[Mauiusers] Backfill chunking

Steve Young chemadm at hamilton.edu
Wed Apr 2 08:59:23 MDT 2008


Hi Hemanth,
	I'm not for certain on your question but I do wonder was the job  
actually a backfill'd job? I'm expecting that it actually ran it  
normally instead of using backfill at all. if you do a checkjob  
<jobid> it should say something in there about if the job is a  
backfill'ed one or not.

-Steve

On Apr 1, 2008, at 6:39 AM, Hemanth Yamijala wrote:

> Hi,
>
> I am trying to understand backfill chunking in Maui + Torque  
> environment. From what I understand, the configuration will allow  
> Maui to accumulate resources freed by jobs, for a configured time,  
> before allocating them for other backfill jobs.
>
> In my Maui.cfg, I set up the following:
>
> BFCHUNKDURATION 00:05:00
> BFCHUNKSIZE 5
>
> The default walltime for torque queues is set to a large value  
> (several thousand hours). The rest of the Maui configuration is  
> default configuration.
>
> Now, on a 14 node cluster, I did the following:
>
> echo "sleep 3600" | qsub -l nodes=7
> echo "sleep 3600" | qsub -l nodes=14 (This got queued, and got a  
> reservation)
>
> echo "sleep 3600" | qsub -l nodes=3 -l walltime=0:30:00
> echo "sleep 3600" | qsub -l nodes=4 -l walltime=0:30:00 (Both these  
> jobs ran)
>
> echo "sleep 3600" | qsub -l nodes=7 -l walltime=0:30:00 (This got  
> queued)
> echo "sleep 3600" | qsub -l nodes=3 -l walltime=0:30:00 (This also  
> got queued)
>
> Now, when I deleted the running 3 node job using qdel, the last 3  
> node job immediately ran.
>
> Shouldn't Maui have waited for BFCHUNKDURATION time before running  
> this ? Can you please help me understand whether backfill chunking  
> should have worked here ?
>
> Thanks
> hemanth
>
>
>
>
>
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