[petsc-users] about ksp

[Matthew Knepley]

On Mon, Aug 29, 2011 at 2:59 PM, Likun Tan <likunt at andrew.cmu.edu> wrote:

> Thanks,
>
> I read ex16.c, it seems that the two linear equations are solved
> sequentially?
>

Yes, this is a test for reuse of preconditioner information. As I said, no
one knows
how to do this for Krylov methods (and everyone has tried).

    Matt


> On Mon, August 29, 2011 10:52 am, Satish Balay wrote:
> > On Mon, 29 Aug 2011, Matthew Knepley wrote:
> >
> >
> >> On Mon, Aug 29, 2011 at 2:40 PM, Likun Tan <likunt at andrew.cmu.edu>
> >> wrote:
> >>
> >>
> >>> Dear all,
> >>>
> >>>
> >>> I have linear systems Ax=b with different right-hand-side vectors.
> >>> These
> >>> vectors are independent. Could i generate b simultaneously and solve
> >>> Ax=b
> >>> simultaneously?
> >>>
> >>
> >> Unfortunately, no one has figured out how to exploit this for Krylov
> >> methods.
> >>
> >
> > Also - check ksp/ksp/examples/tutorials/ex16.c
> >
> >
> > Satish
> >
> >
> >
>
>
>
>
>


-- 
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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