On 26/3/2014 11:22 PM, Matthew Knepley wrote:
On Wed, Mar 26, 2014 at 9:59 AM, TAY wee-beng <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I am running a CFD solver. The Poisson eqn was originally solved
using HYPRE's geometric multigrid.
Is this on a structured grid?
Yes.
Matt
Recently, I tested it with Boomeramg as the preconditioner and
GMRES as the ksp solver. There's a 20% increase in speed.
However, when I increased the grid resolution, I got the out of
memory error. Changing the solver back to HYPRE solved the problem.
So does GMRES + Boomeramg used more memory than other solvers?
Are there alternatives?
Thank you.
--
Yours sincerely,
TAY wee-beng
--
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
-- Norbert Wiener
