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qsub -l nodes=1:ppn=8 pbsjob |
The reason for the special cases (latter two) is to guarantee memory resources for your job. If memory on a node is overallocated, swap will be used. Job(s) that are actively using swap (disk) to simulate memory could take more than 1000 times longer to finish than a job running on dedicated memory. In most cases, this will mean your job will never finish.
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