[GE users] allocation rules

Maxime Kinet mkinet at ulb.ac.be
Wed Apr 23 15:53:56 BST 2008

Is it possible to specify an upper/lower limit on the number of slots  
per job on a defined queue? I cannot figure out how to do it.



On 21 Apr 2008, at 12:29, Reuti wrote:

> Hi,
> Am 21.04.2008 um 11:05 schrieb Maxime Kinet:
>> we have a cluster of 20 machines, each one made of 8 cores, running  
>> SGE 6.0. The jobs are either parallel, running on more than one  
>> core, or serial jobs using only one core. I would like to have jobs  
>> running on less than eight processors to be dispatched on the same  
>> machine, in order to minimize the communication time. Right now,  
>> when jobs are submitted, the scheduler choose an empty node, if  
>> there is one, regardless the number of nodes required.
>> Here is an example to make things clearer. If I have two machines,  
>> that is sixteen nodes, and I start by submitting two one-processors  
>> jobs. The first one will be dispatched to machine1, and the second  
>> one to machine2. Then, if I launch a 8 processors job, it will be  
>> spread between the two nodes (7 procs on machine1 and one on  
>> machine2). While it could have choosed to run the two serial jobs  
>> on machine1, and the parallel job on machine2.
>> Therefore, I think the allocation rule I choosed for the parallel  
>> environment ('Fill up') is obviously not the good one. Is there  
>> another allocation rule that wou,ld more apropriate to the kind of  
>> tasks at the hand? Should I create several queues for the different  
>> kinds of jobs?
>> Thanks a lot for any answers/explanation.
> This might help: http://blogs.sun.com/sgrell/entry/grid_engine_scheduler_hacks_least 
>  (maybe with "allocation_rule $pe_slots").
> In addition (or as a more simple standalone setup), you could define  
> two queues (one "qtype none" for parallel jobs only), and change the  
> seq_no for both queues in the opposite way. I.e. serial jobs will  
> first use machine 1, then 2. While parallel ones will first use  
> machine 2, and then 1(the scheduler must be set to  
> "queue_sort_method seqno").
> -- Reuti
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