Prism Traffic

The Prism debugger is used to tune, debug and visualize Sun MPI programs running within the cluster. As Prism itself is a parallel program, starting it will generate the same sort of CRE traffic that invocation of other application generates.

Once Prism has been started, two kinds of network traffic are generated during a debugging session. The first, which has been covered in preceding sections, is traffic created by running the Sun MPI code that is being debugged. The second kind of traffic is generated by Prism itself and is routed over the default network along with all other administrative traffic. In general, the amount of traffic generated by Prism itself is small, although viewing performance analysis data on large programs and visualizing large data arrays can cause transiently heavy use of the default network.