MPI 3 Fortran 2008 interface
We recommend Fortran MPI programs use the MPI-2 interface via:
use mpi
or even better, the Fortran 2008 MPI-3 interface via:
use mpi_f08
instead of the deprecated and not recommended:
include 'mpif.h'
Intel MPI
IntelMPI supports MPI Fortran 2008 use mpi_f08
including on Windows using
free Intel oneAPI compiler.
Interfacing MPI 3 with legacy Fortran code
MPI 3 constants like mpi_comm_world
and mpi_real
are no longer integer
data type, but rather derived types.
Some libraries have not yet updated to be polymorphic for this enhanced MPI 3 variable type.
For such libraries, access the integer value via the %mpi_val
property.
use mpi_f08
integer :: comm = mpi_comm_world%mpi_val
!! %mpi_var emits the legacy integer