Hi,
On Thu, Dec 01, 2011 at 08:37:57AM +0100, Ulrich Windl wrote:
> >>> Dejan Muhamedagic <deja...@fastmail.fm> schrieb am 30.11.2011 um 15:35 in
> Nachricht <20111130143512.GB6964@walrus.homenet>:
> > Hi,
> >
> > On Wed, Nov 30, 2011 at 02:56:34PM +0100, Ulrich Windl wrote:
> > > Hi!
> > >
> > > It seems the execution time is shown in milliseconds. However it seems
> > > all
> > execution times are multiples of 10ms. Is that intended?
> > >
> > > Examples (human readable times):
> > > exec-time="0"
> > > exec-time="100ms"
> > > exec-time="10ms"
> > > exec-time="70ms"
> > > exec-time="70ms"
> > > exec-time="70ms"
> > > exec-time="710ms"
> > > exec-time="710ms"
> > > exec-time="7s500ms"
> > > exec-time="80ms"
> > > exec-time="820ms"
> > > exec-time="850ms"
> > > exec-time="870ms"
> > > exec-time="880ms"
> > > exec-time="90ms"
> > > exec-time="910ms"
> > > exec-time="910ms"
> >
> > That's the clock resolution (10ms) for this purpose. I think it's
> > platform dependent, but I cannot recall seeing anything with
> > finer resolution (see _SC_CLK_TCK)
>
> Hi!
>
> I don't know how you measure your runtime, but even gettimeofday() has a
> better resolution. Is that exec-time the wall-time, or is it CPU-time?
>
> I don't think it makes much sense to use CPU-time there.
>
> Even then, I cannot reproduce the result:
> "CPU time used = 0.004" says the following program:
>
> #include <stdio.h>
> #include <string.h>
> #include <sys/time.h>
> #include <sys/resource.h>
>
> static int get_cpu_usage(struct timeval *tvp)
> {
> struct rusage res;
>
> if ( getrusage(RUSAGE_SELF, &res) != 0 )
> return(-1);
> tvp->tv_sec = res.ru_utime.tv_sec;
> tvp->tv_usec = res.ru_utime.tv_usec;
> return(0);
> }
>
> int main(int argc, char *argv[])
> {
> struct timeval tv, now;
>
> if (get_cpu_usage(&tv) == 0) {
> while (get_cpu_usage(&now) == 0 &&
> memcmp(&tv, &now, sizeof(tv)) == 0) {
> }
> now.tv_usec -= tv.tv_usec;
> now.tv_sec -= tv.tv_sec;
> if (now.tv_usec < 0)
> now.tv_usec += 1000000, now.tv_sec -= 1;
> printf("CPU time used = %g\n",
> now.tv_sec + (double) now.tv_usec / 1000000);
> }
> return 0;
> }
>
> So what are you doing here?
I'm not sure :) You seem to be very proficient at programming,
why don't then just take a look at the code in glue/clplumbing.
Search for exec_time.
Thanks,
Dejan
> Regards,
> Ulrich
>
>
>
>
> _______________________________________________
> Linux-HA mailing list
> Linux-HA@lists.linux-ha.org
> http://lists.linux-ha.org/mailman/listinfo/linux-ha
> See also: http://linux-ha.org/ReportingProblems
_______________________________________________
Linux-HA mailing list
Linux-HA@lists.linux-ha.org
http://lists.linux-ha.org/mailman/listinfo/linux-ha
See also: http://linux-ha.org/ReportingProblems
