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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-03-06 09:51:41


On Mar 5, 2007, at 9:50 AM, Michael wrote:

> I have discovered a problem with the Fortran90 interfaces for all
> types of communication when one uses derived datatypes (I'm currently
> using openmpi-1.3a1r13918 [for testing] and openmpi-1.1.2 [for
> compatibility with an HPC system]), for example
>
> call MPI_RECV(tsk,1,MPI_TASKSTATE,src,
> 1,MPI_COMM_WORLD,MPI_STATUS_IGNORE,ier)
>
> where tsk is a Fortran 90 structure and MPI_TASKSTATE has been
> created by MPI_TYPE_CREATE_STRUCT.
>
> At the moment I can't imagine a way to modify the OpenMPI interface
> generation to work around this besides switching to --with-mpi-f90-
> size=small.

This is unfortunately a known problem -- not just with Open MPI, but
with the F90 bindings specification in MPI. :-( Since there's no
F90 equivalent of C's (void*), there's no way to pass a variable of
arbitrary type through the MPI F90 bindings. Hence, all we can do is
define bindings for all the known types (i.e., various dimension
sizes of the MPI types).

-- 
Jeff Squyres
Server Virtualization Business Unit
Cisco Systems