From ad1f0b55ad3edfd0001acce337dbb8dba7b9e48c Mon Sep 17 00:00:00 2001
From: kronbichler <kronbichler@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Tue, 21 May 2013 14:30:26 +0000
Subject: [PATCH] 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
---
 deal.II/source/lac/trilinos_precondition.cc | 1 +
 1 file changed, 1 insertion(+)

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);
-- 
2.39.5