KSPMonitorTrueResidualNorm and SNES

[Barry Smith]

    You are calling SNESSetFromOptions() or KSPSetFromOptions() twice.  
If you call it once the problem won't appear.

    There is an extremely ugly hack that is implemented for the  
default monitor, but not other monitors, to prevent this double  
printing. Whoever wrote this ugly hack should have done it properly.

    Barry

On Oct 28, 2009, at 2:39 AM, Lukasz Kaczmarczyk wrote:

> 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