Basic HTML version of Foils prepared August 29 98

Foil 9 Generalizing the Buffer in MPI

From Designing and Building Parallel Programs 3: MPI Message Passing System DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
1 MPI specifies the buffer by starting address, datatype, and count
  • Starting address is obvious
  • Datatypes are constructed recursively from
    • Elementary (all C and Fortran datatypes)
    • Contiguous array of datatypes
    • Strided blocks of datatypes
    • Indexed array of blocks of datatypes
    • General structures
  • Count is number of datatype elements
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