PETSC-Hypre: number of level with boomeramg

[Nicolas Bathfield]

Dear Fernando,

Thanks for your reply.

I had notice the value maxlevels given by -ksp_view, but I did not know
how to change this value.

Still, as the default is 25 levels I think, I have no way to know exactly
how many levels are used for a given case.
I can reformulate my question in this way: does boomeramg coarsen the
"grid" to the coarsest level possible, i.e. 1 cell over the domain, or
does it stop before that? (grid is not the right term when it comes to
algebraic multilevel methods, but I can't find any other clear way to
express it). How can I control the coarsening?

Thinking about it, perhaps boomeramd actually refines the grid up to the
maximum number of levels...Is it so?

Thanks for your help.

Nicolas

> Nicolas,
>
> You should try the option -pc_hypre_boomeramg_max_levels in the line
> command. In order to see the level's details you can use the PESTc option
> -ksp_view.
>
> Best Regards
>
> Fernando.
>
>
> Em (11:15:45), petsc-users at mcs.anl.gov escreveu:
>
>
>>Hi Petsc users,
>>
>>I have a question regarding the use of Hypre and especially Boomeramg.
>>How can we control the number of levels in the multigrid algortihm? Can
>> we
>>chose it, or if not, can we display it in some way?
>>
>>Best regards,
>>
>>Nicolas.
>>
>>--
>>Nicolas BATHFIELD
>>Chalmers University of Technology
>>Shipping and Marine Technology
>>phone: +46 (0)31 772 1476
>>fax: +46 (0)31 772 3699
>>
>>----------
>
>
>


-- 
Nicolas BATHFIELD
Chalmers University of Technology
Shipping and Marine Technology
phone: +46 (0)31 772 1476
fax:   +46 (0)31 772 3699