Constant stride datatypes

Constant stride datatypes

• MPI_Type_vector
  • Good for fixed length operation (send 1 instance of a vector)
  • Some implementations optimize (MPICH, Cray T3D)
• MPI_Type_struct with MPI_UB entry
  • Good for variable length operation, but with fixed stride
  • No implementation known to optimize (yet)
• User pack/unpack (without MPI_Pack)

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Does this go here or later (later, I think)

definition of stride vs extent

Also, if IBM does, compare to VECTOR