<html><body bgcolor="#FFFFFF"><div>Hi Matt</div><div><br></div><div>I add monitor from options only. </div><div><br></div><div>Pleas note that for default KSP monitor a norm of preconditioned residual is printed only once. Problem exists when I monitor true residuals. </div><div><br></div><div>Regards,</div><div>Lukasz </div><div><br><br></div><div><br>On 27 Oct 2009, at 23:23, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>It is possible to add the monitor twice. Are you sure this did not happen?<br><br> Thanks,<br><br> Matt<br><br><div class="gmail_quote">On Tue, Oct 27, 2009 at 6:19 PM, Lukasz Kaczmarczyk <span dir="ltr"><<a href="mailto:likask@civil.gla.ac.uk"><a href="mailto:likask@civil.gla.ac.uk">likask@civil.gla.ac.uk</a></a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hello,<br>
<br>
I have noticed minor problem, potentially bug. For nonlinear analysis with SNES and option -ksp_monitor_true_residual I get<br>
0 Norm Res_strain 9.36e-12 Norm Res_stress 1.43e-05 Internal its 1<br>
0 SNES Function norm 1.428489691212e-05<br>
0 KSP preconditioned resid norm 7.213823259362e-04 true resid norm 1.428489691212e-05 ||Ae||/||Ax|| 1.000000000000e+00<br>
0 KSP preconditioned resid norm 7.213823259362e-04 true resid norm 1.428489691212e-05 ||Ae||/||Ax|| 1.000000000000e+00<br>
1 KSP preconditioned resid norm 4.903423697449e-04 true resid norm 9.339595309685e-06 ||Ae||/||Ax|| 6.538090801174e-01<br>
1 KSP preconditioned resid norm 4.903423697449e-04 true resid norm 9.339595309685e-06 ||Ae||/||Ax|| 6.538090801174e-01<br>
<br>
It look that function KSPMonitorTrueResidualNorm is evaluated twice, whereas for default KSP monitor only once. I use petsc-3.0.0-p7.<br>
<br>
Kind regards,<br><font color="#888888">
Lukasz<br>
</font></blockquote></div><br><br clear="all"><br>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener<br>
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