[petsc-dev] PetscOptionsGetViewer() problems with multiple usage on the same object but different options databases

[Matthew Knepley]

On Sat, Jan 21, 2023 at 4:34 PM Barry Smith <bsmith at petsc.dev> wrote:

>
>   If I run KSPSetFromOptions() on an options database that contains
> -ksp_view and then push another options database that does not contain
> -ksp_view and call KSPSetFromOptions() again it undoes the previous setting
> of that viewer.  So -ksp_view is not used.
>
>   I think this is the wrong model, it should not turn off the previously
> set view just because it is not being set in the new call, since it was
> previously set in the KSP. I fear some PETSc function will need another
> argument to properly handle this; like another flag to
> PetscOptionsGetViewer().
>
>   Note this is for much more than KSP.
>
>  Thoughts?
>

I think it must get rid of it. Otherwise, it would stay forever since there
would be no way to get rid of it.

  Matt


-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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