linux-kernel - Re: [PATCH v6 2/2] perf stat: add interval printing

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Message-ID: <20130124093907.GA24621@gmail.com>
Date:	Thu, 24 Jan 2013 10:39:07 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, jolsa@...hat.com,
	namhyung.kim@....com
Subject: Re: [PATCH v6 2/2] perf stat: add interval printing


* Stephane Eranian <eranian@...gle.com> wrote:

> This patch adds a new printing mode for perf stat.
> It allows internval printing. That means perf stat

s/rnv/rv

> can now print event deltas at regular time interval.
> This is useful to detect phases in programs.
> 
> The -I option enables interval printing. It expects
> an interval duration in milliseconds. Minimum is
> 100ms. Once, activated perf stat prints events deltas
> since last printout. All modes are supported.
> 
> $ perf stat -I 1000 -e cycles noploop 10
> noploop for 10 seconds
>  #           time             counts events
>       1.000109853      2,388,560,546 cycles
>       2.000262846      2,393,332,358 cycles
>       3.000354131      2,393,176,537 cycles
>       4.000439503      2,393,203,790 cycles
>       5.000527075      2,393,167,675 cycles
>       6.000609052      2,393,203,670 cycles
>       7.000691082      2,393,175,678 cycles

Looks useful!

Thanks,

	Ingo
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