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Administering Platform LSF - SAS

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How Deadline Constraint Scheduling Works For<br />

Parallel Jobs<br />

Chapter 34<br />

Running Parallel Jobs<br />

For information about deadline constraint scheduling, see “Deadline Constraint<br />

Scheduling” on page 174. Deadline constraint scheduling is enabled by default.<br />

If deadline constraint scheduling is enabled and a parallel job has a CPU limit<br />

but no run limit, <strong>LSF</strong> considers the number of processors when calculating how<br />

long the job will take.<br />

<strong>LSF</strong> assumes that the minimum number of processors will be used, and that<br />

they will all be the same speed as the candidate host. If the job cannot finish<br />

under these conditions, <strong>LSF</strong> will not place the job.<br />

The formula is:<br />

(deadline time - current time) > (CPU limit on candidate host / minimum<br />

number of processors)<br />

<strong>Administering</strong> <strong>Platform</strong> <strong>LSF</strong> 459

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