From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Tue, 21 May 2013 14:30:26 +0000 (+0000)
Subject: Use better max coarse size for Trilinos AMG preconditioner. The default (128) is... 
X-Git-Tag: v8.0.0~497
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c9763abbd947e5f8eb4aa4ad3f1dc3693d3c3764;p=dealii.git

Use better max coarse size for Trilinos AMG preconditioner. The default (128) is way too small; a direct solver with not more than 2000 entries is very quick indeed.

git-svn-id: https://svn.dealii.org/trunk@29539 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/source/lac/trilinos_precondition.cc b/deal.II/source/lac/trilinos_precondition.cc
index b57d0d403e..e812285533 100644
--- a/deal.II/source/lac/trilinos_precondition.cc
+++ b/deal.II/source/lac/trilinos_precondition.cc
@@ -566,6 +566,7 @@ namespace TrilinosWrappers
                        static_cast<int>(additional_data.smoother_overlap));
     parameter_list.set("aggregation: threshold",
                        additional_data.aggregation_threshold);
+    parameter_list.set("coarse: max size", 2000);
 
     if (additional_data.output_details)
       parameter_list.set("ML output", 10);