Re: [Perf] Adding timeout option

[Pádraig Brady]

On 10/21/2012 05:18 AM, abhishek agarwal wrote:

> perfmon had "timeout" option and i guess, same do oprofile.
>
> On Sat, Oct 20, 2012 at 1:58 AM, Pádraig Brady <P@xxxxxxxxxxxxxx> wrote:
> > On 10/13/2012 08:54 AM, abhishek agarwal wrote:
> > > Hi folks..
> > >
> > > I was thinking that why cant we have a timeout option in perf stat
> > > command.  The timeout feature will help us to profile a process for a
> > > stipulated time (preferably in millisecs) and make perf stat return
> > > after that time.
> > > Eg:
> > >
> > > perf stat --timeout=10 sleep 100
> > >
> > > This will make perf return and report stats after 10 ms...
> > >
> > > Hope anyone can shed some more light on the idea
> >
> >
> > It seems preferable to use the timeout program to do this.
> > Either sending a handled signal to the perf process like:
> >
> >      timeout -s HUP 10 perf stat sleep 100
> >
> > Or even better, just use that to kill the monitored process itself
> >
> >      perf stat timeout 10 sleep 100

> sleep does not offer a good timeout resolution and it is not a good
> option (according to me) either.

sleep was just following on the command example.
timeout(1) supports subsecond resolution,
through timer_create (CLOCK_REALTIME...) and
timeout indication through signals.

thanks,
Pádraig.
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