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

[Jed Brown]

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.
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