From: Mark Somerville <mark@...>
Date: 2011-03-07T19:15:37+09:00
Subject: [ruby-core:35448] Re: Power consumption of timer thread


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Hi Chris!

On Tue, Nov 16, 2010 at 01:29:31AM +0900, Chris Mason wrote:
> Excerpts from SASADA Koichi's message of 2010-11-14 16:34:20 -0500:
> >=20
>=20
> Thank you for spending time on this issue.
>=20
> If you're running an unplugged laptop, powertop will show actual power
> consumption from the battery.  But, your power meter results are also
> going to be accurate.
=20
<snip>

> The power consumption is only really increased if the machine is
> otherwise idle.  If the machine is able to power down a CPU, waking that
> CPU up for the timer thread is fairly expensive.  If the CPU is already
> awake doing other tasks, the timer thread has a fairly small cost.

In case you missed it, you may be interested in checking out a different
thread/patch[1] on ruby-core. It would be great to hear some more
feedback about this.

[1] - http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/33456

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