[petsc-users] Convergence_Eigenvalues_k=3

[Dave May]

On the command line


On 25 April 2014 00:11, Oo <wumeng07maths at qq.com> wrote:

>
> Where should I put "
> -ksp_monitor_true_residual -ksp_monitor_singular_value " ?
>
> Thanks,
>
> Meng
>
>
> ------------------ Original ------------------
> *From: * "Barry Smith";<bsmith at mcs.anl.gov>;
> *Date: * Apr 25, 2014
> *To: * "Matthew Knepley"<knepley at gmail.com>;
> *Cc: * "Oo "<wumeng07maths at qq.com>; "petsc-users"<petsc-users at mcs.anl.gov>;
>
> *Subject: * Re: [petsc-users] Convergence_Eigenvalues_k=3
>
>
>    There are also a great deal of “bogus” numbers that have no meaning and
> many zeros. Most of these are not the eigenvalues of anything.
>
>    Run the two cases with -ksp_monitor_true_residual
> -ksp_monitor_singular_value and send the output
>
>   Barry
>
>
> On Apr 24, 2014, at 4:53 PM, Matthew Knepley <knepley at gmail.com> wrote:
>
> > On Thu, Apr 24, 2014 at 12:57 PM, Oo <wumeng07maths at qq.com> wrote:
> >
> > Hi,
> >
> > For analysis the convergence of linear solver,
> > I meet a problem.
> >
> > One is the list of Eigenvalues whose linear system which has a
> convergence solution.
> > The other is the list of Eigenvalues whose linear system whose solution
> does not converge (convergenceReason=-3).
> >
> > These are just lists of numbers. It does not tell us anything about the
> computation. What is the problem you are having?
> >
> >   Matt
> >
> > Do you know what kind of method can be used to obtain a convergence
> solution for our non-convergence case?
> >
> > Thanks,
> >
> > Meng
> >
> >
> >
> > --
> > 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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