KSPMonitorTrueResidualNorm and SNES

[Matthew Knepley]

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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