Is there such a thing as a custom datatype in MPI, or do you have to flatten everything into a text string and pass as MPI_CHAR? If you are required to flatten everything, is there a built-in function I am overlooking?
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The answer is MPI_Type_contiguous (the link is to the documentation). It allows you to block out a specific amount of space based on basic data types, and their respective offsets.
Zak
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A much better answer is MPI_Type_create_struct. It allows you to replicate your struct datatype and pass it around, there is a great example of it's use at DeinoMPI.
Zak
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