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Queuing system on clusters
Never run anything on the head node!!! When you log into a cluster, you need to submit jobs to a queue or work interactively on a dedicated interactive node. The dedicated interactive nodes will have different names, so you just have to find them. Sometimes you can request nodes by qsub -I or qlogin, but these also depend on your system.
So, on any given cluster, there might be different queues (i.e. short, long, ultra-long) that you want to submit your jobs to. To find out (if you don't know already) you can qstat and the queue names will be the last column. It might be obvious about what each of these queues mean from the name and the amount of times thing have run in each queu (short < 12 hours, ultra-long > 2500 hours), but this is likely just something you need to find out from someone who knows about the cluster or from the sys admin again. Then if you want to submit to a specific queue, use something like this (I think, but I actually haven't done it exactly like this):
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