Hi,
Please provide the full list of events you are using.
Thanks.
On Dec 3, 2013 1:58 PM, "Binh Q. Pham" <phambinh1...@gmail.com> wrote:
> I am having a problem while using libpfm-4.4.0, which I think related to
> this question. What I see is that the number of instructions retired
> drops significantly if I add a few more events to the list of monitored
> events in my program. I suspect that the added events conflict with the
> existing ones, hence brings the actual count down. Do you have the same
> thoughts?
> Also, could you point me to where I can find information about these
> conflicting events in order to configure them correctly? How can I know
> how many performance counters that my CPU has?
>
> Thanks,
> Binh
> On 07/23/2013 02:22 AM, Stephane Eranian wrote:
> > Hi,
> >
> > On Tue, Jul 23, 2013 at 2:25 AM, Leonardo Piga <leonardo.p...@gmail.com>
> wrote:
> >> Hello,
> >>
> >> I am trying to measure some performance counters on Ivy Bridge, which
> has 4
> >> PCM. I would like to know if there is a way to group up counters so
> that I
> >> can measure events on the same time.
> >>
> >> For example, I need to measure 8 counters (e.g., A,B,C,D,E,F,G,H). And I
> >> would like to sample A,B,C,D together and E,F,G,H together.
> >>
> >> How can I do this using libpfm? I saw that task.c on perf_examples has
> a way
> >> to group up counters, but I couldn't use it.
> >>
> > task -e A,B,C,D -e E,F,G,H .....
> >
> > Of course in each group, events have to be compatible with each other.
> > That means they cannot conflict on a counter. If so then, try moving the
> > conflicting events to separate groups.
> >
> > Also a group cannot have more events than there are counters.
> > Note that by default the NMI watchdog uses one counter and runs
> > all the time unless you disable it via /proc/sys/kernel/nmi_watchdog.
> >
> >> Thank you for any help,
> >>
> >> --
> >> Leonardo
> >>
> >>
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>
> --
> -Binh
>
>
>
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