partition_map.h

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/*
 * Copyright (c) 2011-2015:  G-CSC, Goethe University Frankfurt
 * Author: Sebastian Reiter
 * 
 * This file is part of UG4.
 * 
 * UG4 is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 3 (as published by the
 * Free Software Foundation) with the following additional attribution
 * requirements (according to LGPL/GPL v3 §7):
 * 
 * (1) The following notice must be displayed in the Appropriate Legal Notices
 * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (2) The following notice must be displayed at a prominent place in the
 * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (3) The following bibliography is recommended for citation and must be
 * preserved in all covered files:
 * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
 *   parallel geometric multigrid solver on hierarchically distributed grids.
 *   Computing and visualization in science 16, 4 (2013), 151-164"
 * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
 *   flexible software system for simulating pde based models on high performance
 *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
 * 
 * This program 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.
 */
 
#ifndef __H__UG__partition_map__
#define __H__UG__partition_map__
 
#include "lib_grid/file_io/file_io.h"
#include "lib_grid/grid/grid.h"
#include "lib_grid/tools/subset_handler_grid.h"
#include "common/util/smart_pointer.h"
 
namespace ug
{
 
 
class PartitionMap{
  public:
    PartitionMap();
 
    void clear();
 
    void assign_grid(Grid& grid);
 
    SmartPtr<SubsetHandler> get_partition_handler();
 
    void add_target_proc(int tarProcRank);
 
    void add_target_procs(int first, int num);
 
    size_t num_target_procs();
 
    int get_target_proc(size_t index);
 
    int* get_target_procs();
 
    std::vector<int>& get_target_proc_vec();
 
    bool change_target_proc(size_t index, int newRank);
 
    int find_target_proc(int procRank);
 
    void shift_target_procs(int offset);
 
  private:
    SmartPtr<SubsetHandler> m_shPartitions;
    std::vector<int>    m_targetProcs;
};
 
typedef SmartPtr<PartitionMap>  SPPartitionMap;
 
 
 
 
template <class TAPos>
bool SavePartitionMapToFile(PartitionMap& pm, const char* filename,
              TAPos& aPos)
{
  SubsetHandler& partsh = *pm.get_partition_handler();
 
//  make sure that a grid exists
  if(!partsh.grid()){
    UG_LOG("WARNING IN SavePartitionMapToFile: a grid has to be assigned "
        "to the PartitionMap. Aborting.\n");
    return false;
  }
 
  Grid& grid = *partsh.grid();
 
//  we need a subset-handler, which will have a 1-1 subset-process relation.
  SubsetHandler sh(grid);
 
//  add all partitions to the handler
  for(int si = 0; si < partsh.num_subsets(); ++si){
    int newSI = pm.get_target_proc(si);
    sh.assign_subset(partsh.begin<Vertex>(si),
             partsh.end<Vertex>(si), newSI);
    sh.assign_subset(partsh.begin<Edge>(si),
             partsh.end<Edge>(si), newSI);
    sh.assign_subset(partsh.begin<Face>(si),
             partsh.end<Face>(si), newSI);
    sh.assign_subset(partsh.begin<Volume>(si),
             partsh.end<Volume>(si), newSI);
  }
 
//  now save the grid to file
  return SaveGridToFile(grid, sh, filename, aPos);
}
 
}// end of namespace
 
#endif