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If you find that your batch job is not resource efficient (CPU/wall time ratio is low AND memory usage is lower (less than 1GB, see use "bjobs -l job_id" ) AND doesn't require lots of network IOto find out)), try putting two tasks in one batch job (in the above script) and let them run in parallel. But be careful. Don't put run too many tasks in a batch job in parallel because it is very possible that your job is low efficient because there is an unknown factor limiting itpossible to overwhelming something in the whole computing environment.