Poor performance with BoomerAMG?

[knutert at stud.ntnu.no]

Hello,

I am trying to use the hypre multigrid solver to solve a Poisson equation.
However, on a test case with grid size 257x257 it takes 40 seconds to converge
on one processor when I run with
./run -ksp_type richardson -pc_type hypre -pc_type_hypre boomeramg

Using the DMMG framework, the same problem takes less than a second,
and the default gmres solver uses only four seconds.

Am I somehow using the solver the wrong way, or is this performance expected?

Regards
Knut Erik Teigen