KSPMonitorTrueResidualNorm and SNES

[Lukasz Kaczmarczyk]

Hi Matt

I add monitor from options only.

Pleas note that for default KSP monitor a norm of preconditioned  
residual is printed only once. Problem exists when I monitor true  
residuals.

Regards,
Lukasz



On 27 Oct 2009, at 23:23, Matthew Knepley <knepley at gmail.com> wrote:

> It is possible to add the monitor twice. Are you sure this did not  
> happen?
>
>   Thanks,
>
>     Matt
>
> On Tue, Oct 27, 2009 at 6:19 PM, Lukasz Kaczmarczyk <likask at civil.gla.ac.uk 
> > wrote:
> Hello,
>
> I have noticed minor problem, potentially bug. For nonlinear  
> analysis with SNES and option -ksp_monitor_true_residual I get
>  0 Norm Res_strain 9.36e-12 Norm Res_stress 1.43e-05 Internal its   1
>  0 SNES Function norm 1.428489691212e-05
>    0 KSP preconditioned resid norm 7.213823259362e-04 true resid  
> norm 1.428489691212e-05 ||Ae||/||Ax|| 1.000000000000e+00
>    0 KSP preconditioned resid norm 7.213823259362e-04 true resid  
> norm 1.428489691212e-05 ||Ae||/||Ax|| 1.000000000000e+00
>    1 KSP preconditioned resid norm 4.903423697449e-04 true resid  
> norm 9.339595309685e-06 ||Ae||/||Ax|| 6.538090801174e-01
>    1 KSP preconditioned resid norm 4.903423697449e-04 true resid  
> norm 9.339595309685e-06 ||Ae||/||Ax|| 6.538090801174e-01
>
> It look that function KSPMonitorTrueResidualNorm is evaluated twice,  
> whereas for default KSP monitor only once. I use petsc-3.0.0-p7.
>
> Kind regards,
> Lukasz
>
>
>
> -- 
> 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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