[petsc-users] Convergence_Eigenvalues_k=3

[Oo]

Configure PETSC again?


------------------ 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



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