Send / Receive (S/R) MPI test programs:   Compile with mpif77.mpich
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isenda.f     Integer Unbuffered MPI S/R works with MPICH in Leipzig for 
             arrays up to size 31999 elements and fails with 32000 or 
	     more elements. 

isendb.f     Integer Buffered MPI S/R fails with MPICH in Leipzig.

dsenda.f     Double Precision Real*8 Unbuffered MPI S/R works with 
             MPICH in Leipzig for arrays up to size 15999 elements 
	     and fails with 16000 or more elements. 

dsendb.f     Double Precision Real*8 Buffered MPI S/R fails with 
             MPICH in Leipzig.