Thanks Matt, it works!

Anton

On 26.08.25 22:34, Matthew Knepley wrote:
On Tue, Aug 26, 2025 at 12:45 PM Anton Popov <po...@uni-mainz.de> wrote:

    There is an important addition, I use asm and bjacobi as smoothers on
    multigrid levels.

    So I probably need to set the options with -mg_levels_sub_, or
    -mg_levels_3_sub_(if they are different on different levels),
    instead of
    just -sub_.

    Correct?


Yes, and as Mark says, you can see the prefix if you View the solver.

  Thanks,

     Matt

    Anton



    On 26.08.25 18:20, Anton Popov wrote:
    > Hi all,
    >
    > I have a strange behavior setting the solver options for asm and
    > bjacobi blocks.
    >
    > Irrespective of what I set with -sub_ksp_ -sub_pc_ it just
    selects the
    > default preonly and ilu options.
    >
    > This behavior does not change no matter how many local blocks
    per cpu
    > I try to use, for example with the default one block/cpu it does
    not
    > work as well.
    >
    > Is there anything wrong?
    >
    > Best,
    >
    > Anton
    >



--
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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