Hi,I am running a CFD solver. The Poisson eqn was originally solved using HYPRE's geometric multigrid.
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
