Datatypes in MPI

Elementary:

Language-defined types (e.g., MPI_INT or MPI_DOUBLE_PRECISION )

Vector:

Separated by constant ``stride''

Contiguous:

Vector with stride of one

Hvector:

Vector, with stride in bytes

Indexed:

Array of indices (for scatter/gather)

Hindexed:

Indexed, with indices in bytes

Struct:

General mixed types (for C structs etc.)