mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 21:33:55 +00:00
85 lines
2.6 KiB
C++
85 lines
2.6 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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#include <vtkm/cont/AssignerPartitionedDataSet.h>
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#include <vtkm/cont/EnvironmentTracker.h>
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#include <vtkm/cont/PartitionedDataSet.h>
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#include <vtkm/thirdparty/diy/diy.h>
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#include <algorithm> // std::lower_bound
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#include <numeric> // std::iota
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namespace vtkm
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{
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namespace cont
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{
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VTKM_CONT
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AssignerPartitionedDataSet::AssignerPartitionedDataSet(const vtkm::cont::PartitionedDataSet& pds)
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: AssignerPartitionedDataSet(pds.GetNumberOfPartitions())
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{
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}
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VTKM_CONT
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AssignerPartitionedDataSet::AssignerPartitionedDataSet(vtkm::Id num_partitions)
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: vtkmdiy::StaticAssigner(vtkm::cont::EnvironmentTracker::GetCommunicator().size(), 1)
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, IScanPartitionCounts()
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{
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auto comm = vtkm::cont::EnvironmentTracker::GetCommunicator();
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if (comm.size() > 1)
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{
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vtkm::Id iscan;
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vtkmdiy::mpi::scan(comm, num_partitions, iscan, std::plus<vtkm::Id>());
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vtkmdiy::mpi::all_gather(comm, iscan, this->IScanPartitionCounts);
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}
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else
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{
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this->IScanPartitionCounts.push_back(num_partitions);
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}
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this->set_nblocks(static_cast<int>(this->IScanPartitionCounts.back()));
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}
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VTKM_CONT
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AssignerPartitionedDataSet::~AssignerPartitionedDataSet() {}
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VTKM_CONT
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void AssignerPartitionedDataSet::local_gids(int my_rank, std::vector<int>& gids) const
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{
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const size_t s_rank = static_cast<size_t>(my_rank);
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if (my_rank == 0)
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{
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assert(this->IScanPartitionCounts.size() > 0);
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gids.resize(static_cast<size_t>(this->IScanPartitionCounts[s_rank]));
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std::iota(gids.begin(), gids.end(), 0);
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}
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else if (my_rank > 0 && s_rank < this->IScanPartitionCounts.size())
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{
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gids.resize(static_cast<size_t>(this->IScanPartitionCounts[s_rank] -
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this->IScanPartitionCounts[s_rank - 1]));
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std::iota(gids.begin(), gids.end(), static_cast<int>(this->IScanPartitionCounts[s_rank - 1]));
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}
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}
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VTKM_CONT
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int AssignerPartitionedDataSet::rank(int gid) const
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{
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return static_cast<int>(std::lower_bound(this->IScanPartitionCounts.begin(),
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this->IScanPartitionCounts.end(),
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gid + 1) -
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this->IScanPartitionCounts.begin());
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}
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} // vtkm::cont
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} // vtkm
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