Simple Example of Derived Datatype

• integer derivedtype, ...

• call MPI_TYPE_CONTIGUOUS(10, MPI_REAL, derivedtype, ierr)

• call MPI_TYPE_COMMIT(derivedtype, ierr)

• call MPI_SEND(data, 1, derivedtype, dest, tag, MPI_COMM_WORLD, ierr)

• call MPI_TYPE_FREE(derivedtype, ierr)

• is equivalent to simpler single call

• call MPI_SEND(data, 10, MPI_REAL, dest, tag, MPI_COMM_WORLD, ierr)

• and each sends 10 contiguous real values at location data to process dest

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