MPICH is in the directory /grad/s4/mpich, and is accessible from any CS 
graduate system machine.

Before you try MPI, please do the following:
(1) Add /grad/s4/mpich/bin to your PATH environment
(2) Add /grad/s4/mpich/man to your MANPATH environment
(3) Try "tstmachines -v" in your home directory, which will tell you
    what machines are in our virtual parallel machine.

Now you are ready to use MPI:
(4) Copy /grad/s4/mpich/examples/basic (yes, the whole directory) to
    your home directory (you may want to make a examples directory
    to hold the stuff in /grad/s4/mpich/examples/basic)
(5) Do "make" in your own examples directory. 
(6) Try "mpirun -np 4 cpi", which will compute the value of PI in parallel
    ( on 4 processors)

Every MPI routine can be looked up using "man".