[petsc-users] Multigrid coarse grid solver

[Jed Brown]

Mark Adams <mfadams at lbl.gov> writes:

> On Wed, Apr 26, 2017 at 7:30 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>>
>>   Yes, you asked for LU so it used LU!
>>
>>    Of course for smaller coarse grids and large numbers of processes this
>> is very inefficient.
>>
>>    The default behavior for GAMG is probably what you want. In that case
>> it is equivalent to
>> -mg_coarse_pc_type bjacobi --mg_coarse_sub_pc_type lu.  But GAMG tries
>> hard
>
>
> No, it just slams those puppies onto proc 0 :)

Mark is a puppy slammer.
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