[petsc-users] Hypre's BoomerAMG vs PETSc's GAMG?

[Jed Brown]

Justin Chang <jychang48 at gmail.com> writes:
> I see that there's GAMG and there's Hypre's BoomerAMG (and perhaps others
> too?) 

ML

> What exactly is the difference between these two? Do they have very
> different implementations under the hood? Does one have better
> scalability over another? Or more importantly, when would I choose one
> over the other?

BoomerAMG is classical AMG, which is a different coarsening strategy
From GAMG and ML which use smoothed aggregation.  The math is different
and the implementation is different.  ML and GAMG have similar math and
there exist configurations that are equivalent.
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