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command | purpose |
|---|---|
qsub jobscript | Submit job in script jobscript. Can accept other arguments as discussed above. |
qsub -I -l nodes=1:ppn=4 | Request interactive job with indicated resources. |
qdel jobID | Delete job number jobID. Seems to kill processes on compute nodes cleanly. |
showq | list jobs by state, with scheduling details. |
showbf | list "backfill," or number of processors available at the moment. |
qstat | List active jobs. Use "-i" for a different format. |
qstat -q | List queue attributes for all queues. |
qstat -f jobID | List detailed information for job number jobID. |
qnodes | List all nodes and their state and properties. |
qnodes -l down | List those nodes currently down. |
qnodes -l active or qnodes -l active | List nodes currently used for jobs. |
qnodes -l free | List nodes currently free. |
qmgr -c "print server" | Print queue configuration details |
administrative commands | |
pbsnodes -o NODENAME | Take node offline after allowing current job to finish. |
pbsndoes -r NODENAME | Check node and then return to free status if possible. |
showstats | Show usage statistics. |
The PBS queue system allocates a set of nodes and processors to an individual job, either for the walltime specified in the job or the maximum walltime in the queue. It then provides a set of environmental variables to the shell in which the script runs, such as PBS_NODEFILE, the temporary node file describing allocated CPUs. When running with OpenMPI's mpiexec, the submitted script seems to just launch processes without needing that nodefile specified as an argument to mpiexec, although it's not clear whether that behavior is a feature or a bug.
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