/usr/include/deal.II/multigrid/mg_transfer.templates.h is in libdeal.ii-dev 8.4.2-2+b1.
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//
// Copyright (C) 2003 - 2016 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 at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef dealii__mg_transfer_templates_h
#define dealii__mg_transfer_templates_h
#include <deal.II/lac/trilinos_vector.h>
#include <deal.II/lac/sparse_matrix.h>
#include <deal.II/grid/tria_iterator.h>
#include <deal.II/fe/fe.h>
#include <deal.II/multigrid/mg_base.h>
#include <deal.II/dofs/dof_accessor.h>
#include <deal.II/multigrid/mg_tools.h>
#include <deal.II/multigrid/mg_transfer.h>
#include <deal.II/distributed/tria.h>
#include <algorithm>
// Here you can turn on some cout statements and MPI Barriers for debugging:
//#define DEBUG_OUTPUT
DEAL_II_NAMESPACE_OPEN
namespace
{
/**
* Adjust vectors on all levels to correct size. Here, we just count the
* numbers of degrees of freedom on each level and @p reinit each level
* vector to this length. For compatibility reasons with the next function
* the target_component is added here but is not used.
*/
template <int dim, typename number, int spacedim>
void
reinit_vector (const dealii::DoFHandler<dim,spacedim> &mg_dof,
const std::vector<unsigned int> &,
MGLevelObject<dealii::Vector<number> > &v)
{
for (unsigned int level=v.min_level();
level<=v.max_level(); ++level)
{
unsigned int n = mg_dof.n_dofs (level);
v[level].reinit(n);
}
}
/**
* Adjust vectors on all levels to correct size. Here, we just count the
* numbers of degrees of freedom on each level and @p reinit each level
* vector to this length. The target_component is handed to
* MGTools::count_dofs_per_block. See for documentation there.
*/
template <int dim, typename number, int spacedim>
void
reinit_vector (const dealii::DoFHandler<dim,spacedim> &mg_dof,
std::vector<unsigned int> target_component,
MGLevelObject<BlockVector<number> > &v)
{
const unsigned int n_blocks = mg_dof.get_fe().n_blocks();
if (target_component.size()==0)
{
target_component.resize(n_blocks);
for (unsigned int i=0; i<n_blocks; ++i)
target_component[i] = i;
}
Assert(target_component.size()==n_blocks,
ExcDimensionMismatch(target_component.size(),n_blocks));
const unsigned int max_block
= *std::max_element (target_component.begin(),
target_component.end());
const unsigned int n_target_blocks = max_block + 1;
std::vector<std::vector<types::global_dof_index> >
ndofs(mg_dof.get_triangulation().n_levels(),
std::vector<types::global_dof_index>(n_target_blocks));
MGTools::count_dofs_per_block (mg_dof, ndofs, target_component);
for (unsigned int level=v.min_level();
level<=v.max_level(); ++level)
{
v[level].reinit(n_target_blocks);
for (unsigned int b=0; b<n_target_blocks; ++b)
v[level].block(b).reinit(ndofs[level][b]);
v[level].collect_sizes();
}
}
/**
* Adjust vectors on all levels to correct size. Here, we just count the
* numbers of degrees of freedom on each level and @p reinit each level
* vector to this length.
*/
template <int dim, typename number, int spacedim>
void
reinit_vector (const dealii::DoFHandler<dim,spacedim> &mg_dof,
const std::vector<unsigned int> &,
MGLevelObject<parallel::distributed::Vector<number> > &v)
{
const parallel::Triangulation<dim,spacedim> *tria =
(dynamic_cast<const parallel::Triangulation<dim,spacedim>*>
(&mg_dof.get_triangulation()));
for (unsigned int level=v.min_level(); level<=v.max_level(); ++level)
{
if (v[level].size() != mg_dof.locally_owned_mg_dofs(level).size() ||
v[level].local_size() != mg_dof.locally_owned_mg_dofs(level).n_elements())
v[level].reinit(mg_dof.locally_owned_mg_dofs(level), tria != 0 ?
tria->get_communicator() : MPI_COMM_SELF);
else
v[level] = 0.;
}
}
#ifdef DEAL_II_WITH_TRILINOS
/**
* Adjust vectors on all levels to correct size. Here, we just count the
* numbers of degrees of freedom on each level and @p reinit each level
* vector to this length.
