[petsc-dev] Right-preconditioned GMRES

[Pierre Jolivet]

> On Feb 9, 2017, at 1:37 PM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> On Thu, Feb 9, 2017 at 4:56 AM, Pierre Jolivet <pierre.jolivet at enseeiht.fr <mailto:pierre.jolivet at enseeiht.fr>> wrote:
> Hello,
> I _might_ be doing something wrong when calling KSPSetFromOptions/KSPSetUp, but still, am I supposed to get this kind of error?
> [0]PETSC ERROR: No support for this operation for this object type
> [0]PETSC ERROR: KSP gmres does not support PRECONDITIONED with RIGHT
> 
> If not, I’ll try to send a MWE (it basically depends on where I set the option -ksp_pc_side right).
> 
> I believe its telling you that it cannot display the preconditioned residual with right preconditioning, which is true.
> Are you requesting both?

No, I’m just using -ksp_view and -ksp_pc_side right. In the “standard” case, it obviously work.
However, the error is triggered if I set -ksp_pc_side right after a first call to KSPSetOperators()/KSPSetUp() without destroying the KSP.
Should I destroy my KSP before changing from left- (default) to right-preconditioning if KSPSetOperators()/KSPSetUp has already been called?

Thanks.

>   Thanks,
> 
>      Matt
>  
> Thanks,
> Pierre
> 
> 
> 
> -- 
> 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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