Re: I.2 - Grouping

[Corey Ashford]

stephane eranian wrote:
> On Tue, Jun 23, 2009 at 10:26 AM, Paul Mackerras<paulus@xxxxxxxxx> wrote:
> > stephane eranian writes:
> >
> > > What happens if I do:
> > >    fd0 = perf_counter_open(&hwc1, getpid(), -1, -1, 0);
> > >    fd1 = perf_counter_open(&hwc2, getpid(), -1, fd0, 0);
> > >
> > > And then:
> > >    fd2 = perf_counter_open(&hwc2, getpid(), -1, fd1, 0);
> > That perf_counter_open call will fail with an EINVAL error because fd1
> > is not a group leader.
> Okay. Thanks.
>
> But that leads me to another question related to grouping
> which was hinted for by Peter's comment about IBS.
>
> Can you have multiple sampling events in a group?

There's a PAPI ctest which exercises this - profile_two_events - and it 
does work with the PCL substrate.

- Corey


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