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Why do we need a batch system?
Manage individual CPUs and do load balancing and job monitoring and control across the cluster (faster CPUs are loaded first).
Fair Share scheduling
- on PDSF STAR users have to share with other groups (~70%)
- this works to everybody’s advantage (prior to last QM STAR got between 90% and 100% of the cluster).
Shares and priorities
dynamic priority = (number of shares)/
((1+number of jobs running)*RUN_JOB_FACTOR +
(total run time of jobs in execution)*RUN_TIME_FACTOR))