On Feb 9, 2017, at 1:37 PM, Matthew Knepley <knepley@gmail.com> wrote:

On Thu, Feb 9, 2017 at 4:56 AM, Pierre Jolivet <pierre.jolivet@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