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Administering Platform LSF - SAS

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How Preemptive Scheduling Works<br />

Job slot limits specified at the queue level are never affected by preemptive<br />

scheduling; they are always enforced for both running and suspended jobs.<br />

Preemption of multiple job slots<br />

Preemption of parallel jobs<br />

If multiple resources are required, <strong>LSF</strong> can preempt multiple jobs, until<br />

sufficient resources are available. For example, one or more jobs might be<br />

preempted for a job that needs multiple job slots.<br />

When a high-priority parallel job preempts multiple low-priority parallel jobs,<br />

sometimes <strong>LSF</strong> preempts more low-priority jobs than are necessary to release<br />

sufficient job slots to start the high-priority job.<br />

Use the PREEMPT_FOR parameter in lsb.params to enable the optimized<br />

preemption of parallel jobs, so <strong>LSF</strong> preempts fewer of the low-priority parallel<br />

jobs.<br />

See “Optimized Preemption of Parallel Jobs” on page 460 for more<br />

information.<br />

180<br />

<strong>Administering</strong> <strong>Platform</strong> <strong>LSF</strong>

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