[mvapich-discuss] Hello World, MPI-3.0 and mpi_f08

[Jeff Hammond]

While OpenMPI doesn't yet provide all of MPI-3, they implemented the
Fortran 2008 interface already.  The people on the Fortran working
group defining that interface decided to prototype in OpenMPI, which
put it ahead in that race.

MPICH - from which MVAPICH is derived - does not yet support the
Fortran 2008 interface, but it is under active development right now.
If you want more precise information, you should write
discuss at mpich.org.

Best,

Jeff

On Tue, Dec 17, 2013 at 8:12 AM, Thompson, Matt (GSFC-610.1)[SCIENCE
SYSTEMS AND APPLICATIONS INC] <matthew.thompson at nasa.gov> wrote:
> MVAPICH2 List,
>
> In trying to get used to all the new features of MPI-3.0 and Fortran
> support, I recently whipped up a simple program following the Green Book.
> Obviously since all compilers might not support all the bits of Fortran 2008
> needed for full compliance, I chose a simple example, Hello World, to start
> out:
>
> ****
>
> program hello_world
>
>    use mpi_f08
>
>    implicit none
>
>    type(MPI_Comm) :: comm
>    integer :: myid, npes, ierror
>    integer :: name_length
>
>    character(len=MPI_MAX_PROCESSOR_NAME) :: processor_name
>
>    call mpi_init(ierror)
>
>    comm = MPI_COMM_WORLD
>
>    call MPI_Comm_rank(comm,myid,ierror)
>    call MPI_Comm_size(comm,npes,ierror)
>    call MPI_Get_processor_name(processor_name,name_length,ierror)
>
>    write (*,'(A,X,I4,X,A,X,I4,X,A,X,A)') "Process", myid, "of", npes, "is
> on", trim(processor_name)
>
>    call MPI_Finalize(ierror)
>
> end program hello_world
>
> ****
>
> As far as I can tell, this is MPI-3.0 standards compliant, and Open MPI
> 1.7.3 (which, as far as I know, doesn't support as much of MPI-3.0 as
> MVAPICH2 does) runs it just fine.
>
> However, when I try to compile it with MVAPICH2 2.0b, it bombs out because
> it can't find the mpi_f08 module. And, fair enough, I can't seem to see it
> anywhere in the MVAPICH2 installation directory (include/, I'm guessing
> since mpi.mod is there).
>
> So, I guess my question is does MVAPICH2 support mpi_f08? Or is that more a
> question of does MPICH support mpi_f08...and if they don't, MVAPICH2 can't?
>
> Thanks,
> Matt
>
> --
> Matt Thompson, PhD     SSAI, Sr Software Test Engr
> NASA GSFC, Global Modeling and Assimilation Office
> Code 610.1, 8800 Greenbelt Rd, Greenbelt, MD 20771
> Phone: 301-614-6712              Fax: 301-614-6246
>
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-- 
Jeff Hammond
jeff.science at gmail.com