[petsc-users] ILU - factor fill ratio

[Matthew Knepley]

On Mon, Jul 28, 2014 at 7:43 AM, Oliver Browne <oliver.browne at upm.es> wrote:

> Hi,
>
> I am using the ILU preconditioner. I am looking at "factor fill ratio" in
> the output. Is there a way to a priori calculate what this value may be to
> determine whether enough memory is available? How does PETSc determine this
> value?
>

Calculating this is as difficult as doing the symbolic factorization, so we
guess and check.

  Thanks,

     Matt


> Thanks,
>
> Ollie
>



-- 
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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