Re: Very slow execution under Fedora 34

I opened a bug report

https://bugs.kde.org/show_bug.cgi?id=442061

I have attached perf-record data

Thanks for your help!

On Sun, Sep 5, 2021 at 10:59 PM John Reiser <[email protected]> wrote:

> > I am running valgrind on my PC with dual boot Windows 10 and Fedora 34.
> >
> > Running the same test on Ubuntu 20.04 (under Windows 10 WSL2) valgrind
> runs in less than a second, but on Fedora 34 is very slow, several minutes
> slow.
> >
> > On Fedora 34 it looks like the time spent is reading symbols.
> >
> > This is the part that takes most of the time:
> >
> > --23524-- Reading syms from /usr/lib64/libstdc++.so.6.0.29
> > --23524--   Considering
> /usr/lib/debug/.build-id/bd/d633ff5da0bba64d19ecf277a9eed7001da127.debug ..
> > --23524--   .. build-id is valid
> > --23524--   Considering
> /usr/lib/debug/.build-id/bd/../../../../../usr/lib/debug/usr/lib64/../../.dwz/gcc-11.2.1-1.fc34.x86_64
> ..
> > --23524--   .. build-id is valid
> [[snip]]
> >
> > What could be the problem? GGC 11 perhaps?
>
> There have been some hints of trouble with the DWARF-5 symbol reader.
> Thus a work-around might be to avoid DWARF-5 by using an older gcc.
>
> If you can, please run "perf record" and then "perf report",
> and copy+paste (or attach) info into a Bug Report (see
> https://valgrind.org).
> Then post the bug link here with a teaser.
>
>
>
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