For this kind of short time jobs, maybe they are try to use GNU parallel. Ask a 
few compute nodes from job scheduler, use parallel to run many jobs at the same 
time. parallel will launch new jobs when there are CPU cores free.

Best,
Shenglong

> On Aug 19, 2016, at 5:47 AM, Gokcehan Kara <[email protected]> wrote:
> 
> Hello,
> 
> We have a small cluster consisting of ~40 machines in our university for 
> running MD simulations. One of our users is working on a project where she 
> needs to submit many jobs of about 5 min lengths. To my understanding, she is 
> doing some calculations in a script to find some parameters and submit 4 or 5 
> of these jobs at the same time in the script. And then rinse and repeat. So 
> the problem is that she says after a while (~3000 jobs) jobs start to take 
> some time before scheduled. We thought it might be related to some slurm 
> settings about fairness or such but couldn't find anything about it. Is there 
> a way to disable this waiting time?
> 
> Thanks in advance,
> Gokcehan

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