Generally, the longest amount of time an individual job may run on SciClone and Chesapeake is either 72 or 180 hours, depending on the subcluster. This allows for calculations that may take several days to complete to run without needing to be subdivided into shorter jobs, but also means that even if you are next in the queue, you may have to wait several days before nodes become available.
To facilitate shorter turnaround for debugging and test jobs (or any other short jobs), we maintain standing reservations that further restrict maximum walltime on a few nodes:
|Subcluster||Number of nodes (cores) reserved
||Longest walltime allowed
|Whirlwind||2 (16)||1 hour||8am-6pm M-F|
|Hurricane||2 (16)||1 hour||8am-6pm M-F|
|Whirlwind||4 (32)||3 hours||8am-6pm M-F|
|Vortex||2 (24)||1 hour||8am-6pm M-F|
|Vortex||6 (72)||8 hours||
7:30pm-3:30am every day
Jobs whose resource specification meets the restriction will automatically be able to use the reserved nodes. Please contact the HPC group if you have any problems using these reservations, or if you need a reservation on another subcluster.