Fix failure of multigrid on some OpenMPI versions

git-svn-id: https://svn.dealii.org/trunk@32259 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/source/dofs/dof_handler_policy.cc b/deal.II/source/dofs/dof_handler_policy.cc
index 3e71bbd9c17c30338b24819ac4ed0f1ac7765056..c8bb6d84f0abd7a4d297dc2061047123287a431e 100644 (file)
--- a/deal.II/source/dofs/dof_handler_policy.cc
+++ b/deal.II/source/dofs/dof_handler_policy.cc
@@ -1892,8 +1892,8 @@ namespace internal
             unsigned int sent=needs_to_get_cells.size();
             unsigned int recv=senders.size();
 
-            MPI_Reduce(&sent, &sum_send, 1, MPI_UNSIGNED, MPI_SUM, 56345, tr->get_communicator());
-            MPI_Reduce(&recv, &sum_recv, 1, MPI_UNSIGNED, MPI_SUM, 56346, tr->get_communicator());
+            MPI_Allreduce(&sent, &sum_send, 1, MPI_UNSIGNED, MPI_SUM, tr->get_communicator());
+            MPI_Allreduce(&recv, &sum_recv, 1, MPI_UNSIGNED, MPI_SUM, tr->get_communicator());
             Assert(sum_send==sum_recv, ExcInternalError());
           }
 #endif