Matthew Knepley knepley at
Tue May 13 08:21:14 CDT 2008

On Tue, May 13, 2008 at 8:10 AM,  <gaatenek at> wrote:
> Hello,
>  I am trying to use MatILUDTFactor make an incomplete factorisation for
>  preconditioner.
>  I did not if it work correctly. In general case, when you reduce you drop
>  tolerance criteria your preconditioner become better, but I all example
>  that I use he dot not change. I don't know if I use it well? Do I have to
>  install SPARSEKIT2 to make it work well?

1) ILU does not necessarily improve with increasing fill. There are no
    results for this PC.

2) I would first run with -ksp_view to see exactly what you have


>  Guy Atenekeng
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

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