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

[Jed Brown]

On Tue, Oct 25, 2011 at 20:50, Barry Smith <bsmith at mcs.anl.gov> wrote:

> The coloring the INL guy need is for efficient computation of Jacobians; it
> is a different coloring than needed for smoothers. Of course we should have
> both in PETSc, but have neither in parallel.


Isn't this just the distinction between coloring a symmetric matrix and
coloring a triangular matrix? (Maybe there are more consequences to the
algorithm.)
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