[GE users] Sort by sequence number question

Ravi Chandra Nallan Ravichandra.Nallan at Sun.COM
Wed Jul 11 13:08:52 BST 2007


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Does this happen for pe jobs or for any jobs?
I have tried it with batch/array jobs and it works as expected.

regards,
-Ravi

Paul MacInnis wrote:
> On Wed, 11 Jul 2007, [iso-8859-1] Lönroth Erik wrote:
>
>   
>> yes, it is set. Still no luck on this.
>>
>> The only way I can force the damn slaves off the MASTER node, is to remove the requested "PE" explicitly from the nodes. This is not what I would want, but I just can't make it happen. It simply ignores my sequence number alltogether. I have recreated all queues and restarted the qmaster and scheduler, but no luck whatsoever.
>>
>> Is there something else affecting the effect of "sequence number" outside of the general queue configuration and the cluster config?
>>     
>
> I would like to add our experience to this discussion.
>
> We recently switched from SGE5.3 to 6.1.  We have 1G, 2G and 4G nodes in
> our cluster.  If a job doesn't specify special memory requirements
> we want it scheduled to the smallest memory machine available.
>
> For 4 years with SGE5.3 this worked well.  We assigned sequence number
> 1965 to the 1G nodes, 2965 to the 2G nodes and 4965 to the 4G nodes.
>
> With SGE6.1 we defined our queues with
> seq_no  1965,[@2g.hg=2965],[@4g.hg=4965]
>
> @2g.hg being the 2G host group nodes and @4g.hg being the 4G nodes.
>
> With qconf -msconf we defined:
> queue_sort_method     seqno
>
> qstat -F presents the queues correctly ordered by this seqno.  However
> jobs are being scheduled to 2G and 4G nodes when there are 1G nodes
> available!
>
> This never happened in SGE5.3!
>
> It seems that in 6.1 either
> 1. "queue_sort_method  seqno" isn't working for queue selection or
> 2. there is some other queue selection criteria that overrides
>    "queue_sort_method  seqno"
>
> Any thoughts?
>
> Paul
>
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