<div class="gmail_extra">Don't speculate, send -log_summary and information about the problem and machine. Some setup operations degrade, but solves should scale pretty well.<br><br><div class="gmail_quote">On Fri, Nov 9, 2012 at 11:37 AM, Thomas Witkowski <span dir="ltr"><<a href="mailto:thomas.witkowski@tu-dresden.de" target="_blank">thomas.witkowski@tu-dresden.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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?</blockquote>
</div><br></div>