Verify That CRE Executes Jobs

Verify that the CRE can launch jobs on the cluster. For example, use the mprun command to execute hostname on all the nodes in the cluster, as shown below:

# mprun -Ns -np 0 hostnamenode1
node2

mprun is the CRE command that launches message-passing jobs. The combination of -Ns and -np 0 ensures that the CRE will start one hostname process on each node. See the mprun man page for descriptions of -Ns, -np, and the other mprun options. In this example, the cluster contains two nodes, node1 and node2, each of which returns its host name.

Note that the CRE does not sort or rank the output of mprun by default, so host name ordering may vary from one run to another.