[petsc-dev] Should -pc_type mg be a linear preconditioner by default?

[Matthew Knepley]

On Tue, Oct 25, 2011 at 10:06 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Tue, Oct 25, 2011 at 16:39, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>>  Chebychev?
>>
>
> Once I learned how to configure it, I quite like Chebychev for symmetric
> problems (and it is a natural fit for newer hardware).
>
> I don't know a good default for non-symmetric. Playing with ex50
> (increasing lid velocity and such), Chebychev with
> -mg_levels_ksp_chebychev_estimate_eigenvalues 0,.1,0,1.1 seems like not a
> bad default.
>

I am for that in dev and we can see if there are spectacular failures.

  Matt

-- 
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
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