From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Mon, 2 Apr 2012 15:25:05 +0000 (+0000)
Subject: Add a TODO.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b72096b28a05e91ef6c25090956cb42206e8d653;p=dealii-svn.git

Add a TODO.


git-svn-id: https://svn.dealii.org/trunk@25365 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/examples/step-42/step-42.cc b/deal.II/examples/step-42/step-42.cc
index 0b68743923..fdf86e2354 100644
--- a/deal.II/examples/step-42/step-42.cc
+++ b/deal.II/examples/step-42/step-42.cc
@@ -976,6 +976,10 @@ void Step4<dim>::projection_active_set ()
 
   distributed_solution.compress(Insert);
 
+//TODO: since the active sets on different processors also store "ghost" elements,
+// i.e. constraints for DoFs that are locally_relevant but not locally_owned,
+// the following sum doesn't make much sense. We need to count the
+// *unique* elements
   unsigned int sum_contact_constraints = Utilities::MPI::sum(active_set.n_elements (), mpi_communicator);
   pcout << "Number of Contact-Constaints: " << sum_contact_constraints <<std::endl;