Writing MPI programs

This section discusses six basic MPI routines. Both the C and Fortran interfaces are used in the examples. The main difference between the two interfaces is the way return codes are delivered to the caller. In C, the return codes are passed back as the result of the function. In Fortran, the return code is passed back through the last argument to the subroutine (ierr).

There are many good introductions to MPI for those who want information beyond what is given in this brief tutorial. Gropp, Lusk, and Skjellum have written Using MPI: Portable Parallel Programming with the Message Passing Interface. Foster devotes a chapter to MPI in his book, Designing and Building Parallel Programs; this resource is also available online at http://www.mcs.anl.gov/dbpp. The MPI homepage, http://www.mcs.anl.gov/mpi, contains useful introductory material as well as many reference documents on MPI.

• Basic MPI concepts: The MPI programming model.
• MPI initialization and termination functions Starting/ending a program
• MPI send functions: MPI_{Send}
• MPI receive functions: MPI_{Recv}
• Differences between HPVM and other MPI implementations MPI differences.
• A complete MPI example: Hello, world! and Makefile

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