Two hours spent in the economy queue will offset the surcharge levied for using one hour in premium. Interactive sessions are used for debugging, interactive graphics, brief tests, and other short tasks, at a surcharge of 100 percent over regular queue use. The standby queue is designed to make unused machine cycles available. The other queues are used infrequently and have special restrictions. Interactive sessions are also appropriate for running brief tests, checking man pages, and performing short editing tasks.
Interactive sessions have the highest priority and therefore the highest charging factor.
It is generally not appropriate to perform a major part of your computing tasks interactively or to run large jobs interactively. The premium queue is for jobs that need fast turnaround. Jobs in prem have the highest priority of all queued jobs, so they also have a high charging factor. The regular queue is for production jobs that require normal turnaround. Jobs in reg have lower priority than prem jobs and higher priority than econ jobs.