[petsc-users] ksp_monitor_true_residual_norm

[Randall Mackie]

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)
  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.
>
>
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