[petsc-users] Convergence_Eigenvalues_k=3

[Barry Smith]

On Apr 24, 2014, at 5:24 PM, Oo <wumeng07maths at qq.com> wrote:

> 
> Configure PETSC again?

   No, the command line when you run the program. 

Barry

> 
> ------------------ Original ------------------
> From:  "Dave May";<dave.mayhem23 at gmail.com>;
> Send time: Friday, Apr 25, 2014 6:20 AM
> To: "Oo "<wumeng07maths at qq.com>;
> Cc: "Barry Smith"<bsmith at mcs.anl.gov>; "Matthew Knepley"<knepley at gmail.com>; "petsc-users"<petsc-users at mcs.anl.gov>;
> Subject:  Re: [petsc-users] Convergence_Eigenvalues_k=3
> 
> 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
> 
> .
>