[GE users] Machine Priority

Charu Chaubal Charu.Chaubal at Sun.COM
Tue Oct 19 15:27:07 BST 2004


Hi Sean,

On Oct 19, 2004, at 7:22 AM, Sean Dilda wrote:

> On Tue, 2004-10-19 at 09:58, Reuti wrote:
>>> I have a cluster running SGE 6.0  This cluster consists of a mixture 
>>> of
>>> 1Ghz, 2Ghz, and 3Ghz machines.  Is there a way to ensure that the 
>>> 3Ghz
>>> machines are always used first out of the pool of open resources?
>>
>> You can set a different sequence number for each type of machine and
>> change the scheduler to sort by seqno (qconf -msconf). This will give
>> the intended result (for serial jobs).
>>
>> For simpleness I suggest defining three hostgroups. Then you can set:
>
> I have an almost identical problem to the original poster.  I had
> considered this, but from what I can tell, it means that load average
> will no longer be taken into account (except for alarm states) when
> scheduling jobs.  This seems like a bad thing to me.
>

That's not how it works.  If you choose seq_no as the sort method, then 
if there are multiple places where the seq_no is identical, then the 
load_formula is automatically used as the secondary sort method.  So, 
within that group of hosts, the least loaded host will be used.

Regards,
	Charu

> I've also considered the load scaling.  Unfortunately, not matter what
> scaling you do, a load of 0.00 will always scale to a load of 0.00, and
> this doesn't help the problem any.
>
> Does anyone have a better way to do this?  Perhaps somehow add a
> constant to the generated load of each host based on processor speed?
>
>
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# Charu V. Chaubal				# Phone: (650) 786-7672 (x87672)
# Grid Computing Technologist	# Fax:   (650) 786-4591
# Sun Microsystems, Inc.			# Email: charu.chaubal at sun.com
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