sparsity_tools.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2008 - 2019 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------

#ifndef dealii_sparsity_tools_h
#define dealii_sparsity_tools_h


#include <deal.II/base/config.h>

#include <deal.II/base/exceptions.h>

#include <deal.II/lac/block_sparsity_pattern.h>
#include <deal.II/lac/dynamic_sparsity_pattern.h>
#include <deal.II/lac/sparsity_pattern.h>

#include <memory>
#include <vector>

#ifdef DEAL_II_WITH_MPI
#  include <deal.II/base/index_set.h>

#  include <mpi.h>
#endif

DEAL_II_NAMESPACE_OPEN


namespace SparsityTools
{
  enum class Partitioner
  {
    metis = 0,
    zoltan
  };


  void
  partition(const SparsityPattern &    sparsity_pattern,
            const unsigned int         n_partitions,
            std::vector<unsigned int> &partition_indices,
            const Partitioner          partitioner = Partitioner::metis);


  void
  partition(const SparsityPattern &          sparsity_pattern,
            const std::vector<unsigned int> &cell_weights,
            const unsigned int               n_partitions,
            std::vector<unsigned int> &      partition_indices,
            const Partitioner                partitioner = Partitioner::metis);

  unsigned int
  color_sparsity_pattern(const SparsityPattern &    sparsity_pattern,
                         std::vector<unsigned int> &color_indices);

  void
  reorder_Cuthill_McKee(
    const DynamicSparsityPattern &                        sparsity,
    std::vector<DynamicSparsityPattern::size_type> &      new_indices,
    const std::vector<DynamicSparsityPattern::size_type> &starting_indices =
      std::vector<DynamicSparsityPattern::size_type>());

  void
  reorder_hierarchical(
    const DynamicSparsityPattern &                  sparsity,
    std::vector<DynamicSparsityPattern::size_type> &new_indices);

#ifdef DEAL_II_WITH_MPI

  void
  distribute_sparsity_pattern(
    DynamicSparsityPattern &                              dsp,
    const std::vector<DynamicSparsityPattern::size_type> &rows_per_cpu,
    const MPI_Comm &                                      mpi_comm,
    const IndexSet &                                      myrange);

  void
  distribute_sparsity_pattern(BlockDynamicSparsityPattern &dsp,
                              const std::vector<IndexSet> &owned_set_per_cpu,
                              const MPI_Comm &             mpi_comm,
                              const IndexSet &             myrange);

  void
  gather_sparsity_pattern(DynamicSparsityPattern &     dsp,
                          const std::vector<IndexSet> &owned_rows_per_processor,
                          const MPI_Comm &             mpi_comm,
                          const IndexSet &             ghost_range);

#endif


  DeclExceptionMsg(ExcMETISNotInstalled,
                   "The function you called requires METIS, but you did not "
                   "configure deal.II with METIS.");

  DeclException1(ExcInvalidNumberOfPartitions,
                 int,
                 << "The number of partitions you gave is " << arg1
                 << ", but must be greater than zero.");

  DeclException1(ExcMETISError,
                 int,
                 << "    An error with error number " << arg1
                 << " occurred while calling a METIS function");

  DeclException2(ExcInvalidArraySize,
                 int,
                 int,
                 << "The array has size " << arg1 << " but should have size "
                 << arg2);
  DeclExceptionMsg(
    ExcZOLTANNotInstalled,
    "The function you called requires ZOLTAN, but you did not "
    "configure deal.II with ZOLTAN or zoltan_cpp.h is not available.");
} // namespace SparsityTools

DEAL_II_NAMESPACE_CLOSE

#endif