[petsc-users] Multigrid coarse grid solver

[Mark Adams]

>
>
> 1) Can we motivate why you would ever want a parallel coarse grid? I
> cannot think of a reason.
>
>
AMG coarsening is not 100% reliable, in many respects, but on complex
domains with a lot of levels you can fail eventually and stopping
coarsening prematurely can be a stop gap measure.

True, in theory you never need to stop.
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