NullMPI is a trivial (and currently incomplete) implementation of the MPI Standard for use as a uniprocessor replacement. Use this to port your parallel code to machines without a MPI implementation or quick test-compiles.
NullMPI allows global communications and limited point-to-point communications to self. Timing is supported. Compilation options allow for debug and statistics output.
Furthermore, the set of headers can be used with the static source code checker splint (see http://splint.org/) for portability testing.
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