Synopsis

MPI_Aint MPI_Aint_diff(MPI_Aint addr1, MPI_Aint addr2)

Input Parameters

addr1

minuend address (integer)

addr2

subtrahend address (integer)

Notes

MPI_Aint_diff produces a new MPI_Aint value that is equivalent to the difference between addr1 and addr2 arguments, where addr1 and addr2 represent addresses returned by calls to MPI_GET_ADDRESS. The resulting address is valid only at the process that generated addr1 and addr2, and addr1 and addr2 must correspond to locations in the same object in the same process. The difference is calculated in a manner that results the signed difference from addr1 to addr2, as if the process that originally produced the addresses had called

(char *) addr1 - (char *) addr2

on the addresses initially passed to MPI_GET_ADDRESS.

Notes for Fortran

All MPI routines in Fortran (except for 'MPI_WTIME' and 'MPI_WTICK') have an additional argument 'ierr' at the end of the argument list. 'ierr' is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the 'call' statement.

All MPI objects (e.g., 'MPI_Datatype', 'MPI_Comm') are of type 'INTEGER' in Fortran.

See also

MPI_Aint_add(3)