[petsc-users] Convergence_Eigenvalues_k=3

[Oo]

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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