Batch systems

• Running interactively is NOT an option

• Don't know how many processes are already running,cannot assign priorities

• Jobs compete with each other (loss of performance due to swapping). No load balancing possible ...

• Legitimate interactive work jeopardized (not fair) (compilation/code development, testing, editor ...)

• Restricted amount of resources you can access (RCF ~ 10%, PDSF ~ 4%)

• Alternative, using “a” batch system

• PDSF and RCF : LSF versatile, flexible, ... but commercial

• Others: PBS, Condor, NQS, ... all free, not as flexible, Condor a “plus” as really close

Notes: