Topology and Queues
PBS Pro uses queues to manage system resources. For example, some queues have higher priority than others, some are only available to specific users (e.g. scgc), and some are specific to specific CPUs (e.g. scgc & c2).
Routing queues automatically put your job into the appropriate queue based on the resources that you requested. There is one routing queue for general use and one for scgc-only.
When a job is submitted, if sufficient resources are idle, then the job will be run immediately. If not, then the job will be considered by the scheduler when a running job completes. When deciding which jobs to run, the scheduler will try to run high-priority jobs first. If a large, high-priority job requires resources that are currently unavailable, the scheduler will attempt to fill in smaller jobs provided they do not delay that large, high-priority job.