Poor performance with BoomerAMG?
zonexo at gmail.com
Fri Feb 15 07:47:49 CST 2008
I'm currently using boomeramg to solve my poisson eqn too. I'm using it
on my structured C-grid. I found it to be faster than LU, especially as
the grid size increases. However I use it as a preconditioner with GMRES
as the solver. Have you tried this option? Although it's faster, the
speed increase is usually less than double. It seems to be worse if
there is a lot of stretching in the grid.
Btw, your mention using the DMMG framework and it takes less than a sec.
What solver or preconditioner did you use? It's 4 times faster than GMRES...
knutert at stud.ntnu.no wrote:
> I am trying to use the hypre multigrid solver to solve a Poisson
> However, on a test case with grid size 257x257 it takes 40 seconds to
> 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
> Knut Erik Teigen
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