I'm re-working Open MPI's Fortran implementation with Craig. The MPI_SIZEOF function is supposed to return the size of any Fortran intrinsic data type. MPI-2.2 16.2.5 p494:31-44 says: ----- The following functions allow a user to obtain a size-specific MPI datatype for any intrinsic Fortran type. MPI_SIZEOF(x, size) IN x a Fortran variable of numeric intrinsic type (choice) OUT size size of machine representation of that type (integer) MPI_SIZEOF(X, SIZE, IERROR) <type> X INTEGER SIZE, IERROR This function returns the size in bytes of the machine representation of the given variable. It is a generic Fortran routine and has a Fortran binding only. ----- Is there any way of implementing that other than an interface with an overloaded subroutine for every single intrinsic type (including dimension)? -- Jeff Squyres [email protected] For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/