[torqueusers] reducing energy usage of torque

Daniel Fernando Coimbra danielfcoimbra at gmail.com
Tue Feb 28 00:43:28 MST 2012

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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