Is DMMGSolve in Petsc a Newton-multigrid?

[Barry Smith]

    -snes_view will always show the solver options being used. -help  
will cause all the options that are currently available.

    Barry

On Jul 22, 2009, at 5:24 PM, (Rebecca) Xuefei YUAN wrote:

> Dear Matt,
>
> Does that mean mg is only used as a pc so far? Where could I check  
> on which smoother it uses and options Petsc provided for dmmg? There  
> is not much information on the user manual.
>
> Thanks,
>
> Rebecca
>
>
> Quoting Matthew Knepley <knepley at gmail.com>:
>
>> On Wed, Jul 22, 2009 at 3:18 PM, (Rebecca) Xuefei YUAN
>> <xy2102 at columbia.edu>wrote:
>>
>>> Is Newton iteration for the outer iterations and multigrid for the  
>>> linear
>>> inner iterations?
>>
>>
>> This is the usual formulation:
>>
>>  Newton to solve F(u) = 0
>>
>> and
>>
>>  Multigrid to precondition F'(u) \delta u = -F(u)
>>
>>  Matt
>>
>>
>>>
>>> Thanks
>>>
>>> --
>>> (Rebecca) Xuefei YUAN
>>> Department of Applied Physics and Applied Mathematics
>>> Columbia University
>>> Tel:917-399-8032
>>> www.columbia.edu/~xy2102 <http://www.columbia.edu/%7Exy2102>
>>>
>> --
>> 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
>>
>
>
>
> -- 
> (Rebecca) Xuefei YUAN
> Department of Applied Physics and Applied Mathematics
> Columbia University
> Tel:917-399-8032
> www.columbia.edu/~xy2102
>