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Why won't my job start? It is just waiting in the queue.
MSI performs scheduled maintenance on the first Wednesday of each month. You may be requesting a walltime of such a length that your job cannot finish before the next maintenance window; this will affect you if the system on which your job is queued is scheduled for maintenance, as jobs will not start if they cannot complete.
If your fairshare is over target on a particular machine, your jobs may not start before the jobs of other users.
If you are asking for more resources (such as memory per node) than are currently available, your job must wait for the requested resources to be available before it can start. Some job configurations will never run; see the information about the specific resource in question (HPC or Labs) for guidance.