[petsc-users] How to use multigrid?

Jed Brown jedbrown at mcs.anl.gov
Fri Nov 9 11:40:23 CST 2012

Don't speculate, send -log_summary and information about the problem and
machine. Some setup operations degrade, but solves should scale pretty well.

On Fri, Nov 9, 2012 at 11:37 AM, Thomas Witkowski <
thomas.witkowski at tu-dresden.de> wrote:

> While we're at it, can some of you tell me some world about parallel
> scaling of algebraic multigrid methods? In most of my codes I use them to
> precondition some simple blocks, e.g. Laplace matrix. I'm pretty sure that
> parallel scaling of my solver is limited mostly by scaling of the AMG
> method which is used. What are the expectations, when going to 10^3 or 10^4
> cores?
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