[torqueusers] Green computing - Power on/off

Jeff Anderson-Lee jonah at eecs.berkeley.edu
Tue Aug 10 12:04:59 MDT 2010

  On 8/10/2010 2:05 AM, rishi pathak wrote:
> 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.
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...

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*.

Jeff Anderson-Lee
> On Mon, Aug 9, 2010 at 9:39 PM, David Beer 
> <dbeer at adaptivecomputing.com <mailto:dbeer at adaptivecomputing.com>> wrote:
>     I know that Moab has a way to do this, but that involves buying Moab.
>     ----- Original Message -----
>     > For the power saving purpose we want to call one script /
>     program for
>     > each job submission.
>     > This script should run only on head node and perform job to turn on
>     > extra nodes if free nodes are not sufficient to run a job.
>     >
>     > Another script/program will turn-off idle nodes .
>     > How to do that ...Will appreciate if you share any idea for
>     > implementation.

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