Queueing Statistics from a User's Perspective

Job statistics from a supercomputing center can be monitored for many different purposes. It is obviously important for system tuning and problem detection. From the user's - and maybe funding agents' - point of view, the turnaround time obtained may be very important and can be described with various parameters. Unless moitored, turnaround times may approach equilibrium with workstations accessible locally to the users (IJSCA-HPC 9:4, 312-4, 1995). The poster will show different ways of displaying queueing data from the Supercomputing Centers supported by the Swedish Council for High-Performance Computing (HPDR). The relevance of different choices of parameters to be monitored will be discussed and related to analytical queueing theory. Possible implications of queueing theory for national computing policies will also be discussed.