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Administering Platform LSF - SAS

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Job Slot Limits For Parallel Jobs<br />

Chapter 34<br />

Running Parallel Jobs<br />

A job slot is the basic unit of processor allocation in <strong>LSF</strong>. A sequential job uses<br />

one job slot. A parallel job that has N components (tasks) uses N job slots, which<br />

can span multiple hosts.<br />

By default, running and suspended jobs count against the job slot limits for<br />

queues, users, hosts, and processors that they are associated with.<br />

With processor reservation, job slots reserved by pending jobs also count<br />

against all job slot limits.<br />

When backfilling occurs, the job slots used by backfill jobs count against the<br />

job slot limits for the queues and users, but not hosts or processors. This means<br />

when a pending job and a running job occupy the same physical job slot on a<br />

host, both jobs count towards the queue limit, but only the pending job counts<br />

towards host limit.<br />

<strong>Administering</strong> <strong>Platform</strong> <strong>LSF</strong> 437

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