mirror of
https://gitlab.kitware.com/vtk/vtk-m
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71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
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//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2015 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 Los Alamos National Security.
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_cont_AssignerMultiBlock_h
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#define vtk_m_cont_AssignerMultiBlock_h
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#include <vtkm/internal/Configure.h>
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#if defined(VTKM_ENABLE_MPI)
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#include <diy/assigner.hpp>
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#include <vtkm/cont/MultiBlock.h>
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namespace vtkm
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{
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namespace cont
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{
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/// \brief Assigner for `MultiBlock` blocks.
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///
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/// `AssignerMultiBlock` is a `diy::Assigner` implementation that uses
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/// `MultiBlock`'s block distribution to build global-id/rank associations
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/// needed for several `diy` operations.
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/// It uses a contiguous assignment strategy to map blocks to global ids i.e.
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/// blocks on rank 0 come first, then rank 1, etc. Any rank may have 0 blocks.
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///
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/// AssignerMultiBlock uses collectives in the constructor hence it is
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/// essential it gets created on all ranks irrespective of whether the rank has
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/// any blocks.
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///
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class VTKM_CONT_EXPORT AssignerMultiBlock : public diy::Assigner
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{
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public:
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/// Initialize the assigner using a multiblock dataset.
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/// This may initialize collective operations to populate the assigner with
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/// information about blocks on all ranks.
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VTKM_CONT
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AssignerMultiBlock(const vtkm::cont::MultiBlock& mb);
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///@{
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/// diy::Assigner API implementation.
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VTKM_CONT
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void local_gids(int rank, std::vector<int>& gids) const override;
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VTKM_CONT
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int rank(int gid) const override;
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//@}
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private:
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std::vector<vtkm::Id> IScanBlockCounts;
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};
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}
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}
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#endif // defined(VTKM_ENABLE_MPI)
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#endif
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