On Tue, 2007-03-06 at 09:51 -0500, Jeff Squyres wrote: > 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). >
What about the "Fortran 2003 ISO_C_BINDING" couldn't a C_LOC be used here? (I probably don't know what i'm talking about but i just saw a reference to it.) -- Ake Sandgren, HPC2N, Umea University, S-90187 Umea, Sweden Internet: a...@hpc2n.umu.se Phone: +46 90 7866134 Fax: +46 90 7866126 Mobile: +46 70 7716134 WWW: http://www.hpc2n.umu.se
