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Re: [gnugo-devel] weird performance problem
From: |
Paul Pogonyshev |
Subject: |
Re: [gnugo-devel] weird performance problem |
Date: |
Fri, 16 Apr 2004 13:49:55 +0300 |
User-agent: |
KMail/1.6.50 |
Arend wrote:
>
> Tracking back some spurious 50% slowdowns for regression runs,
> I found out (with oprofile) that 50% of CPU time was spent in libc.
> Not completely reproducable, however. In particular, I cannot
> reproduce it when linked against libc_p (profiled version) instead of
> libc.
>
> According to top, gnugo is running with over 90% of CPU time, so
> it should be caused by gnugo.
> Does anybody have any idea what could cause this? Below is a flat
> profile of libc during such a run (according to oprofile). An update
> from SuSE 8.2 to 9.0 didn't solve the problem.
>
> Arend
>
>
> Profiling through timer interrupt
> samples % symbol name
> 6769 86.3393 __mcount_internal
> 665 8.4821 mcount
> 189 2.4107 __i686.get_pc_thunk.bx
> 170 2.1684 memset
> 27 0.3444 memcpy
> 6 0.0765 _int_malloc
> 3 0.0383 __GI___mbrtowc
> 2 0.0255 _int_free
> 1 0.0128 __GI___gettimeofday_internal
> 1 0.0128 __GI__dl_mcount_wrapper_check
> 1 0.0128 __malloc
> 1 0.0128 __realloc
> 1 0.0128 _int_realloc
> 1 0.0128 _nl_explode_name
> 1 0.0128 _nl_make_l10nflist
> 1 0.0128 index
> 1 0.0128 strlen
This is not very helpful. Can't say anything without call tree.
Btw, `libc' is not `glibc' i.e. not GNU libc, right?
Paul
- [gnugo-devel] weird performance problem, Arend Bayer, 2004/04/16
- Re: [gnugo-devel] weird performance problem,
Paul Pogonyshev <=
- Re: [gnugo-devel] weird performance problem, Arend Bayer, 2004/04/16
- Re: [gnugo-devel] weird performance problem, Paul Pogonyshev, 2004/04/16
- Re: [gnugo-devel] weird performance problem, Arend Bayer, 2004/04/16
- Re: [gnugo-devel] weird performance problem, Paul Pogonyshev, 2004/04/16
- Re: [gnugo-devel] weird performance problem, Arend Bayer, 2004/04/16
- Re: [gnugo-devel] weird performance problem, Paul Pogonyshev, 2004/04/16
- [gnugo-devel] oprofile, Arend Bayer, 2004/04/18
- Re: [gnugo-devel] oprofile, Gunnar Farneback, 2004/04/18
- Re: [gnugo-devel] oprofile, Evan Daniel, 2004/04/18
- Re: [gnugo-devel] oprofile, Arend Bayer, 2004/04/20