KSPMonitorTrueResidualNorm and SNES

[Barry Smith]

   What prehistoric version of PETSc are you using?


   Barry
On Oct 27, 2009, at 6:19 PM, Lukasz Kaczmarczyk 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