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

[Barry Smith]

On Oct 25, 2011, at 8:43 PM, Jed Brown wrote:

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> I downloaded that paper when we talked about it this summer. It looks like the parallel coloring is a meaningful chunk of it? The INL guys are also asking for a parallel coloring, so it's something we should do regardless.

   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.

   Barry