Re: HELP: Change the sampling time in gprof

[Ian Lance Taylor <ian at wasabisystems dot com>]

Nick Clifton <nickc@redhat.com> writes:

> Hi Ranganarth,
> 
> > I am working on debian linux 2.4.24-1-smp kernal
> 
> On an x86 ?  An AMD64 ?  An alpha ? ....
> 
> >>  1. Alter the profil() function in your OS.
> 
> > I may not be able to chage the profiler at this stage, so I will go for
> > the first option. can you tell me how to change the profil() function.is
> > this the function i have to change in this environment or is there some
> > thing else i should take care of.
> 
> Sorry this is a Linux kernel issue which is way beyond my limited
> knowledge.  Basically you will want to find the sources for the
> profil() function in the kernel and then examine them to see if you
> can change the sampling frequency.  You will then have to rebuild your
> kernel with this changed function in it before you can start
> generating profiles with greater frequency samples.

Actually, on GNU/Linux, profil is part of glibc.  It's not a kernel
system call.

You should talk to the glibc people.

Ian