On Wed, 24 Aug 2011, Jed Brown wrote: > On Wed, Aug 24, 2011 at 09:33, Wienand Drenth <w.drenth at gmail.com> wrote: > > > The program compiles without troubles, but running it gives me an error. It > > is, I think, related to the MPI_SUM operation: > > [walrus:463] *** An error occurred in MPI_Scan: the reduction operation > > MPI_SUM is not defined on the MPI_BYTE datatype > > [walrus:463] *** on communicator MPI_COMM_WORLD > > [walrus:463] *** MPI_ERR_OP: invalid reduce operation > > [walrus:463] *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort) > > > > In addition, I needed to declare MPIU_INT explicitly as integer; this was > > not required for the C program. > > > > I believe MPIU_INT (which is normally made to match PetscInt) is not defined > in Fortran. You can use MPI_INTEGER4 or MPI_INTEGER8 as needed. > > Perhaps PETSc should define MPIU_INT, MPIU_SCALAR, etc in Fortran too?
MPI does MPI_INT (c) vs MPI_INTEGER (fortran) - so we have MPIU_INTEGER on the fortran side. [in finclude/petscsys.h] And we do have MPIU_SCALAR on the fortran side. Satish >
