linux-kernel - Re: [PATCH] perf, tools: Support spark lines in perf stat v2

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Message-ID: <87ppjh4vqf.fsf@tassilo.jf.intel.com>
Date:	Tue, 13 May 2014 07:08:24 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	acme@...radead.org, linux-kernel@...r.kernel.org,
	eranian@...gle.com, namhyung@...nel.org, jolsa@...hat.com
Subject: Re: [PATCH] perf, tools: Support spark lines in perf stat v2

Peter Zijlstra <peterz@...radead.org> writes:
>
> Hmm, my first looking at the spark thingies interpreted them as a
> histogram. But they're not really.

It's a histogram of variance.

> Would it be possible to make it a histogram of -2sigma,2sigma around the
> avg value? That way you can plot all data and get a good idea of the
> distribution. I'd suggest using 9 buckets for it.

I doubt that would work well with only ~8 values.
This would need multiple lines or a real plotter,
otherwise you would have all kinds of odd corner cases.

Sparklines are much better for limited space.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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