[petsc-users] Insufficient memory when using GMRES + Boomeramg

[TAY wee-beng]

On 26/3/2014 11:22 PM, Matthew Knepley wrote:
> On Wed, Mar 26, 2014 at 9:59 AM, TAY wee-beng <zonexo at gmail.com 
> <mailto:zonexo at gmail.com>> 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

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