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On 8/10/2010 2:05 AM, rishi pathak wrote:
<blockquote
cite="mid:AANLkTikhfRgYRAYXc_oAD5zznxPGF-RMt_=UQxdrm=qM@mail.gmail.com"
type="cite">Power aware scheduling should not restricted to node
power on and off(costly affair), it should also facilitate for
fine grained power control at node leve(CPU throttling, power to
memory banks). Although we have not evaluated MOAB for green
computing, but by looking at documentation, it seems like moab
does not still provide for it. Also it would be better if previous
usage patterns are considered and not just the idle time for a
node.<br>
</blockquote>
Some studies have shown that the biggest/easiest win in the power
game is from shutting machines off, not slowing them down, as around
50% of the power in many servers is non-CPU related. Shutting down
power to memory banks could be a possible savings, but I'm not aware
of motherboards that make that an easy option. Turning off disks
can help a little in some cases, for some loads, but given a 15W
disk versus a 95W processor...<br>
<br>
It may seem costly to turn machines on and off, but if your cluster
usage fluctuates broadly at different times of the day it *is* the
*low hanging fruit*.<br>
<br>
Jeff Anderson-Lee<br>
<blockquote
cite="mid:AANLkTikhfRgYRAYXc_oAD5zznxPGF-RMt_=UQxdrm=qM@mail.gmail.com"
type="cite">
<div class="gmail_quote">On Mon, Aug 9, 2010 at 9:39 PM, David
Beer <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:dbeer@adaptivecomputing.com">dbeer@adaptivecomputing.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid
rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left:
1ex;">
I know that Moab has a way to do this, but that involves
buying Moab.<br>
<div>
<div class="h5"><br>
----- Original Message -----<br>
> For the power saving purpose we want to call one
script / program for<br>
> each job submission.<br>
> This script should run only on head node and perform
job to turn on<br>
> extra nodes if free nodes are not sufficient to run a
job.<br>
><br>
> Another script/program will turn-off idle nodes .<br>
> How to do that ...Will appreciate if you share any
idea for<br>
> implementation.<br>
</div>
</div>
</blockquote>
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</blockquote>
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