document bug in parallel::distributed::refine_and_coarsen*() with more CPUs than...

git-svn-id: https://svn.dealii.org/trunk@24210 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/tests/mpi/refine_and_coarsen_fixed_number_06.cc b/tests/mpi/refine_and_coarsen_fixed_number_06.cc
new file mode 100644 (file)
index 0000000..0b03266
--- /dev/null
+++ b/tests/mpi/refine_and_coarsen_fixed_number_06.cc
@@ -0,0 +1,91 @@
+//---------------------------------------------------------------------------
+//    $Id: simple_mpi_01.cc 23327 2011-02-11 03:19:07Z bangerth $
+//    Version: $Name$
+//
+//    Copyright (C) 2009 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.
+//
+//---------------------------------------------------------------------------
+
+
+// document bug in parallel::distributed::GridRefinement
+// ::refine_and_coarsen_fixed_number() and fixed_fraction() with one CPU with
+// 0 cells:
+//#0  0x00007ffff67297e2 in dealii::(anonymous namespace)::min_element<float> (
+//    criteria=...)
+//    at /w/heister/deal-trunk/deal.II/source/distributed/grid_refinement.cc:57
+//#1  0x00007ffff6727672 in dealii::(anonymous namespace)::compute_global_min_and_max_at_root<float> (criteria=..., mpi_communicator=0x6fc860)
+//    at /w/heister/deal-trunk/deal.II/source/distributed/grid_refinement.cc:82
+//#2  0x00007ffff672b4ef in dealii::parallel::distributed::GridRefinement::refine_and_coarsen_fixed_number<2, dealii::Vector<float>, 2>
+
+#include "../tests.h"
+
+#include <deal.II/lac/compressed_simple_sparsity_pattern.h>
+#include <deal.II/base/logstream.h>
+#include <deal.II/base/utilities.h>
+#include <deal.II/distributed/tria.h>
+#include <deal.II/distributed/grid_refinement.h>
+#include <deal.II/grid/grid_refinement.h>
+#include <deal.II/grid/grid_generator.h>
+#include <fstream>
+//#include <mpi.h>
+
+template <int dim>
+void test()
+{
+  unsigned int myid = Utilities::System::get_this_mpi_process (MPI_COMM_WORLD);
+  unsigned int numprocs = Utilities::System::get_n_mpi_processes (MPI_COMM_WORLD);
+
+  parallel::distributed::Triangulation<dim> triangulation(MPI_COMM_WORLD);
+  GridGenerator::hyper_cube (triangulation);
+  
+  Vector<float> estimated_error_per_cell (triangulation.n_active_cells());
+  parallel::distributed::GridRefinement::
+    refine_and_coarsen_fixed_number (triangulation,
+                                    estimated_error_per_cell,
+                                    0.3, 0.03);
+  parallel::distributed::GridRefinement::
+    refine_and_coarsen_fixed_fraction (triangulation,
+                                    estimated_error_per_cell,
+                                    0.3, 0.03);
+  triangulation.execute_coarsening_and_refinement ();
+
+  if (myid==0)
+       deallog << "n_global_active_cells=" 
+       << triangulation.n_global_active_cells()
+       << std::endl;
+  
+  if (myid==0)
+    deallog << "OK" << std::endl;
+}
+
+
+int main(int argc, char *argv[])
+{
+#ifdef DEAL_II_COMPILER_SUPPORTS_MPI
+  MPI_Init (&argc,&argv);
+#else
+  (void)argc;
+  (void)argv;
+#endif
+
+  if (Utilities::System::get_this_mpi_process (MPI_COMM_WORLD) == 0)
+    {
+      std::ofstream logfile(output_file_for_mpi("refine_and_coarsen_fixed_number_06").c_str());
+      deallog.attach(logfile);
+      deallog.depth_console(0);
+      deallog.threshold_double(1.e-10);
+
+      test<2>();
+    }
+  else
+    test<2>();
+
+#ifdef DEAL_II_COMPILER_SUPPORTS_MPI
+  MPI_Finalize();
+#endif
+}

diff --git a/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_1/cmp/generic b/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_1/cmp/generic
new file mode 100644 (file)
index 0000000..76a3add
--- /dev/null
+++ b/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_1/cmp/generic
@@ -0,0 +1,4 @@
+
+DEAL::Running on 1 CPU(s).
+DEAL::2nd try
+DEAL::done

diff --git a/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_10/cmp/generic b/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_10/cmp/generic
new file mode 100644 (file)
index 0000000..729abc0
--- /dev/null
+++ b/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_10/cmp/generic
@@ -0,0 +1,4 @@
+
+DEAL::Running on 10 CPU(s).
+DEAL::2nd try
+DEAL::done

diff --git a/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_4/cmp/generic b/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_4/cmp/generic
new file mode 100644 (file)
index 0000000..25e3150
--- /dev/null
+++ b/tests/mpi/refine_and_coarsen_fixed_number_06/ncpu_4/cmp/generic
@@ -0,0 +1,4 @@
+
+DEAL::Running on 4 CPU(s).
+DEAL::2nd try
+DEAL::done