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Re: change the sampling time in the gprof

From: Ian Lance Taylor <ian at wasabisystems dot com>
To: Zack Weinberg <zack at codesourcery dot com>
Cc: <perugupa at csee dot wvu dot edu>, <gcc at gcc dot gnu dot org>
Date: 18 May 2004 14:56:57 -0400
Subject: Re: change the sampling time in the gprof
References: <33848.157.182.195.254.1084202299.squirrel@www.csee.wvu.edu><40A41F0F.4080806@specifixinc.com><3864.157.182.194.141.1084903782.squirrel@www.csee.wvu.edu><m38yfpy467.fsf@gossamer.airs.com><87wu39lgk0.fsf@taltos.codesourcery.com>

Zack Weinberg <zack@codesourcery.com> writes:

> Ian Lance Taylor <ian@wasabisystems.com> writes:
> 
> > On typical Unix systems, as well as on GNU/Linux, the precision of the
> > gprof timer is determined by the behaviour of the profil() function.
> > I don't know whether there is any way to adjust that on your
> > particular system.
> 
> Linux (the kernel) does not implement profil().  glibc uses
> setitimer() and SIGPROF for profiling.

Yeah, I was somewhat ambiguous.  glibc does use the profil function,
but as you say the function is not in the kernel.  It is just another
part of glibc.

Ian

References:
- HELP: GCC Passes and Files
  - From: perugupa
- Re: HELP: GCC Passes and Files
  - From: Jim Wilson
- change the sampling time in the gprof
  - From: perugupa
- Re: change the sampling time in the gprof
  - From: Ian Lance Taylor
- Re: change the sampling time in the gprof
  - From: Zack Weinberg

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