Thanks, Brian. That did the trick. -Ken
> -----Original Message----- > From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On > Behalf Of Brian Barrett > Sent: Thursday, July 19, 2007 3:39 PM > To: Open MPI Users > Subject: Re: [OMPI users] MPI_File_set_view rejecting subarray views. > > On Jul 19, 2007, at 3:24 PM, Moreland, Kenneth wrote: > > > I've run into a problem with the File I/O with openmpi version 1.2.3. > > It is not possible to call MPI_File_set_view with a datatype created > > from a subarray. Instead of letting me set a view of this type, it > > gives an invalid datatype error. I have attached a simple program > > that > > demonstrates the problem. In particular, the following sequence of > > function calls should be supported, but they are not. > > > > MPI_Type_create_subarray(3, sizes, subsizes, starts, > > MPI_ORDER_FORTRAN, MPI_BYTE, &view); > > MPI_File_set_view(fd, 20, MPI_BYTE, view, "native", MPI_INFO_NULL); > > > > After poking around in the source code a bit, I discovered that the > > I/O > > implementation actually supports the subarray data type, but there > > is a > > check that is issuing an error before the underlying I/O layer (ROMIO) > > has a chance to handle the request. > > You need to commit the datatype after calling > MPI_Type_create_subarray. If you add: > > MPI_Type_commit(&view); > > after the Type_create, but before File_set_view, the code will run to > completion. > > Well, the code will then complain about a Barrier after MPI_Finalize > due to an error in how we shut down when there are files that have > been opened but not closed (you should also add a call to > MPI_File_close after the set_view, but I'm assuming it's not there > because this is a test code). This is something we need to fix, but > also signifies a user error. > > > Brian > > -- > Brian W. Barrett > Networking Team, CCS-1 > Los Alamos National Laboratory > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
