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Administering Platform LSF - SAS

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Automatic Detection of Hardware Reconfiguration<br />

How dynamic hardware changes affect <strong>LSF</strong><br />

<strong>LSF</strong> uses ncpus, maxmem, maxswp, maxtmp to make scheduling and load<br />

decisions.<br />

When processors are added or removed, <strong>LSF</strong> licensing is affected because <strong>LSF</strong><br />

licenses are based on the number of processors.<br />

If you put a processor offline:<br />

◆ Per host or per-queue load thresholds may be exceeded sooner. This is<br />

because <strong>LSF</strong> uses the number of CPUS and relative CPU speeds to calculate<br />

effective run queue length.<br />

◆ The value of CPU run queue lengths (r15s, r1m, and r15m) increases.<br />

◆ Jobs may also be suspended or not dispatched because of load thresholds.<br />

◆ Per-processor job slot limit (PJOB_LIMIT in lsb.queues) may be<br />

exceeded sooner.<br />

If you put a new processor online:<br />

◆ Load thresholds may be reached later.<br />

◆ The value of CPU run queue lengths (r15s, r1m, and r15m) is decreased.<br />

◆ Jobs suspended due to load thresholds may be resumed.<br />

Per-processor job slot limit (PJOB_LIMIT in lsb.queues) may be reached<br />

later.<br />

150<br />

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

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