Re: Very slow execution under Fedora 34

This is using valgrind compiled from GIT sources using my test program:

[alvarok@YELLOWJACKET tarea5]$ valgrind -v ./principal
==45395== Memcheck, a memory error detector
==45395== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==45395== Using Valgrind-3.18.0.GIT-1bee3ab757-20210901 and LibVEX; rerun
with -h for copyright info
==45395== Command: ./principal
==45395==
--45395-- Valgrind options:
--45395--    -v
--45395-- Contents of /proc/version:
--45395--   Linux version 5.13.13-200.fc34.x86_64 (
[email protected]) (gcc (GCC) 11.2.1 20210728 (Red
Hat 11.2.1-1), GNU ld version 2.35.2-5.fc34) #1 SMP Thu Aug 26 17:06:39 UTC
2021
--45395--
--45395-- Arch and hwcaps: AMD64, LittleEndian,
amd64-cx16-lzcnt-rdtscp-sse3-ssse3-avx-avx2-bmi-f16c-rdrand-rdseed
--45395-- Page sizes: currently 4096, max supported 4096
--45395-- Valgrind library directory: /usr/local/libexec/valgrind
--45395-- Reading syms from
/home/alvarok/Development/Skills/Prog2/Laboratorio/Tarea5/tarea5/principal
--45395-- Reading syms from /usr/lib64/ld-2.33.so
--45395-- Warning: cross-CU LIMITATION: some inlined fn names
--45395-- might be shown as UnknownInlinedFun
--45395-- Reading syms from /usr/local/libexec/valgrind/memcheck-amd64-linux
--45395--    object doesn't have a dynamic symbol table
--45395-- Scheduler: using generic scheduler lock implementation.
--45395-- Reading suppressions file:
/usr/local/libexec/valgrind/default.supp
==45395== embedded gdbserver: reading from
/tmp/vgdb-pipe-from-vgdb-to-45395-by-alvarok-on-YELLOWJACKET
==45395== embedded gdbserver: writing to
/tmp/vgdb-pipe-to-vgdb-from-45395-by-alvarok-on-YELLOWJACKET
==45395== embedded gdbserver: shared mem
/tmp/vgdb-pipe-shared-mem-vgdb-45395-by-alvarok-on-YELLOWJACKET
==45395==
==45395== TO CONTROL THIS PROCESS USING vgdb (which you probably
==45395== don't want to do, unless you know exactly what you're doing,
==45395== or are doing some strange experiment):
==45395==   /usr/local/libexec/valgrind/../../bin/vgdb --pid=45395
...command...
==45395==
==45395== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==45395==   /path/to/gdb ./principal
==45395== and then give GDB the following command
==45395==   target remote | /usr/local/libexec/valgrind/../../bin/vgdb
--pid=45395
==45395== --pid is optional if only one valgrind process is running
==45395==
--45395-- REDIR: 0x4025130 (ld-linux-x86-64.so.2:strlen) redirected to
0x580b31e2 (vgPlain_amd64_linux_REDIR_FOR_strlen)
--45395-- REDIR: 0x4024f00 (ld-linux-x86-64.so.2:index) redirected to
0x580b31fc (vgPlain_amd64_linux_REDIR_FOR_index)
--45395-- Reading syms from
/usr/local/libexec/valgrind/vgpreload_core-amd64-linux.so
--45395-- Reading syms from
/usr/local/libexec/valgrind/vgpreload_memcheck-amd64-linux.so
==45395== WARNING: new redirection conflicts with existing -- ignoring it
--45395--     old: 0x04025130 (strlen              ) R-> (0000.0)
0x580b31e2 vgPlain_amd64_linux_REDIR_FOR_strlen
--45395--     new: 0x04025130 (strlen              ) R-> (2007.0)
0x048463c0 strlen
--45395-- REDIR: 0x4021910 (ld-linux-x86-64.so.2:strcmp) redirected to
0x4847220 (strcmp)
--45395-- REDIR: 0x4025690 (ld-linux-x86-64.so.2:mempcpy) redirected to
0x484ac90 (mempcpy)
--45395-- Reading syms from /usr/lib64/libstdc++.so.6.0.29
--45395--   Considering
/usr/lib/debug/.build-id/bd/d633ff5da0bba64d19ecf277a9eed7001da127.debug ..
--45395--   .. build-id is valid
--45395--   Considering
/usr/lib/debug/.build-id/bd/../../../../../usr/lib/debug/usr/lib64/../../.dwz/gcc-11.2.1-1.fc34.x86_64
..
--45395--   .. build-id is valid
--45395-- Reading syms from /usr/lib64/libm-2.33.so
--45395--   Considering
/usr/lib/debug/.build-id/c1/784bbe8a93a6e62f74b16105a2076a03b398ac.debug ..
--45395--   .. build-id is valid
--45395-- Reading syms from /usr/lib64/libgcc_s-11-20210728.so.1
--45395--   Considering
/usr/lib/debug/.build-id/46/e10c9ee769c5cfc7cdb638e3ccbc3169c0a949.debug ..
--45395--   .. build-id is valid
--45395--   Considering
/usr/lib/debug/.build-id/46/../../../../../usr/lib/debug/lib64/../.dwz/gcc-11.2.1-1.fc34.x86_64
..
--45395--   .. build-id is valid
--45395-- Reading syms from /usr/lib64/libc-2.33.so
--45395--   Considering
/usr/lib/debug/.build-id/9d/e0f6e78ec16db4c6c167efc6b37466705edeff.debug ..
--45395--   .. build-id is valid
--45395--   Considering
/usr/lib/debug/.build-id/9d/../../../../../usr/lib/debug/lib64/../.dwz/glibc-2.33-20.fc34.x86_64
..
--45395--   .. build-id is valid
