MetisGraphGather.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
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/* MetisGraphGather.h                                          (C) 2000-2024 */
/*                                                                           */
/* Gathering of 'Parmetis' graphs.                                           */
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#ifndef ARCANE_STD_INTERNAL_METISGRAPHGATHER
#define ARCANE_STD_INTERNAL_METISGRAPHGATHER
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#include "arcane/utils/Array.h"
#include "arcane/utils/String.h"
#include "arcane/utils/TraceAccessor.h"
 
#include "arcane/core/ArcaneTypes.h"
 
#include "arcane/std/internal/MetisGraph.h"
 
#include <parmetis.h>
#include <mpi.h>
 
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namespace Arcane
{
 
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class MetisGraphGather
: public TraceAccessor
{
 public:
 
  explicit MetisGraphGather(IParallelMng* pm);
 
 public:

  void gatherGraph(const bool need_part, ConstArrayView<idx_t> vtxdist, const int ncon, MetisGraphView my_graph,
                   MetisGraph& graph);

  void scatterPart(ConstArrayView<idx_t> vtxdist, ConstArrayView<idx_t> part, ArrayView<idx_t> my_part);
 
 private:
 
  IParallelMng* m_parallel_mng = nullptr;
  Int32 m_my_rank = A_NULL_RANK;
  Int32 m_nb_rank = A_NULL_RANK;
 
 private:
 
  template <class SourceType, class TargetType>
  void _convertVector(const int size, ConstArrayView<SourceType> src, ArrayView<TargetType> dest);
};
 
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} // End namespace Arcane
 
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#endif