linux-kernel - Re: logging server C-state time?

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Message-ID: <20081103115952.69276f61@linux.intel.com>
Date:	Mon, 3 Nov 2008 11:59:52 -0800
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Chris Snook <csnook@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: logging server C-state time?

On Mon, 03 Nov 2008 14:47:52 -0500
Chris Snook <csnook@...hat.com> wrote:

> Hey folks --
> 
> I'm interested in logging the amount of time that server CPUs spend
> in various C-states over the course of a complicated job, ideally in
> a manner I could sync up with output from sysstat tools.  So far all
> the tools I've seen for power monitoring seem to be targeted to
> laptops and interactive use, but I'm looking for something that's
> scriptable and doesn't need ACPI battery information, even if that
> means relying on indirect measurements of power use like C-states.
> Any suggestions?

powertop gives you the C state information accumulated over time...
just look at the code how it does that ;)


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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