[GE users] Resource Reservation Issue

Reuti reuti at staff.uni-marburg.de
Fri Sep 12 23:02:00 BST 2008


Am 11.09.2008 um 13:21 schrieb Bradford, Matthew:

> We are running SGE 6.0u8 and have a problem with how resource  
> reservation works.
> For example:
> We have a full cluster running mainly parallel jobs of various  
> sizes from 1 node to 16 nodes.
> We allow only 2 jobs to be run with a Reserve flag on them.
> Users aren't specifying an h_rt, and the default runtime is set to  
> 480 hours.
> Occasionally, we set important jobs with a reserve flag to prevent  
> resource starvation, and we push the job to the top of the pending  
> queue.
> What we appear to get when we switch on monitoring is the scheduler  
> selecting the nodes for the reserved job, but then not amending  
> that selection even when there are free nodes in the system.
> During testing of this we noticed no difference when we explicitly  
> set the h_rt to 480 hours for all jobs, and then reduce the h_rt  
> for specific jobs. We thought that the scheduler would recalculate  
> and select nodes where it knows that jobs are nearly finished.
what do you mean by "reducing" - the waiting jobs? With qalter while  
they are waiting?

-- Reuti

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