[petsc-users] subdomain solver options

[Anton Popov]

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?

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
>