[petsc-users] About DIVERGED_ITS

[Mark F. Adams]

It sounds like your -ksp_rtol is too small.  Experiment with looser tolerances until your solution is not "correct" to see how much accuracy you want.

On Jul 7, 2012, at 12:15 PM, w_ang_temp wrote:

>     Maybe it is a problem of mathematical concept. I compare the result with the true result which is
>  
> computed and validated by other tools. I think it is right if I get the same result.
> 
> 在 2012-07-08 00:03:21，"Matthew Knepley" <knepley at gmail.com> 写道：
> On Sat, Jul 7, 2012 at 10:00 AM, w_ang_temp <w_ang_temp at 163.com> wrote:
> Hello,
>  
>     I am a little puzzled that I get the right result while the converged reason says that 'Linear solve did not
>  
> converge due to DIVERGED_ITS iterations 10000'. This infomation means that the iterations reach the maximum
>  
> iterations. But the result is right now. So why says 'did not converge'? Can I think that the result is right and
>  
> can be used?
> 
> Obviously, your definition of "right" is not the same as the convergence tolerances you are using.
> 
>     Matt
>  
>  
>     Thanks.
>    
>                                             Jim
> 
> 
> 
> 
> 
> -- 
> 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
> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120707/4c9f8747/attachment-0001.html>