subdomain_partitioner.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
 
// This library is free software; you can 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.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 
 
// Local Includes
#include "libmesh/subdomain_partitioner.h"
#include "libmesh/elem.h"
#include "libmesh/enum_partitioner_type.h"
#include "libmesh/int_range.h"
#include "libmesh/libmesh_logging.h"
#include "libmesh/metis_partitioner.h"
 
namespace libMesh
{
 
SubdomainPartitioner::SubdomainPartitioner () :
  _internal_partitioner(std::make_unique<MetisPartitioner>())
{}
 
 
SubdomainPartitioner::SubdomainPartitioner (const SubdomainPartitioner & other)
  : Partitioner(other),
    chunks(other.chunks),
    _internal_partitioner(other._internal_partitioner->clone())
{}
 
 
PartitionerType SubdomainPartitioner::type() const
{
  return SUBDOMAIN_PARTITIONER;
}
 
 
void SubdomainPartitioner::_do_partition (MeshBase & mesh,
                                          const unsigned int n)
{
  libmesh_assert_greater (n, 0);
 
  // Check for an easy return.  If the user has not specified any
  // entries in the chunks vector, we just do a single partitioning.
  if ((n == 1) || chunks.empty())
    {
      this->single_partition (mesh);
      return;
    }
 
  // Now actually do the partitioning.
  LOG_SCOPE ("_do_partition()", "SubdomainPartitioner");
 
  // For each chunk, construct an iterator range for the set of
  // subdomains in question, and pass it to the internal Partitioner.
  for (const auto & id_set : chunks)
    _internal_partitioner->
      partition_range(mesh,
                      mesh.active_subdomain_set_elements_begin(id_set),
                      mesh.active_subdomain_set_elements_end(id_set),
                      n);
}
 
} // namespace libMesh