[petsc-dev] Bad scaling of GAMG in FieldSplit

[Mark Adams]

>
>
> > Well, you could use _threshold to do more aggressive coarsening, but not
> > for thinning out
> > the interpolation.
>
> Increasing the threshold results in slower coarsening.
>
> Note that square_graph 10 is very unusual.
>
>
Actually this is not crazy. For linear tets it is the way to go and
recently I looked a ex56 (3D cube of Q1 elasticity) and this with a finite
threshold worked best. I could swear that this was not the case in the past
:/
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