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

[Satish Balay]

Sorry for dropping the ball on this issue. I pushed the following fix to maint branch.

https://bitbucket.org/petsc/petsc/commits/3a4d7b9a6c83003720b45dc0635fc32ea52a4309

To use this change with petsc-3.5.3 - you can drop in the attached replacement files at:

src/mat/impls/nest/ftn-custom/zmatnestf.c
src/mat/impls/nest/ftn-auto/matnestf.c

Satish

On Fri, 24 Apr 2015, Klaij, Christiaan wrote:

> 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
> 
> 
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