From b7bd88ddf3b2fe36575e11392799c403f26b59ce Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Sun, 7 Jul 2013 15:31:15 +0000
Subject: [PATCH] add test that documents bug in ConstraintMatrix::set_zero

git-svn-id: https://svn.dealii.org/trunk@29939 0785d39b-7218-0410-832d-ea1e28bc413d
---
 tests/mpi/constraint_matrix_set_zero_01.cc    | 80 +++++++++++++++++++
 .../ncpu_1/cmp/generic                        |  2 +
 .../ncpu_2/cmp/generic                        |  2 +
 3 files changed, 84 insertions(+)
 create mode 100644 tests/mpi/constraint_matrix_set_zero_01.cc
 create mode 100644 tests/mpi/constraint_matrix_set_zero_01/ncpu_1/cmp/generic
 create mode 100644 tests/mpi/constraint_matrix_set_zero_01/ncpu_2/cmp/generic

diff --git a/tests/mpi/constraint_matrix_set_zero_01.cc b/tests/mpi/constraint_matrix_set_zero_01.cc
new file mode 100644
index 0000000000..a90946cd2a
--- /dev/null
+++ b/tests/mpi/constraint_matrix_set_zero_01.cc
@@ -0,0 +1,80 @@
+//---------------------------------------------------------------------------
+//    $Id: constraint_matrix_condense_01.cc 29076 2013-03-27 15:08:37Z heister $
+//    Version: $Name$
+//
+//    Copyright (C) 2013 by the deal.II authors
+//
+//    This file is subject to QPL and may not be  distributed
+//    without copyright and license information. Please refer
+//    to the file deal.II/doc/license.html for the  text  and
+//    further information on this license.
+//
+//---------------------------------------------------------------------------
+
+
+// check ConstraintMatrix::set_zero(Vector) for parallel vectors.
+// this documents a bug introduced in r29678 for block vectors.
+
+#include "../tests.h"
+#include <deal.II/base/logstream.h>
+#include <deal.II/lac/petsc_parallel_vector.h>
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/dofs/dof_tools.h>
+#include <deal.II/fe/fe_q.h>
+#include <deal.II/lac/petsc_parallel_block_vector.h>
+
+#include <fstream>
+
+
+void test ()
+{
+  unsigned int myid = Utilities::MPI::this_mpi_process (MPI_COMM_WORLD);
+  unsigned int numproc = Utilities::MPI::n_mpi_processes (MPI_COMM_WORLD);
+ 
+  std::vector<IndexSet> local_active(2);
+
+  // block 0:
+  local_active[0].set_size(numproc);
+  local_active[0].add_range(myid,myid+1);
+
+  // block 1:
+  local_active[1].set_size(2*numproc);
+  local_active[1].add_range(myid*2,myid*2+2);
+
+  PETScWrappers::MPI::BlockVector v(local_active, MPI_COMM_WORLD);
+
+  for (unsigned int i=0;i<v.size();++i)
+    v(i)=1.0+i;
+  v.compress(VectorOperation::insert);
+
+  IndexSet local_active_together(3*numproc);
+  local_active_together.add_range(myid,myid+1);
+  local_active_together.add_range(numproc+myid*2,numproc+myid*2+2);
+  
+  ConstraintMatrix cm(local_active_together);
+  cm.add_line(numproc + myid*2);
+  cm.close();
+
+  deallog << "vector before:" << std::endl;  
+  v.print(deallog.get_file_stream());
+
+  deallog << "CM:" << std::endl;  
+  cm.print(deallog.get_file_stream());
+  
+  cm.set_zero(v);
+  
+  deallog << "vector after:" << std::endl;  
+  v.print(deallog.get_file_stream());
+
+  deallog << "OK" << std::endl;
+}
+
+
+int main(int argc, char *argv[])
+{
+  Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
+  MPILogInitAll log(__FILE__);
+
+  test();
+  return 0;
+}
diff --git a/tests/mpi/constraint_matrix_set_zero_01/ncpu_1/cmp/generic b/tests/mpi/constraint_matrix_set_zero_01/ncpu_1/cmp/generic
new file mode 100644
index 0000000000..0fd8fc12f0
--- /dev/null
+++ b/tests/mpi/constraint_matrix_set_zero_01/ncpu_1/cmp/generic
@@ -0,0 +1,2 @@
+
+DEAL::OK
diff --git a/tests/mpi/constraint_matrix_set_zero_01/ncpu_2/cmp/generic b/tests/mpi/constraint_matrix_set_zero_01/ncpu_2/cmp/generic
new file mode 100644
index 0000000000..0fd8fc12f0
--- /dev/null
+++ b/tests/mpi/constraint_matrix_set_zero_01/ncpu_2/cmp/generic
@@ -0,0 +1,2 @@
+
+DEAL::OK
-- 
2.39.5