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HECC Home / Support Home / KB Home / Running Jobs with PBS / PBS Reference / Default Variables Set by PBS

Default Variables Set by PBS

Article ID: 189
Last updated: 29 Jun, 2015

You can use the env command--either in a PBS script or on the command line of a PBS interactive session--to find out what environment variables are set within a PBS job. In addition to the PBS_X environment variables, the following variables are useful to know:

NCPUS
Defaults to number of CPUs that you requested for the node.
OMP_NUM_THREADS
Defaults to 1 unless you explicitly set it to a different number. If your PBS job runs an OpenMP or MPI/OpenMP application, this variable sets the number of threads in the parallel region.
FORT_BUFFERED
Defaults to 1. Setting this variable to 1 enables records to be accumulated in the buffer and flushed to disk later.
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