm.. Sounds interesting. If some packages are built with PGO, so which
profiling information is used for compilation with PGO? Maintainers
manually collect it or take this information from some source?
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