dof_info.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2011 - 2020 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------


#ifndef dealii_matrix_free_dof_info_h
#define dealii_matrix_free_dof_info_h


#include <deal.II/base/config.h>

#include <deal.II/base/exceptions.h>
#include <deal.II/base/partitioner.h>
#include <deal.II/base/vectorization.h>

#include <deal.II/dofs/dof_handler.h>

#include <deal.II/lac/affine_constraints.h>
#include <deal.II/lac/dynamic_sparsity_pattern.h>

#include <deal.II/matrix_free/face_info.h>
#include <deal.II/matrix_free/mapping_info.h>
#include <deal.II/matrix_free/task_info.h>

#include <array>
#include <memory>


DEAL_II_NAMESPACE_OPEN

namespace internal
{
  namespace MatrixFreeFunctions
  {
    template <typename Number>
    struct ConstraintValues
    {
      ConstraintValues();

      template <typename number2>
      unsigned short
      insert_entries(
        const std::vector<std::pair<types::global_dof_index, number2>>
          &entries);

      std::vector<std::pair<types::global_dof_index, double>>
                                           constraint_entries;
      std::vector<types::global_dof_index> constraint_indices;

      std::pair<std::vector<Number>, types::global_dof_index> next_constraint;
      std::map<std::vector<Number>,
               types::global_dof_index,
               FPArrayComparator<Number>>
        constraints;
    };

    struct DoFInfo
    {
      static const unsigned int chunk_size_zero_vector = 64;

      DoFInfo();

      DoFInfo(const DoFInfo &) = default;

      void
      clear();

      unsigned int
      fe_index_from_degree(const unsigned int first_selected_component,
                           const unsigned int fe_degree) const;

      void
      get_dof_indices_on_cell_batch(std::vector<unsigned int> &locall_indices,
                                    const unsigned int         cell,
                                    const bool with_constraints = true) const;

      template <typename number>
      void
      read_dof_indices(
        const std::vector<types::global_dof_index> &local_indices,
        const std::vector<unsigned int> &           lexicographic_inv,
        const AffineConstraints<number> &           constraints,
        const unsigned int                          cell_number,
        ConstraintValues<double> &                  constraint_values,
        bool &                                      cell_at_boundary);

      void
      assign_ghosts(const std::vector<unsigned int> &boundary_cells);

      void
      reorder_cells(const TaskInfo &                  task_info,
                    const std::vector<unsigned int> & renumbering,
                    const std::vector<unsigned int> & constraint_pool_row_index,
                    const std::vector<unsigned char> &irregular_cells);

      void
      compute_cell_index_compression(
        const std::vector<unsigned char> &irregular_cells);

      template <int length>
      void
      compute_face_index_compression(
        const std::vector<FaceToCellTopology<length>> &faces);

      void
      make_connectivity_graph(const TaskInfo &                 task_info,
                              const std::vector<unsigned int> &renumbering,
                              DynamicSparsityPattern &connectivity) const;

      void
      compute_dof_renumbering(
        std::vector<types::global_dof_index> &renumbering);

      template <int length>
      void
      compute_vector_zero_access_pattern(
        const TaskInfo &                               task_info,
        const std::vector<FaceToCellTopology<length>> &faces);

      std::size_t
      memory_consumption() const;

      template <typename StreamType>
      void
      print_memory_consumption(StreamType &    out,
                               const TaskInfo &size_info) const;

      template <typename Number>
      void
      print(const std::vector<Number> &      constraint_pool_data,
            const std::vector<unsigned int> &constraint_pool_row_index,
            std::ostream &                   out) const;

      enum class IndexStorageVariants : unsigned char
      {
        full,
        interleaved,
        contiguous,
        interleaved_contiguous,
        interleaved_contiguous_strided,
        interleaved_contiguous_mixed_strides
      };

      enum DoFAccessIndex : unsigned char
      {
        dof_access_face_interior = 0,
        dof_access_face_exterior = 1,
        dof_access_cell = 2
      };

      unsigned int dimension;

      unsigned int vectorization_length;

      std::vector<IndexStorageVariants> index_storage_variants[3];

      std::vector<std::pair<unsigned int, unsigned int>> row_starts;

      std::vector<unsigned int> dof_indices;

      std::vector<std::pair<unsigned short, unsigned short>>
        constraint_indicator;

      std::vector<unsigned int> dof_indices_interleaved;

      std::vector<unsigned int> dof_indices_contiguous[3];

      std::vector<unsigned int> dof_indices_interleave_strides[3];

      std::vector<unsigned char> n_vectorization_lanes_filled[3];

      std::shared_ptr<const Utilities::MPI::Partitioner> vector_partitioner;

      std::array<std::shared_ptr<const Utilities::MPI::Partitioner>, 5>
        vector_partitioner_face_variants;

      std::vector<unsigned int> constrained_dofs;

      std::vector<unsigned int> row_starts_plain_indices;

      std::vector<unsigned int> plain_dof_indices;

      unsigned int global_base_element_offset;

      unsigned int n_base_elements;

      std::vector<unsigned int> n_components;

      std::vector<unsigned int> start_components;

      std::vector<unsigned int> component_to_base_index;

      std::vector<std::vector<unsigned int>> component_dof_indices_offset;

      std::vector<unsigned int> dofs_per_cell;

      std::vector<unsigned int> dofs_per_face;

      bool store_plain_indices;

      std::vector<unsigned int> cell_active_fe_index;

      unsigned int max_fe_index;

      std::vector<std::vector<unsigned int>> fe_index_conversion;

      std::vector<types::global_dof_index> ghost_dofs;

      std::vector<unsigned int> vector_zero_range_list_index;

      std::vector<std::pair<unsigned int, unsigned int>> vector_zero_range_list;

      std::vector<unsigned int> cell_loop_pre_list_index;

      std::vector<std::pair<unsigned int, unsigned int>> cell_loop_pre_list;

      std::vector<unsigned int> cell_loop_post_list_index;

      std::vector<std::pair<unsigned int, unsigned int>> cell_loop_post_list;
    };


    /*-------------------------- Inline functions ---------------------------*/

#ifndef DOXYGEN


    inline unsigned int
    DoFInfo::fe_index_from_degree(const unsigned int first_selected_component,
                                  const unsigned int fe_degree) const
    {
      const unsigned int n_indices = fe_index_conversion.size();
      if (n_indices <= 1)
        return 0;
      for (unsigned int i = 0; i < n_indices; ++i)
        if (fe_index_conversion[i][first_selected_component] == fe_degree)
          return i;
      return numbers::invalid_unsigned_int;
    }

#endif // ifndef DOXYGEN

  } // end of namespace MatrixFreeFunctions
} // end of namespace internal

DEAL_II_NAMESPACE_CLOSE

#endif