mirror of
https://gitlab.kitware.com/vtk/vtk-m
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83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
//============================================================================
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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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//
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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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#ifndef vtk_m_cont_AssignerPartitionedDataSet_h
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#define vtk_m_cont_AssignerPartitionedDataSet_h
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#include <vtkm/cont/vtkm_cont_export.h>
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#include <vtkm/Types.h>
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#include <vtkm/internal/ExportMacros.h>
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#include <vtkm/thirdparty/diy/Configure.h>
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#include <vector>
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#include <vtkm/thirdparty/diy/diy.h>
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#ifdef VTKM_MSVC
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#pragma warning(push)
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// disable C4275: non-dll interface base class warnings
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#pragma warning(disable : 4275)
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#endif
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namespace vtkm
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{
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namespace cont
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{
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class PartitionedDataSet;
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/// \brief Assigner for PartitionedDataSet partitions.
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///
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/// `AssignerPartitionedDataSet` is a `vtkmdiy::StaticAssigner` implementation
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/// that uses `PartitionedDataSet`'s partition distribution to build
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/// global-id/rank associations needed for several `diy` operations.
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/// It uses a contiguous assignment strategy to map partitions to global ids,
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/// i.e. partitions on rank 0 come first, then rank 1, etc. Any rank may have 0
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/// partitions.
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///
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/// AssignerPartitionedDataSet 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 partitions.
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///
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class VTKM_CONT_EXPORT AssignerPartitionedDataSet : public vtkmdiy::StaticAssigner
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{
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public:
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/// Initialize the assigner using a partitioned dataset.
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/// This may initialize collective operations to populate the assigner with
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/// information about partitions on all ranks.
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VTKM_CONT
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AssignerPartitionedDataSet(const vtkm::cont::PartitionedDataSet& pds);
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VTKM_CONT
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AssignerPartitionedDataSet(vtkm::Id num_partitions);
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VTKM_CONT
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~AssignerPartitionedDataSet() override;
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///@{
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/// vtkmdiy::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> IScanPartitionCounts;
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};
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}
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}
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#ifdef VTKM_MSVC
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#pragma warning(pop)
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#endif
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#endif
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