linux-kernel - Re: Add top down metrics to perf stat

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Date:	Fri, 20 May 2016 11:59:54 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, peterz@...radead.org, jolsa@...nel.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: Add top down metrics to perf stat

On Thu, May 19, 2016 at 04:51:30PM -0700, Andi Kleen wrote:
> On Mon, May 16, 2016 at 02:58:38PM +0200, Jiri Olsa wrote:
> > On Fri, May 13, 2016 at 06:44:49PM -0700, Andi Kleen wrote:
> > 
> > SNIP
> > 
> > >     
> > > The formulas to compute the metrics are generic, they
> > > only change based on the availability on the abstracted
> > > input values.
> > >     
> > > The kernel declares the events supported by the current
> > > CPU and perf stat then computes the formulas based on the
> > > available metrics.
> > > 
> > > 
> > > Example output:
> > > 
> > > $ perf stat --topdown -I 1000 cmd
> > >      1.000735655                   frontend bound       retiring             bad speculation      backend bound        
> > >      1.000735655 S0-C0           2    47.84%              11.69%               8.37%              32.10%           
> > >      1.000735655 S0-C1           2    45.53%              11.39%               8.52%              34.56%           
> 
> Hi Jiri,
> > 
> > you've lost first 3 header lines (time/core/cpus):
> > 
> > [jolsa@...-x3650m4-01 perf]$ sudo ./perf stat --per-core -e cycles -I 1000 -a
> > #           time core         cpus             counts unit events
> >      1.000310344 S0-C0           2      3,764,470,414      cycles                                                      
> >      1.000310344 S0-C1           2      3,764,445,293      cycles                                                      
> >      1.000310344 S0-C2           2      3,764,428,422      cycles                                                      
> 
> I can't reproduce that.
> 

I can.. your latest code does not display headers: 'time' 'core' 'cpus'
also the initial '#'

[jolsa@...-x3650m4-01 perf]$ sudo ./perf stat --topdown -I 1000 -a
nmi_watchdog enabled with topdown. May give wrong results.
Disable with echo 0 > /proc/sys/kernel/nmi_watchdog
     1.002097350                   retiring             bad speculation      frontend bound       backend bound        
     1.002097350 S0-C0           2     38.1%                0.0%               59.2%                2.7%           
     1.002097350 S0-C1           2     38.1%                0.1%               59.7%                2.1%           


thanks,
jirka