On Thu, Feb 9, 2017 at 7:06 AM, Pierre Jolivet <[email protected]> wrote:

On Feb 9, 2017, at 1:37 PM, Matthew Knepley <[email protected]> wrote:

On Thu, Feb 9, 2017 at 4:56 AM, Pierre Jolivet <[email protected]

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wrote:

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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?

Its likely you have to use http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPSetNormTy... or *-ksp_norm_type unpreconditioned* since we would not have a chance to change it since its been set already. Thanks, Matt Thanks.

Thanks,

Matt

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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

-- 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