[torqueusers] reducing energy usage of torque

Ryan Golhar ngsbioinformatics at gmail.com
Tue Feb 28 07:08:00 MST 2012


What about cycling the power using a PDU?

On Tue, Feb 28, 2012 at 2:43 AM, Daniel Fernando Coimbra <
danielfcoimbra at gmail.com> wrote:

> I assume that by "turning off" you mean actually power down the node. I
> am just curious on how do you intend to power it up again later.  I
> suppose you could use something like WakeUp on Lan, but I never actually
> got to test this kind of thing and don't know how it would behave on a
> high traffic network (I suppose the network card doesn't keep it's IP
> once it's in such state).
>
> On 02/26/2012 08:24 PM, Arka Aloke Bhattacharya wrote:
> > Hi everyone,
> >
> > I am a PhD student at UC Berkeley, and I wanted to add a "turning off
> > idle/underutilized servers" feature to our 100 server torque+maui
> > deployment. However, I want to implement this feature using only
> > existing torque+ maui interfaces and extensions ( i,e _without
> > modifying_ the torque or maui source code in any way ).
> >
> > My proposed way is to
> > 1. monitor the maui queue length , and estimate the number of servers
> > I can switch off.
> > 2. I would then use "pbsnodes -o <nodename>" command to render a
> > certain number of servers offline for scheduling.
> > 3. A bash script would turn the servers off.
> >
> > The servers would be turned back on (and added to the torque nodes
> > list) when the queue length increases beyond a certain threshold.
> >
> > I had two questions :
> >
> > 1. Is there any existing open source code which already implements the
> > "turning off idle servers" functionality in torque ?
> > 2. Are there complications that would arise if I implemented the
> > "turning-off idle servers" feature in my proposed way ? [ e.g - Is it
> > possible that after turning off servers, they would lose some state
> > and hence would not get added to the torque <nodes_list> when turned
> > back on? Are there long lived TCP connections which need to be
> > restarted separately ? , etc ]
> >
> > It would be great if anyone could help.
> >
> > Thanks a lot,
> > Arka.
> >
> >
> > _______________________________________________
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> > torqueusers at supercluster.org
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>
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