*/
template <int dim, int spacedim>
void
reinit_vector (const dealii::DoFHandler<dim,spacedim> &mg_dof,
const std::vector<unsigned int> &,
MGLevelObject<TrilinosWrappers::MPI::Vector> &v)
{
const dealii::parallel::distributed::Triangulation<dim,spacedim> *tria =
(dynamic_cast<const parallel::distributed::Triangulation<dim,spacedim>*>
(&mg_dof.get_triangulation()));
AssertThrow(tria!=NULL, ExcMessage("multigrid with Trilinos vectors only works with distributed Triangulation!"));
#ifdef DEAL_II_WITH_P4EST
for (unsigned int level=v.min_level();
level<=v.max_level(); ++level)
{
v[level].reinit(mg_dof.locally_owned_mg_dofs(level), tria->get_communicator());
}
#else
(void)v;
#endif
}
#endif
}
/* ------------------ MGLevelGlobalTransfer<VectorType> ----------------- */
namespace internal
{
// generic copy function of two different vectors -> need to access each
// individual entry
template <typename T, typename V>
void copy_vector (const std::vector<std::pair<types::global_dof_index,types::global_dof_index> > ©_indices,
const T &src,
V &dst)
{
// we should have i->second == i->first, therefore we can use the same
// function for both copying to mg as well as copying from mg
for (std::vector<std::pair<types::global_dof_index, types::global_dof_index> >::
const_iterator i = copy_indices.begin(); i != copy_indices.end(); ++i)
dst(i->first) = src(i->first);
dst.compress(VectorOperation::insert);
}
// specialized copy function for the same vector
template <typename T>
void copy_vector (const std::vector<std::pair<types::global_dof_index,types::global_dof_index> > &,
const T &src,
T &dst)
{
dst = src;
}
}
template <typename VectorType>
template <int dim, class InVector, int spacedim>
void
MGLevelGlobalTransfer<VectorType>::copy_to_mg
(const DoFHandler<dim,spacedim> &mg_dof_handler,
MGLevelObject<VectorType> &dst,
const InVector &src) const
{
reinit_vector(mg_dof_handler, component_to_block_map, dst);
bool first = true;
#ifdef DEBUG_OUTPUT
std::cout << "copy_to_mg src " << src.l2_norm() << std::endl;
MPI_Barrier(MPI_COMM_WORLD);
#endif
if (perform_plain_copy)
{
// if the finest multigrid level covers the whole domain (i.e., no
// adaptive refinement) and the numbering of the finest level DoFs and
// the global DoFs are the same, we can do a plain copy
AssertDimension(dst[dst.max_level()].size(), src.size());
internal::copy_vector(copy_indices[dst.max_level()], src, dst[dst.max_level()]);
// do the initial restriction
for (unsigned int level=mg_dof_handler.get_triangulation().n_global_levels()-1; level != 0; )
{
--level;
this->restrict_and_add (level+1, dst[level], dst[level+1]);
}
return;
}
for (unsigned int level=mg_dof_handler.get_triangulation().n_global_levels(); level != 0;)
{
--level;
#ifdef DEBUG_OUTPUT
MPI_Barrier(MPI_COMM_WORLD);
#endif
typedef std::vector<std::pair<types::global_dof_index, types::global_dof_index> >::const_iterator dof_pair_iterator;
VectorType &dst_level = dst[level];
// first copy local unknowns
for (dof_pair_iterator i = copy_indices[level].begin();
i != copy_indices[level].end(); ++i)
dst_level(i->second) = src(i->first);
// Do the same for the indices where the global index is local, but the
// local index is not
for (dof_pair_iterator i = copy_indices_global_mine[level].begin();
i != copy_indices_global_mine[level].end(); ++i)
dst_level(i->second) = src(i->first);
dst_level.compress(VectorOperation::insert);
#ifdef DEBUG_OUTPUT
MPI_Barrier(MPI_COMM_WORLD);
std::cout << "copy_to_mg dst " << level << " " << dst_level.l2_norm() << std::endl;
#endif
if (!first)
{
this->restrict_and_add (level+1, dst[level], dst[level+1]);
#ifdef DEBUG_OUTPUT
std::cout << "copy_to_mg restr&add " << level << " " << dst_level.l2_norm() << std::endl;
#endif
}
first = false;
}
}
template <typename VectorType>
template <int dim, class OutVector, int spacedim>
void
MGLevelGlobalTransfer<VectorType>::copy_from_mg
(const DoFHandler<dim,spacedim> &mg_dof_handler,
OutVector &dst,
const MGLevelObject<VectorType> &src) const
{
if (perform_plain_copy)
{
AssertDimension(dst.size(), src[src.max_level()].size());
internal::copy_vector(copy_indices[src.max_level()], src[src.max_level()], dst);
return;
}
// For non-DG: degrees of freedom in the refinement face may need special
// attention, since they belong to the coarse level, but have fine level
// basis functions
dst = 0;
for (unsigned int level=0; level<mg_dof_handler.get_triangulation().n_global_levels(); ++level)
{
#ifdef DEBUG_OUTPUT
MPI_Barrier(MPI_COMM_WORLD);
std::cout << "copy_from_mg src " << level << " " << src[level].l2_norm() << std::endl;
MPI_Barrier(MPI_COMM_WORLD);
#endif
typedef std::vector<std::pair<types::global_dof_index, types::global_dof_index> >::const_iterator dof_pair_iterator;
const VectorType &src_level = src[level];
// First copy all indices local to this process
for (dof_pair_iterator i = copy_indices[level].begin();
