[petsc-users] Problem on LU factorization

[Satish Balay]

On Mon, 24 Jan 2011, Matthew Knepley wrote:

> > When I use superlu with command line "-sub_pc_factor_mat_solver_package
> > superlu", it said
> 
> "[43]PETSC ERROR:
> > ------------------------------------------------------------------------
> > [43]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation,
> > probably memory access out of range
> > [43]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
> > [43]PETSC ERROR: or see
> > http://www.mcs.anl.gov/petsc/petsc-as/documentation/troubleshooting.html#Signal[43]PETSCERROR: or try
> > http://valgrind.org on GNU/linux and Apple Mac OS X to find memory
> > corruption errors
> > [43]PETSC ERROR: likely location of problem given in stack below
> > [43]PETSC ERROR: ---------------------  Stack Frames
> > ------------------------------------
> > [43]PETSC ERROR: Note: The EXACT line numbers in the stack are not
> > available,
> > [43]PETSC ERROR:       INSTEAD the line number of the start of the function
> > [43]PETSC ERROR:       is given.
> > [43]PETSC ERROR: [43] MatLUFactorNumeric_SuperLU line 121
> > src/mat/impls/aij/seq/superlu/superlu.c
> > [43]PETSC ERROR: [43] MatLUFactorNumeric line 2575
> > src/mat/interface/matrix.c
> > ............................
> >  "
> >
> 
> Please confirm that you have the latest patch level. If so, send the matrix
> in PETSc binary format to petsc-maint at mcs.anl.gov
> along with the precise solver options and output of -ksp_view.

More likely there is memory corruption somewhere - should run this
code with valgrind to weed out such issues..

Satish