linux-kernel - Re: [PATCH] perf, tools: Make perf stat -I ... CSV output flat

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Date:	Wed, 13 Mar 2013 12:49:29 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools: Make perf stat -I ... CSV output flat

Em Wed, Mar 13, 2013 at 02:19:05PM +0100, Stephane Eranian escreveu:
> On Thu, Mar 7, 2013 at 3:43 AM, Andi Kleen <andi@...stfloor.org> wrote:
> >
> > +       if (interval && csv_output) {
> > +               fprintf(output, "time,,");
> 
> Don't quite understand the point of the ,,. By definition this
> extension is used for automatic
> post-processing. I cannot find a good justification for the
> double-comma, except for making

Yeah, that and the trailing comma as well, don't think they are needed.

> reading the output easy. But that's contradictory with the gnuplot goal.
> Also you need to add a # in front of this line to mark the line so it
> can be discarded (as comment)
> by any post-processing parser (such as gnuplot).
> 
> 
> Also I think something needs to be improved for the non-aggregated output
> in system-wide mode:
> 
> $ perf stat -I 10000 -x, -a -A -e cycles,instructions sleep 5
> 
> Don't you want events also grouped by CPU?
> 
> 
> Also noticed a bunch of trailing white spaces.

I fixed those in the updated patch I sent.
 
> I am not opposed to the idea of the patch, I think it is indeed useful
> for post-processing tools.

yeah
 
- Arnaldo
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