[petsc-users] How to use multigrid?

[Jed Brown]

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?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20121109/e32d8bf3/attachment.html>