You can configure preemption for parallel jobs to reduce the number of jobs suspended in order to run a large parallel job.
When a high-priority parallel job preempts multiple low-priority parallel jobs, sometimes LSF preempts more low-priority jobs than are necessary to release sufficient job slots to start the high-priority job.
The PREEMPT_FOR parameter in lsb.params with the MINI_JOB keyword enables the optimized preemption of parallel jobs, so LSF preempts fewer of the low-priority parallel jobs.
Enabling the feature only improves the efficiency in cases where both preemptive and preempted jobs are parallel jobs.
When you run many parallel jobs in your cluster, and parallel jobs preempt other parallel jobs, you can enable a feature to optimize the preemption mechanism among parallel jobs.
By default, LSF can over-preempt parallel jobs. When a high-priority parallel job preempts multiple low-priority parallel jobs, sometimes LSF preempts more low-priority jobs than are necessary to release sufficient job slots to start the high-priority job. The optimized preemption mechanism reduces the number of jobs that are preempted.
Enabling the feature only improves the efficiency in cases where both preemptive and preempted jobs are parallel jobs. Enabling or disabling this feature has no effect on the scheduling of jobs that require only a single processor.