Thanks Stephane. That works for me.
On Mon, Sep 9, 2013 at 6:58 PM, Stephane Eranian <eran...@googlemail.com>wrote:
> Hi,
>
> I get the same thing with my own little multithreaded benchmark.
>
> I think it has to do with what happens in per-thread/per-cpu mode
> with inheritance. I think each events of the child threads are propagated
> to each parent. I get 12x the amount on my 12 CPUs workstation.
> If you drop -i in task_cpu, then you only capture one thread's execution
> across all the CPUs.
>
> In per-thread mode + inehritance + cpu, it seems the kernel aggregates
> per PID and not per TID. Not sure this was intended.
>
> I think for what you are after, you need to get system-wide with per
> CPU breakdown:
>
> $ perf stat -a -A -e instructions ./binary
>
> Then the counts will add up.
>
>
>
> On Mon, Sep 9, 2013 at 6:44 PM, Bhavishya Goel <bhavishya.g...@gmail.com>
> wrote:
> > Yes, that's what I am doing. Below is an example of the counts I get from
> > task vs task_cpu from a 4-threaded binary:
> >
> > $> task -i -e INSTRUCTIONS_RETIRED ./binary
> >
> > 27 708 362 452 INSTRUCTIONS_RETIRED
> >
> > $> task_cpu -i -e INSTRUCTIONS_RETIRED ./binary
> > CPU0 29 529 250 689 INSTRUCTIONS_RETIRED
> >
> > CPU1 26 991 683 307 INSTRUCTIONS_RETIRED
> >
> > CPU2 24 404 405 488 INSTRUCTIONS_RETIRED
> >
> > CPU3 30 442 586 081 INSTRUCTIONS_RETIRED
> >
> > Adding up the task_cpu counts from all 4 CPUs will give me instructions
> > retired count which is almost four times of what I get from task. And I
> know
> > the count from task is correct because this is very close to what I get
> from
> > Intel PCM-TSX tool. Can you tell me what am I doing wrong?
> >
> >
> >
> > On Mon, Sep 9, 2013 at 4:46 PM, Stephane Eranian <eran...@googlemail.com
> >
> > wrote:
> >>
> >> On Mon, Sep 9, 2013 at 4:35 PM, Bhavishya Goel <
> bhavishya.g...@gmail.com>
> >> wrote:
> >> > It is multi-threaded.
> >> >
> >> >
> >> Then you need to add up all the counts from all the CPUs.
> >>
> >> > On Mon, Sep 9, 2013 at 4:26 PM, Stephane Eranian
> >> > <eran...@googlemail.com>
> >> > wrote:
> >> >>
> >> >> On Tue, Sep 3, 2013 at 8:51 AM, Bhavishya Goel
> >> >> <bhavishya.g...@gmail.com>
> >> >> wrote:
> >> >> > Hi,
> >> >> >
> >> >> > I am using "task_cpu" example in perf_examples folder of libpfm4.4
> >> >> > (linux
> >> >> > kernel 3.11-rc7, micrarchitecture: haswell). The counter numbers
> that
> >> >> > I
> >> >> > get
> >> >> > from task_cpu seem to be wrong as they are vastly different than
> what
> >> >> > I
> >> >> > get
> >> >> > from "task" example and Intel's PCM-TSX tool. This is an example of
> >> >> > command
> >> >> > line I use:
> >> >> >
> >> >> > task_cpu -i -e INSTRUCTIONS_RETIRED ./binary
> >> >> >
> >> >> > task -i -e INSTRUCTIONS_RETIRED ./binary
> >> >> >
> >> >> > The counter numbers from task_cpu are almost double of numbers from
> >> >> > task.
> >> >> > While, the numbers from PCM-TSX match the numbers from task. Is it
> a
> >> >> > bug
> >> >> > of
> >> >> > am I doing something wrong?
> >> >> >
> >> >> Sorry for late reply.
> >> >> Is your binary multi-process or multi-thread?
> >> >>
> >> >> > --
> >> >> > ಠ_ಠ
> >> >> >
> >> >> >
> >> >> >
> >> >> >
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> >> >
> >> >
> >> >
> >> >
> >> > --
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> >
> >
> >
> >
> > --
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>
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