CRE-Generated Traffic

The CRE uses the cluster's default network interconnect to perform communication between the daemons that perform resource management functions. The CRE makes heavy use of this network when Sun MPI jobs are started, with the load being roughly proportional to the number of processes in the parallel jobs. This load is in addition to the start-up load described in the previous section. The CRE will generate a similar load during job termination as the CRE database is updated to reflect the expired MPI job.

There is also a small amount of steady traffic generated on this network as the CRE continually updates its view of the resources on each cluster node and monitors the status of its components to guard against failures.