Send / Receive (S/R) MPI test programs:   Compile with mpif77
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isenda.f     Integer Unbuffered MPI S/R works on the tested Open MPI 
             implementations for arrays up to 1006 elements and fails 
             with 1007 or more elements. 

isendb.f     Integer Buffered MPI S/R works well on the tested Open 
             MPI implementations.

dsenda.f     Double Precision Real*8 Unbuffered MPI S/R works on the 
             tested Open MPI implementations for arrays up to 503 
             elements and fails with 504 or more elements. 

dsendb.f     Double Precision Real*8 Buffered MPI S/R works well on 
             the tested Open MPI implementations.