Re: [Valgrind-users] Very slow execution under Fedora 34

[Alvaro K. <ku...@gm...>]

My program is very simple: they are exercises from a course about ADT
(Abstract Data Types).

On Sun, Sep 5, 2021 at 11:24 PM John Borland <
all...@gm...> wrote:

> if you have a lot of threads you can try the fair scheduler flag.
>
> On Sun, Sep 5, 2021, 8:59 PM John Reiser <jr...@bi...> 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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