On large clusters, it is possible for jobs to fail because there are too few licenses for all the jobs to run. A mechanism has been provided to ensure that a queued job will not run unless all the licenses it requires are available. This facility is supported for the PBS Pro queueing system from version 10.1 on. The configuration process consists of the following steps:
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1.
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Define a resource representing each license in the queueing system configuration. |
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2.
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Configure the load sensor script, which reports how many tokens are available for each license, so that it can find the license file and the FLEXlm utility that it uses to query the license server. It can also be configured to reserve licenses for non-queue use. |
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3.
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Install this script in the appropriate queueing system directory. |
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4.
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Configure Job Control to specify license requirements when launching jobs. |
Each of these steps is described in detail in the topics listed below.