document test better

git-svn-id: https://svn.dealii.org/trunk@25736 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/tests/mpi/interpolate_03.cc b/tests/mpi/interpolate_03.cc
index 2ea336c9e985ee88004a235c388bf8a11d140e56..bbfa5afc32ab338fa403a13f6d9d635ff3908133 100644 (file)
--- a/tests/mpi/interpolate_03.cc
+++ b/tests/mpi/interpolate_03.cc
@@ -12,7 +12,10 @@
 //---------------------------------------------------------------------------
 
 
-// in Trilinos 10.12.1 interpolate() hangs with a small number of cells (smaller than the number of CPUs). This works fine in 10.4.2 and 10.8.5
+// In Trilinos 10.12.1 interpolate() hangs with a small number of cells (smaller than the number of CPUs). This works fine in 10.4.2 and 10.8.5
+// As it turns out, this is because vector creation after interpolate()
+// reacts differently in 10.12.1 and causes a hang. The bug is
+// that interpolate() does not call compress()!
 
 #include "../tests.h"
 #include "coarse_grid_common.h"