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ring is a common example of an MPI program; it runs with any number of
processes, and sends a simple message sequentially through all the
processes, with the last process returning the message back to process
zero.  This message repeats the "ring" N times.

This example is taken directly from the MPI 2 C++ package
distribution; it is a simple C++ implementation of the standard "ring"
example program.  It uses the C++ MPI bindings to effect message
passing. 

Use hcp to compile the program.

hcp -o ring ring.cc
