PETSC-Hypre: number of level with boomeramg

[Nicolas Bathfield]

Thanks,

the syntax is correct and it shows everything I need!

Best regards,

Nicolas

> 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
>>
>
>


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