[petsc-users] PETSC_NULL_OBJECT gets corrupt after call to MatNestGetISs in fortran

[Klaij, Christiaan]

Barry, Satish

Any news on this issue?

Chris

> On Feb 12, 2015, at 07:13:08 CST, Smith, Barry <bsmith at mcs.anl.gov> wrote:
>
>    Thanks for reporting this. Currently the Fortran stub for this function is generated automatically which means it does not have the logic for handling a PETSC_NULL_OBJECT argument.
>
>     Satish, could you please see if you can add a custom fortran stub for this function in maint?
>
>   Thanks
>
>    Barry
>
> > On Feb 12, 2015, at 3:02 AM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:
> >
> > Using petsc-3.5.3, I noticed that PETSC_NULL_OBJECT gets corrupt after calling MatNestGetISs in fortran. Here's a small example:
> >
> > $ cat fieldsplittry2.F90
> > program fieldsplittry2
> >
> >  use petscksp
> >  implicit none
> > #include <finclude/petsckspdef.h>
> >
> >  PetscErrorCode :: ierr
> >  PetscInt       :: size,i,j,start,end,n=4,numsplit=1
> >  PetscScalar    :: zero=0.0,one=1.0
> >  Vec            :: diag3,x,b
> >  Mat            :: A,subA(4),myS
> >  PC             :: pc,subpc(2)
> >  KSP            :: ksp,subksp(2)
> >  IS             :: isg(2)
> >
> >  call PetscInitialize(PETSC_NULL_CHARACTER,ierr); CHKERRQ(ierr)
> >  call MPI_Comm_size(PETSC_COMM_WORLD,size,ierr); CHKERRQ(ierr);
> >
> >  ! vectors
> >  call VecCreateMPI(MPI_COMM_WORLD,3*n,PETSC_DECIDE,diag3,ierr); CHKERRQ(ierr)
> >  call VecSet(diag3,one,ierr); CHKERRQ(ierr)
> >
> >  call VecCreateMPI(MPI_COMM_WORLD,4*n,PETSC_DECIDE,x,ierr); CHKERRQ(ierr)
> >  call VecSet(x,zero,ierr); CHKERRQ(ierr)
> >
> >  call VecDuplicate(x,b,ierr); CHKERRQ(ierr)
> >  call VecSet(b,one,ierr); CHKERRQ(ierr)
> >
> >  ! matrix a00
> >  call MatCreateAIJ(MPI_COMM_WORLD,3*n,3*n,PETSC_DECIDE,PETSC_DECIDE,1,PETSC_NULL_INTEGER,0,PETSC_NULL_INTEGER,subA(1),ierr);CHKERRQ(ierr)
> >  call MatDiagonalSet(subA(1),diag3,INSERT_VALUES,ierr);CHKERRQ(ierr)
> >  call MatAssemblyBegin(subA(1),MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> >  call MatAssemblyEnd(subA(1),MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> >
> >  ! matrix a01
> >  call MatCreateAIJ(MPI_COMM_WORLD,3*n,n,PETSC_DECIDE,PETSC_DECIDE,1,PETSC_NULL_INTEGER,1,PETSC_NULL_INTEGER,subA(2),ierr);CHKERRQ(ierr)
> >  call MatGetOwnershipRange(subA(2),start,end,ierr);CHKERRQ(ierr);
> >  do i=start,end-1
> >     j=mod(i,size*n)
> >     call MatSetValue(subA(2),i,j,one,INSERT_VALUES,ierr);CHKERRQ(ierr)
> >  end do
> >  call MatAssemblyBegin(subA(2),MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> >  call MatAssemblyEnd(subA(2),MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> >
> >  ! matrix a10
> >  call  MatTranspose(subA(2),MAT_INITIAL_MATRIX,subA(3),ierr);CHKERRQ(ierr)
> >
> >  ! matrix a11 (empty)
> >  call MatCreateAIJ(MPI_COMM_WORLD,n,n,PETSC_DECIDE,PETSC_DECIDE,0,PETSC_NULL_INTEGER,0,PETSC_NULL_INTEGER,subA(4),ierr);CHKERRQ(ierr)
> >  call MatAssemblyBegin(subA(4),MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> >  call MatAssemblyEnd(subA(4),MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> >
> >  ! nested mat [a00,a01;a10,a11]
> >  call MatCreateNest(MPI_COMM_WORLD,2,PETSC_NULL_OBJECT,2,PETSC_NULL_OBJECT,subA,A,ierr);CHKERRQ(ierr)
> >  call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> >  call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr);CHKERRQ(ierr)
> > print *, PETSC_NULL_OBJECT
> >  call MatNestGetISs(A,isg,PETSC_NULL_OBJECT,ierr);CHKERRQ(ierr);
> > print *, PETSC_NULL_OBJECT
> >
> >  call PetscFinalize(ierr)
> >
> > end program fieldsplittry2
> > $ ./fieldsplittry2
> >                     0
> >              39367824
> > $
> >
> >
> > dr. ir. Christiaan Klaij
> > CFD Researcher
> > Research & Development
> > E mailto:C.Klaij at marin.nl
> > T +31 317 49 33 44
> >
> >
> > MARIN
> > 2, Haagsteeg, P.O. Box 28, 6700 AA Wageningen, The Netherlands
> > T +31 317 49 39 11, F +31 317 49 32 45, I www.marin.nl
> >


dr. ir. Christiaan Klaij
CFD Researcher
Research & Development
E mailto:C.Klaij at marin.nl
T +31 317 49 33 44


MARIN
2, Haagsteeg, P.O. Box 28, 6700 AA Wageningen, The Netherlands
T +31 317 49 39 11, F +31 317 49 32 45, I www.marin.nl