[Starcluster] Load Balancer Problems

[Justin Riley]

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Raj,

> 2. What is your preference for how long a job should stay idle before
> being killed?

I think you meant *node* not job...

> I usually don't check how long it has been idle. If it
> is idle now and the queue is empty then kill it. I could add code to
> check how long it has been idle, if it seems useful. Is there a use
> case?

Also, the node must be up for the "majority of the hour" before it can
be considered for removal. This provides flexibility for the queue to
stabilize and also saves money given that you pay for the entire
instance hour anyway.

As far as the "code to check how long a node has been idle" goes I'm not
sure I understand the use case/context either. Mind bringing the list up
to date on this discussion?

~Justin

On 08/02/2010 02:38 PM, Rajat Banerjee wrote:
> Hey Amaro,
> Cool thanks. I called Brian and got info regarding the array of jobs.
> I checked in some test code that works fine on my (simple) cluster
> with qsub -t 1-20:1. I'd appreciate it if you'd test and let me know
> how it goes. Just committed to github:
> http://github.com/rqbanerjee/StarCluster/commit/17998a68feab3d1440aa5d9edc2e74697e43ef54
> 
> Making requests during a business day has its rewards :)
> 
> Regarding the host that had been inactive for a short time:
> 1. If the "tasks" field was properly recognized , as it is now, the
> queue should be recognized as full, and that node probably wouldn't
> have been killed.
> 2. What is your preference for how long a job should stay idle before
> being killed? I usually don't check how long it has been idle. If it
> is idle now and the queue is empty then kill it. I could add code to
> check how long it has been idle, if it seems useful. Is there a use
> case?
> 
> Thanks,
> Rajat
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> Starcluster at mit.edu
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