--45395-- REDIR: 0x4c6eee0 (libc.so.6:memmove) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
==45395== Preferring higher priority redirection:
--45395--     old: 0x04d41710 (__memcpy_avx_unalign) R-> (2018.0)
0x04848470 __memcpy_avx_unaligned_erms
--45395--     new: 0x04d41710 (__memcpy_avx_unalign) R-> (2018.1)
0x04849d10 memmove
--45395-- REDIR: 0x4c6e3e0 (libc.so.6:strncpy) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f220 (libc.so.6:strcasecmp) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6de90 (libc.so.6:strcat) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6e440 (libc.so.6:rindex) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c705d0 (libc.so.6:rawmemchr) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c88680 (libc.so.6:wmemchr) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c881c0 (libc.so.6:wcscmp) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f040 (libc.so.6:mempcpy) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6ee70 (libc.so.6:bcmp) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6e380 (libc.so.6:strncmp) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6df40 (libc.so.6:strcmp) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6efb0 (libc.so.6:memset) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c88180 (libc.so.6:wcschr) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6e2e0 (libc.so.6:strnlen) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6e020 (libc.so.6:strcspn) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f270 (libc.so.6:strncasecmp) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6dfc0 (libc.so.6:strcpy) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f3c0 (libc.so.6:memcpy@@GLIBC_2.14) redirected to
0x48351b6 (_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c898d0 (libc.so.6:wcsnlen) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c88200 (libc.so.6:wcscpy) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6e480 (libc.so.6:strpbrk) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6def0 (libc.so.6:index) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6e2a0 (libc.so.6:strlen) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c74a80 (libc.so.6:memrchr) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f2c0 (libc.so.6:strcasecmp_l) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6ee30 (libc.so.6:memchr) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c882d0 (libc.so.6:wcslen) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6e5a0 (libc.so.6:strspn) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f1c0 (libc.so.6:stpncpy) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f160 (libc.so.6:stpcpy) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c70610 (libc.so.6:strchrnul) redirected to 0x48351b6
(_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4c6f310 (libc.so.6:strncasecmp_l) redirected to
0x48351b6 (_vgnU_ifunc_wrapper)
--45395-- REDIR: 0x4d3e530 (libc.so.6:__strrchr_avx2) redirected to
0x4845e00 (rindex)
--45395-- REDIR: 0x4c6a100 (libc.so.6:malloc) redirected to 0x4840739
(malloc)
--45395-- REDIR: 0x490da50 (libstdc++.so.6:operator new(unsigned long))
redirected to 0x4840ea3 (operator new(unsigned long))
--45395-- REDIR: 0x490dab0 (libstdc++.so.6:operator new[](unsigned long))
redirected to 0x4842095 (operator new[](unsigned long))
--45395-- REDIR: 0x4d3e340 (libc.so.6:__strchrnul_avx2) redirected to
0x484a790 (strchrnul)
--45395-- REDIR: 0x4d416f0 (libc.so.6:__mempcpy_avx_unaligned_erms)
redirected to 0x484a8a0 (mempcpy)
1>Fin
--45395-- REDIR: 0x4d39bf0 (libc.so.6:__strcmp_avx2) redirected to
0x4847120 (strcmp)
--45395-- REDIR: 0x4d3e700 (libc.so.6:__strlen_avx2) redirected to
0x48462a0 (strlen)
Fin.
--45395-- REDIR: 0x4d3a560 (libc.so.6:__memchr_avx2) redirected to
0x48472a0 (memchr)
--45395-- REDIR: 0x4d41710 (libc.so.6:__memcpy_avx_unaligned_erms)
redirected to 0x4849d10 (memmove)
--45395-- REDIR: 0x490bd00 (libstdc++.so.6:operator delete(void*, unsigned
long)) redirected to 0x48436d3 (operator delete(void*, unsigned long))
--45395-- REDIR: 0x490bd20 (libstdc++.so.6:operator delete[](void*))
redirected to 0x48443f9 (operator delete[](void*))
--45395-- REDIR: 0x4c6a760 (libc.so.6:free) redirected to 0x4842f0e (free)
==45395==
==45395== HEAP SUMMARY:
==45395==     in use at exit: 0 bytes in 0 blocks
==45395==   total heap usage: 23 allocs, 23 frees, 75,192 bytes allocated
==45395==
==45395== All heap blocks were freed -- no leaks are possible
==45395==
==45395== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

