By default, your job will run on the cluster where you are logged in.
If you are logged in on a machine that is connected to the Sun HPC cluster on which you want to run your job, but is not part of the cluster, use mprun -c cluster_name to specify the cluster.
Use the hostname of the cluster's master node as the cluster name. You can find the cluster's master node by running mpinfo -C on any node in the cluster. See "Specifying the Partition" for additional details.