[GE users] Scheduling policy question

reuti reuti at staff.uni-marburg.de
Wed Sep 16 10:37:32 BST 2009

Am 15.09.2009 um 21:56 schrieb prentice:

> I have a 64-node cluster with 8 slots per node (dual quad-core
> processors). Lately a lot of jobs are being submitted from
> gridMathematica by several users. I have another user that wants to  
> take
> advantage of exclusive  node use for his OpenMP programs.  
> Unfortunately,
> The default scheduler action (queue_sort_method = load)is creating a
> problem for this scenario. Here's why.
> gridMathematica breaks up it's jobs into separate, independent sub- 
> jobs,
> and submits them to SGE as individual jobs, so that if a user requests
> 32 processors in Mathematica, 32 separate jobs are submitted to SGE at
> the same time.
> Right now, I have one Mathematica user submitting jobs that request  
> 2 or
> 3 processors, and then he submits another Mathematica job like that a
> little later. The end result is that pretty soon, every node is  
> running
> Mathematica, but using only 2 or 3 slots. This prevents my OpenMP user
> from running his job, because there are no nodes he can get exclusive
> use of, even though only 1/4 - 3/8 of the slots in the cluster are  
> being
> used.
> The easiest way to fix this problem would be to set
> queue_sort_method=seqno, but I'm afraid this isn't the best method,
> either, since there probably will be times where I want jobs  
> assigned to
> the least-loaded node. I've read the sched_conf man page, but don't  
> see
> any obvious (simple) fixes.
> If the Mathematica jobs were truly parallel, I could create a PE with
> allocation_rule=$fill_up, which might help.
> Any suggestions?

Please have a look here:


for a "fill up" configuration.

-- Reuti

> -- 
> Prentice
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