Other datatype routines

Other Datatype Routines

• The size of a datatype is termed the extent.
• The extent is given by:

       mpi_type_extent (datatype, extent, ierr)

• mpi_type_hvector is same as mpi_type_vector, except stride is given in bytes.
• mpi_type_hindexed is same as mpi_type_indexed, except offsets in array of offsets are given in bytes.
• The offsets in a datatype may be given relative to a ``base address,'' given by the MPI constant mpi_bottom.
• The address of a location can be found thus:

       mpi_address (location, address, ierr)