[GE users] reserving free ram?

reuti reuti at staff.uni-marburg.de
Mon Nov 2 14:51:08 GMT 2009


Am 02.11.2009 um 13:42 schrieb cowlesav:

> Hey guys,
>
> I am very new to SGE and management of a cluster environment, as I am
> usually as NAS admin. But I have a question that I haven't been  
> able to
> get a definitive answer to on how to set and I thought I would  
> throw it
> out to the community and see if someone had a way to set it up. I have
> currently a small 32 node blade cluster each with 16GB of ram per  
> box. I
> have users that submit jobs that start out only requiring 3GB of  
> ram but
> at points swell to 8GB of ram. Lets say they submit multiple copies of
> the same job. The qmaster will see a box totally free, submit the job,
> and at first consume 3GB of ram, the 2nd job goes in, and seeing the
> same box, with 13GB free, it submits it there, and then the 3rd job
> follows along, because there is still plenty of free ram for the
> starting jobs, all the way up to 5 jobs per node, with 1GB ram  
> free. But
> when the first job starts to expand to that 8GB level, and it can't  
> get
> there, it hangs, and all the other jobs are doomed as well.
>
> I understand there is a way to set it, so that when you submit the  
> job,
> it automagically reserves 8GB of ram even though the job is only using
> 3, so that the qmaster will only assign 2 jobs to each node max.
>
> Any help you guys can provide would be most appreciated.

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-- Reuti

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