Thanks for the test case. Fixed here:

http://petsc.cs.iit.edu/petsc/petsc-dev/rev/7ac7040f19d7

On Sun, Apr 22, 2012 at 08:11, Alexander Grayver <agrayver@gfz-potsdam.de> wrote:

Matt,

Here are matrices (double complex, 3 MB each):
http://dl.dropbox.com/u/60982984/X.dat
http://dl.dropbox.com/u/60982984/Y.dat

Code:

static char help[] = "";
int main(int argc,char **args)
{
  Mat            A,B;
  PetscErrorCode ierr;
  PetscViewer    viewer;
  PetscScalar    cone;

  PetscInitialize(&argc,&args,(char *)0,help);

  ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,"Y.dat",FILE_MODE_READ,&viewer);CHKERRQ(ierr);
  ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr);
  ierr = MatSetFromOptions(A);CHKERRQ(ierr);
  ierr = MatLoad(A,viewer);CHKERRQ(ierr);
  ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr);

  ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,"X.dat",FILE_MODE_READ,&viewer);CHKERRQ(ierr);
  ierr = MatCreate(PETSC_COMM_WORLD,&B);CHKERRQ(ierr);
  ierr = MatSetFromOptions(B);CHKERRQ(ierr);
  ierr = MatLoad(B,viewer);CHKERRQ(ierr);
  ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr);
 
  cone = 1.0;
  ierr = MatAYPX(A,cone,B,DIFFERENT_NONZERO_PATTERN);
  ierr = PetscFinalize();
  return 0;
}

It works fine if you run it with:
mpirun -n 10 solveTest -mat_type aij

and crashes if n > 10

Thanks.

On 22.04.2012 14:51, Matthew Knepley wrote:

On Sun, Apr 22, 2012 at 8:41 AM, Alexander Grayver <agrayver@gfz-potsdam.de> wrote:

Sorry, I don't quite get. Is this something I can avoid by doing preallocation properly or petsc issue that will be fixed? 

This looks like a PETSc bug to me, but it would be nice to get input that triggers it.

  Thanks,

     Matt

 

On 20.04.2012 14:23, Jed Brown wrote:

On Fri, Apr 20, 2012 at 05:18, Matthew Knepley <knepley@gmail.com> wrote:

Did someone intend to fix this, and then stop? MatAXPY_BasicWithPreallocation() is the same as MatAXPY_Basic().

Look how it's called. I don't know what's going on here.

    ierr = MatAXPYGetPreallocation_SeqAIJ(yy->A,xx->A,nnz_d);CHKERRQ(ierr);

    ierr = MatAXPYGetPreallocation_SeqAIJ(yy->B,xx->B,nnz_o);CHKERRQ(ierr);

    ierr = MatMPIAIJSetPreallocation(B,0,nnz_d,0,nnz_o);CHKERRQ(ierr);

    ierr = MatAXPY_BasicWithPreallocation(B,Y,a,X,str);CHKERRQ(ierr);

-- 
Regards,
Alexander

--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

-- 
Regards,
Alexander

-- 
Regards,
Alexander