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It is important the the slots=1 property is NOT CHANGED to slots=2 if you
have a cluster of SMP nodes. The value slots=1 (default value if not specified)
is required for the mpirun/scrun command to handle multi-processor nodes.
Setting slots greater than 1 in the nodes file will cause mpi jobs to hang.
In addition to causing MPI jobs to hang, setting the slots property to be greater
than one will prevent multi-threaded (e.g OpenMP) jobs to fail (you obviously
cannot run a multi-threaded job across 2 cpus located on different nodes).