[petsc-users] ksp_monitor_true_residual_norm

[Randall Mackie]

Hi Matt,

I'm afraid it didn't work by passing in dummy=0. 

Randy


On Apr 17, 2012, at 10:39 AM, Matthew Knepley wrote:

> On Tue, Apr 17, 2012 at 1:27 PM, Randall Mackie <rlmackie862 at gmail.com> wrote:
> Hi Barry,
> 
> I've tried implementing this in Fortran, following ex2f.F in /src/ksp/ksp/examples/tutorials, but
> it is bombing out with the following message:
> 
> ---------------------- Error Message ------------------------------------
> [0]PETSC ERROR: Invalid argument!
> [0]PETSC ERROR: Wrong type of object: Parameter # 1!
> [0]PETSC ERROR: ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 5, Sat Oct 29 13:45:54 CDT 2011 
> -------------------- Error Message ------------------------------------
> [0]PETSC ERROR: Invalid argument!
> [0]PETSC ERROR: Wrong type of object: Parameter # 1!
> [0]PETSC ERROR: ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 5, Sat Oct 29 13:45:54 CDT 2011 
> 
> 
> [1]PETSC ERROR: PetscViewerASCIIAddTab() line 277 in src/sys/viewer/impls/ascii/filev.c
> [1]PETSC ERROR: KSPMonitorTrueResidualNorm() line 233 in src/ksp/ksp/interface/iterativ.c
> [1]PETSC ERROR: ourmonitor() line 103 in src/ksp/ksp/interface/ftn-custom/zitfuncf.c
> [1]PETSC ERROR: KSPMonitor() line 1429 in src/ksp/ksp/interface/itfunc.c
> [1]PETSC ERROR: KSPSolve_CG() line 255 in src/ksp/ksp/impls/cg/cg.c
> [1]PETSC ERROR: KSPSolve() line 423 in src/ksp/ksp/interface/itfunc.c
> 
> 
> I am running PETSC 3.2-p5.
> 
> I have set my monitor routine as follows:
> 
>   subroutine ShellKSPMonitor(ksp, n, rnorm, dummy, ierr)
> 
>   implicit none
> 
> #include "finclude/petsc.h"
> 
>   KSP :: ksp
>   PetscErrorCode :: ierr
>   PetscInt :: n, dummy
>   PetscReal :: rnorm
> 
>   if (n == 200) then
>     call KSPMonitorTrueResidualNorm(ksp,n,rnorm,dummy,ierr)
> 
> I think it should work if dummy is 0, but we should really do NULL conversion
> here and you should pass PETSC_NULL.
> 
>    Matt
>  
>   end if
> 
>   return
>   end subroutine ShellKSPMonitor
> 
> And then in the main program I call:
> 
>   call KSPMonitorSet(ksp,ShellKSPMonitor,PETSC_NULL_OBJECT, PETSC_NULL_FUNCTION, ierr)
> 
> As I have followed the example in the PETSc documentation, I am unsure where I have made a mistake.
> 
> Thanks, 
> 
> Randy M
> 
> 
> On Fri, Apr 13, 2012 at 5:01 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
> 
>   Write a one line monitor that calls the true residual monitor when desired:
> 
>    PetscErrorCode  myKSPMonitorTrueResidualNorm(KSP ksp,PetscInt n,PetscReal rnorm,void *dummy)
>    {
>        if (n % 10) {
>           ierr = KSPMonitorTrueResidualNorm(ksp,n,rnorm,dummy);CHKERRQ(ierr);
>        }
>    }
> 
>    then call this on the KPS
> 
>   ierr = KSPMonitorSet(ksp,myKSPMonitorTrueResidualNorm,PETSC_VIEWER_STDOUT,0);CHKERRQ(ierr);
> 
> 
> On Apr 13, 2012, at 6:52 PM, Randall Mackie wrote:
> 
> > In using ksp_monitor_true_residual_norm, is it possible to change how often this information is printed out?
> > That is, instead of every iteration, say I only want to see it every 10 or 20 iterations. Is there an easy way
> > to do this, other than creating my own monitor and doing it myself?
> >
> > Thanks, Randy M.
> 
> 
> 
> 
> 
> -- 
> 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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