i != copy_indices[level].end(); ++i)
dst(i->first) = src_level(i->second);
// Do the same for the indices where the level index is local, but the
// global index is not
for (dof_pair_iterator i = copy_indices_level_mine[level].begin();
i != copy_indices_level_mine[level].end(); ++i)
dst(i->first) = src_level(i->second);
#ifdef DEBUG_OUTPUT
{
dst.compress(VectorOperation::insert);
MPI_Barrier(MPI_COMM_WORLD);
std::cout << "copy_from_mg level=" << level << " " << dst.l2_norm() << std::endl;
}
#endif
}
dst.compress(VectorOperation::insert);
#ifdef DEBUG_OUTPUT
MPI_Barrier(MPI_COMM_WORLD);
std::cout << "copy_from_mg " << dst.l2_norm() << std::endl;
#endif
}
template <typename VectorType>
template <int dim, class OutVector, int spacedim>
void
MGLevelGlobalTransfer<VectorType>::copy_from_mg_add
(const DoFHandler<dim,spacedim> &mg_dof_handler,
OutVector &dst,
const MGLevelObject<VectorType> &src) const
{
// For non-DG: degrees of freedom in the refinement face may need special
// attention, since they belong to the coarse level, but have fine level
// basis functions
for (unsigned int level=0; level<mg_dof_handler.get_triangulation().n_global_levels(); ++level)
{
typedef std::vector<std::pair<types::global_dof_index, types::global_dof_index> >::const_iterator dof_pair_iterator;
const VectorType &src_level = src[level];
// First add all indices local to this process
for (dof_pair_iterator i = copy_indices[level].begin();
i != copy_indices[level].end(); ++i)
dst(i->first) += src_level(i->second);
// Do the same for the indices where the level index is local, but the
// global index is not
for (dof_pair_iterator i = copy_indices_level_mine[level].begin();
i != copy_indices_level_mine[level].end(); ++i)
dst(i->first) += src_level(i->second);
}
dst.compress(VectorOperation::add);
}
template <typename VectorType>
void
MGLevelGlobalTransfer<VectorType>::
set_component_to_block_map (const std::vector<unsigned int> &map)
{
component_to_block_map = map;
}
/* --------- MGLevelGlobalTransfer<parallel::distributed::Vector> ------- */
template <typename Number>
template <int dim, typename Number2, int spacedim>
void
MGLevelGlobalTransfer<parallel::distributed::Vector<Number> >::copy_to_mg
(const DoFHandler<dim,spacedim> &mg_dof_handler,
MGLevelObject<parallel::distributed::Vector<Number> > &dst,
const parallel::distributed::Vector<Number2> &src) const
{
reinit_vector(mg_dof_handler, component_to_block_map, dst);
bool first = true;
if (perform_plain_copy)
{
// In this case, we can simply copy the local range (in parallel by
// VectorView)
AssertDimension(dst[dst.max_level()].local_size(), src.local_size());
VectorView<Number> dst_view (src.local_size(), dst[dst.max_level()].begin());
VectorView<Number2> src_view (src.local_size(), src.begin());
static_cast<Vector<Number> &>(dst_view) = static_cast<Vector<Number2> &>(src_view);
// do the initial restriction
for (unsigned int level=mg_dof_handler.get_triangulation().n_global_levels()-1; level != 0; )
{
--level;
this->restrict_and_add (level+1, dst[level], dst[level+1]);
}
return;
}
// the ghosted vector should already have the correct local size (but
// different parallel layout)
AssertDimension(ghosted_global_vector.local_size(), src.local_size());
// copy the source vector to the temporary vector that we hold for the
// purpose of data exchange
ghosted_global_vector = src;
ghosted_global_vector.update_ghost_values();
for (unsigned int level=mg_dof_handler.get_triangulation().n_global_levels(); level != 0;)
{
--level;
typedef std::vector<std::pair<unsigned int, unsigned int> >::const_iterator dof_pair_iterator;
parallel::distributed::Vector<Number> &dst_level = dst[level];
// first copy local unknowns
for (dof_pair_iterator i = copy_indices[level].begin();
i != copy_indices[level].end(); ++i)
dst_level.local_element(i->second) = ghosted_global_vector.local_element(i->first);
// Do the same for the indices where the level index is local, but the
// global index is not
for (dof_pair_iterator i = copy_indices_level_mine[level].begin();
i != copy_indices_level_mine[level].end(); ++i)
dst_level.local_element(i->second) = ghosted_global_vector.local_element(i->first);
dst_level.compress(VectorOperation::insert);
if (!first)
{
this->restrict_and_add (level+1, dst_level, dst[level+1]);
}
first = false;
}
}
template <typename Number>
template <int dim, typename Number2, int spacedim>
void
MGLevelGlobalTransfer<parallel::distributed::Vector<Number> >::copy_from_mg
(const DoFHandler<dim,spacedim> &mg_dof_handler,
parallel::distributed::Vector<Number2> &dst,
const MGLevelObject<parallel::distributed::Vector<Number> > &src) const
{
if (perform_plain_copy)
{
// In this case, we can simply copy the local range (in parallel by
// VectorView). To avoid having stray data in ghost entries of the
// destination, make sure to clear them here.
