The batch configuration is designed to maximize short job turnaround while allowing the heavy CPU jobs to get good usage of the resources available.
The basic configuration uses a range of classes - short, medium, long and verylong - with a range of maximum job CPU times of from five minutes to six days. An additional class, night, provides off-peak and weekend computing time on the interactive areas of the SP2 during periods of low demand. Access to this class is limited to specific users.
Users in different experiments are defined in LoadLeveler groups which provide associated queue priorities. This allows groups with a large computing budget to be given higher priorities. An automated procedure calculates each group's resource utilization over the last month and adjusts their priorities accordingly. This ensures a fair allocation of CPU time among the groups.