Re: [Valgrind-developers] how to ask valgrind about amount of memory taken by the process?

[Konstantin S. <kon...@gm...>]

On Tue, Oct 13, 2009 at 5:54 PM, John Reiser <jr...@bi...> wrote:
>
> > I need to know how much memory is taken by a valgrind process from
> > inside that process. And I need it to be fast.
>
> How fast?
>
> > One option is to read /proc/self/status and extract the VmSize field.
> > Slow, bad.
>
> Doing a pread(,,,0) and parsing the result via strstr+atoi should take
> about 1 microsecond.

Hm. Perhaps.
I did not think about opening this file for the duration of the run... :)
I need to check the occupied memory very often so that the tool can
react accordingly when the memory is close to its limit.
pread+strstr+atoi might be fast enough. Need to check...

>
> Open /proc/self/status once at the beginning,
> and keep it open for the zillions of calls you'll be making.
> Or does pread fail for files in /proc?
>
> > Another option is to keep track of valgrind's VG(malloc) and users's
> > malloc, etc. Easy to loose something, bad.


>
> If you do not trust valgrind internal code then why run it at all?

Is there such functionality in valgrind core already?
I need to get the number very close to the one in /proc/self/status:VmSize


Thanks!
--kcc
>
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