PETSC-Hypre: number of level with boomeramg

[Shaman Mahmoudi]

Try -pc_hypre_boomeramg_print_statistics in the console for more  
information regarding your AMG.

I believe that is the right syntax. I am not 100% though! It is a  
long time ago I touched it.

With best regards, Shaman Mahmoudi

On Jan 25, 2007, at 3:31 PM, Nicolas Bathfield wrote:

> 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
>