On Sun, Sep 5, 2021 at 8:29 PM Alvaro Kuolas <[email protected]> wrote:

> Hello everyone!
>
> 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
> --23524-- Reading syms from /usr/lib64/libm-2.33.so
> --23524--   Considering
> /usr/lib/debug/.build-id/c1/784bbe8a93a6e62f74b16105a2076a03b398ac.debug ..
> --23524--   .. build-id is valid
> --23524-- Reading syms from /usr/lib64/libgcc_s-11-20210728.so.1
> --23524--   Considering
> /usr/lib/debug/.build-id/46/e10c9ee769c5cfc7cdb638e3ccbc3169c0a949.debug ..
> --23524--   .. build-id is valid
> --23524--   Considering
> /usr/lib/debug/.build-id/46/../../../../../usr/lib/debug/lib64/../.dwz/gcc-11.2.1-1.fc34.x86_64
> ..
> --23524--   .. build-id is valid
> --23524-- Reading syms from /usr/lib64/libc-2.33.so
> --23524--   Considering
> /usr/lib/debug/.build-id/9d/e0f6e78ec16db4c6c167efc6b37466705edeff.debug ..
> --23524--   .. build-id is valid
> --23524--   Considering
> /usr/lib/debug/.build-id/9d/../../../../../usr/lib/debug/lib64/../.dwz/glibc-2.33-20.fc34.x86_64
> ..
> --23524--   .. build-id is valid
>
> What could be the problem? GGC 11 perhaps?
>
> Thanks!
>

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