dst.zero_out_ghosts();
AssertDimension(dst.local_size(), src[src.max_level()].local_size());
VectorView<Number2> dst_view (dst.local_size(), dst.begin());
VectorView<Number> src_view (dst.local_size(), src[src.max_level()].begin());
static_cast<Vector<Number2> &>(dst_view) = static_cast<Vector<Number> &>(src_view);
return;
}
// For non-DG: degrees of freedom in the refinement face may need special
// attention, since they belong to the coarse level, but have fine level
// basis functions
dst = 0;
for (unsigned int level=0; level<mg_dof_handler.get_triangulation().n_global_levels(); ++level)
{
typedef std::vector<std::pair<unsigned int, unsigned int> >::const_iterator dof_pair_iterator;
// the ghosted vector should already have the correct local size (but
// different parallel layout)
AssertDimension(ghosted_level_vector[level].local_size(),
src[level].local_size());
// the first time around, we copy the source vector to the temporary
// vector that we hold for the purpose of data exchange
parallel::distributed::Vector<Number> &ghosted_vector =
ghosted_level_vector[level];
ghosted_vector = src[level];
ghosted_vector.update_ghost_values();
// first copy local unknowns
for (dof_pair_iterator i = copy_indices[level].begin();
i != copy_indices[level].end(); ++i)
dst.local_element(i->first) = ghosted_vector.local_element(i->second);
// Do the same for the indices where the level index is local, but the
// global index is not
for (dof_pair_iterator i = copy_indices_global_mine[level].begin();
i != copy_indices_global_mine[level].end(); ++i)
dst.local_element(i->first) = ghosted_vector.local_element(i->second);
}
dst.compress(VectorOperation::insert);
}
template <typename Number>
template <int dim, typename Number2, int spacedim>
void
MGLevelGlobalTransfer<parallel::distributed::Vector<Number> >::copy_from_mg_add
(const DoFHandler<dim,spacedim> &mg_dof_handler,
parallel::distributed::Vector<Number2> &dst,
const MGLevelObject<parallel::distributed::Vector<Number> > &src) const
{
// For non-DG: degrees of freedom in the refinement face may need special
// attention, since they belong to the coarse level, but have fine level
// basis functions
dst.zero_out_ghosts();
for (unsigned int level=0; level<mg_dof_handler.get_triangulation().n_global_levels(); ++level)
{
typedef std::vector<std::pair<unsigned int, unsigned int> >::const_iterator dof_pair_iterator;
// the ghosted vector should already have the correct local size (but
// different parallel layout)
AssertDimension(ghosted_level_vector[level].local_size(),
src[level].local_size());
// the first time around, we copy the source vector to the temporary
// vector that we hold for the purpose of data exchange
parallel::distributed::Vector<Number> &ghosted_vector =
ghosted_level_vector[level];
ghosted_vector = src[level];
ghosted_vector.update_ghost_values();
// first add local unknowns
for (dof_pair_iterator i= copy_indices[level].begin();
i != copy_indices[level].end(); ++i)
dst.local_element(i->first) += ghosted_vector.local_element(i->second);
// Do the same for the indices where the level index is local, but the
// global index is not
for (dof_pair_iterator i= copy_indices_global_mine[level].begin();
i != copy_indices_global_mine[level].end(); ++i)
dst.local_element(i->first) += ghosted_vector.local_element(i->second);
}
dst.compress(VectorOperation::add);
}
template <typename Number>
void
MGLevelGlobalTransfer<parallel::distributed::Vector<Number> >::
set_component_to_block_map (const std::vector<unsigned int> &map)
{
component_to_block_map = map;
}
DEAL_II_NAMESPACE_CLOSE
#endif
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