It can be compiled on the IBM SP with mpxlf -o mpi mpi.f It can then be executed by using the poe command ro by running the program directly. Options for controlling the execution are passed as flags or as environment variables. The most important thing to do is create a file with hostnames. The default is host.list . The use of the fast switch on the SP can happen in two modes, called IP mode and user mode.
User mode is best for optimal performance.
The result is the same.