[petsc-users] KspTrueResidualNorm

[Ataollah Mesgarnejad]

Barry,

I did as you said and now I receive these errors once I try to run the
program:

[3]PETSC ERROR: MatHYPRE_IJMatrixCreate() line 76 in src/dm/da/utils/mhyp.c
[3]PETSC ERROR: PCSetUp_HYPRE() line 112 in src/ksp/pc/impls/hypre/hypre.c
[3]PETSC ERROR: PCSetUp() line 795 in src/ksp/pc/interface/precon.c
[3]PETSC ERROR: KSPSetUp() line 237 in src/ksp/ksp/interface/itfunc.c
[3]PETSC ERROR: KSPSolve() line 353 in src/ksp/ksp/interface/itfunc.c
[3]PETSC ERROR: UStep() line 511 in PFMAT-FD.cpp
[4]PETSC ERROR: MatHYPRE_IJMatrixCreate() line 76 in src/dm/da/utils/mhyp.c
[4]PETSC ERROR: PCSetUp_HYPRE() line 112 in src/ksp/pc/impls/hypre/hypre.c
[4]PETSC ERROR: PCSetUp() line 795 in src/ksp/pc/interface/precon.c
[4]PETSC ERROR: KSPSetUp() line 237 in src/ksp/ksp/interface/itfunc.c
[3]PETSC ERROR: main() line 95 in PFMAT-main.cpp
[4]PETSC ERROR: KSPSolve() line 353 in src/ksp/ksp/interface/itfunc.c
[4]PETSC ERROR: UStep() line 511 in PFMAT-FD.cpp
[4]PETSC ERROR: main() line 95 in PFMAT-main.cpp

Does right preconditiong work with *HYPRE*?
Best,
Ata

On Tue, Feb 1, 2011 at 2:21 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   The simplest thing is to simply run with -ksp_monitor_true_residual and
> see how the convergence is going in the true residual norm also.
>
>   You can also switch to right preconditioning with gmres and then the
> residual used by gmres is the true residual norm.  Use
> -ksp_preconditioner_side right -ksp_norm_type unpreconditioned
>
>   Barry
>
>
>
> On Feb 1, 2011, at 2:14 PM, Ataollah Mesgarnejad wrote:
>
> > Dear all,
> >
> > I'm using Ksp gmres with boomeramg preconditioning and I suspect that
> even though it converges in preconditioned norm it doesn't converge in true
> norm, but as I understand KSPSetNormType gmres does not support true
> residual norm? Is that correct and If it is, is there any other way to
> monitor the true norm? Do I need to Introduce my own convergence test?
> >
> > Best,
> > A. Mesgarnejad
>
>


-- 
A. Mesgarnejad
PhD Student, Research Assistant
Mechanical Engineering Department
Louisiana State University
2203 Patrick F. Taylor Hall
Baton Rouge, La 70803
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