#include <deal.II/multigrid/mg_transfer.h>

Inheritance diagram for MGTransferPrebuilt< VectorType >:

Public Member Functions
	MGTransferPrebuilt ()=default

	MGTransferPrebuilt (const MGConstrainedDoFs &mg_constrained_dofs)

virtual	~MGTransferPrebuilt () override=default

void	initialize_constraints (const MGConstrainedDoFs &mg_constrained_dofs)

void	clear ()

template<int dim, int spacedim>
void	build (const DoFHandler< dim, spacedim > &dof_handler)

template<int dim, int spacedim>
void	build_matrices (const DoFHandler< dim, spacedim > &dof_handler)

virtual void	prolongate (const unsigned int to_level, VectorType &dst, const VectorType &src) const override

virtual void	restrict_and_add (const unsigned int from_level, VectorType &dst, const VectorType &src) const override

std::size_t	memory_consumption () const

void	print_matrices (std::ostream &os) const

template<int dim, class InVector , int spacedim>
void	copy_to_mg (const DoFHandler< dim, spacedim > &dof_handler, MGLevelObject< VectorType > &dst, const InVector &src) const

template<int dim, class OutVector , int spacedim>
void	copy_from_mg (const DoFHandler< dim, spacedim > &dof_handler, OutVector &dst, const MGLevelObject< VectorType > &src) const

template<int dim, class OutVector , int spacedim>
void	copy_from_mg_add (const DoFHandler< dim, spacedim > &dof_handler, OutVector &dst, const MGLevelObject< VectorType > &src) const

void	set_component_to_block_map (const std::vector< unsigned int > &map)

void	print_indices (std::ostream &os) const

virtual void	prolongate_and_add (const unsigned int to_level, VectorType &dst, const VectorType &src) const

Static Public Member Functions
static ::ExceptionBase &	ExcNoProlongation ()

static ::ExceptionBase &	ExcMatricesNotBuilt ()

Protected Member Functions
template<int dim, int spacedim>
void	fill_and_communicate_copy_indices (const DoFHandler< dim, spacedim > &dof_handler)

Protected Attributes
std::vector< types::global_dof_index >	sizes

std::vector< std::vector< std::pair< types::global_dof_index, types::global_dof_index > > >	copy_indices

std::vector< std::vector< std::pair< types::global_dof_index, types::global_dof_index > > >	copy_indices_global_mine

std::vector< std::vector< std::pair< types::global_dof_index, types::global_dof_index > > >	copy_indices_level_mine

bool	perform_plain_copy

std::vector< unsigned int >	component_to_block_map

SmartPointer< const MGConstrainedDoFs, MGLevelGlobalTransfer< VectorType > >	mg_constrained_dofs

Private Member Functions
template<int dim, int spacedim>
void	assert_built (const DoFHandler< dim, spacedim > &dof_handler) const

Private Attributes
std::vector< std::shared_ptr< typename internal::MatrixSelector< VectorType >::Sparsity > >	prolongation_sparsities

std::vector< std::shared_ptr< typename internal::MatrixSelector< VectorType >::Matrix > >	prolongation_matrices

std::vector< std::vector< bool > >	interface_dofs

Subscriptor functionality
Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class.
std::atomic< unsigned int >	counter

std::map< std::string, unsigned int >	counter_map

std::vector< std::atomic< bool > * >	validity_pointers

const std::type_info *	object_info

void	subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

void	unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

unsigned int	n_subscriptions () const

template<typename StreamType >
void	list_subscribers (StreamType &stream) const

void	list_subscribers () const

template<class Archive >
void	serialize (Archive &ar, const unsigned int version)

static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)

static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

void	check_no_subscribers () const noexcept

using	map_value_type = decltype(counter_map)::value_type

using	map_iterator = decltype(counter_map)::iterator

static std::mutex	mutex

Detailed Description

template<typename VectorType>
class MGTransferPrebuilt< VectorType >

Implementation of the MGTransferBase interface for which the transfer operations are prebuilt upon construction of the object of this class as matrices. This is the fast way, since it only needs to build the operation once by looping over all cells and storing the result in a matrix for each level, but requires additional memory.

See MGTransferBase to find out which of the transfer classes is best for your needs.

Definition at line 636 of file mg_transfer.h.

Constructor & Destructor Documentation

◆ MGTransferPrebuilt() [1/2]

template<typename VectorType >

MGTransferPrebuilt< VectorType >::MGTransferPrebuilt ( )

default

Constructor without constraint matrices. Use this constructor only with discontinuous finite elements or with no local refinement.

◆ MGTransferPrebuilt() [2/2]

template<typename VectorType >

MGTransferPrebuilt< VectorType >::MGTransferPrebuilt ( const MGConstrainedDoFs & mg_constrained_dofs )

Constructor with constraints. Equivalent to the default constructor followed by initialize_constraints().

Definition at line 49 of file mg_transfer_prebuilt.cc.

◆ ~MGTransferPrebuilt()

template<typename VectorType >

virtual MGTransferPrebuilt< VectorType >::~MGTransferPrebuilt ( )

overridevirtualdefault

Destructor.

Member Function Documentation

◆ initialize_constraints()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::initialize_constraints ( const MGConstrainedDoFs & mg_constrained_dofs )

Initialize the constraints to be used in build().

Definition at line 59 of file mg_transfer_prebuilt.cc.

◆ clear()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::clear

Reset the object to the state it had right after the default constructor.

Definition at line 69 of file mg_transfer_prebuilt.cc.

◆ build()

template<typename VectorType >

template<int dim, int spacedim>

void MGTransferPrebuilt< VectorType >::build ( const DoFHandler< dim, spacedim > & dof_handler )

Actually build the information required for the transfer operations. Needs to be called before prolongate() or restrict_and_add() can be used.

Definition at line 152 of file mg_transfer_prebuilt.cc.

◆ build_matrices()

template<typename VectorType >

template<int dim, int spacedim>

void MGTransferPrebuilt< VectorType >::build_matrices ( const DoFHandler< dim, spacedim > & dof_handler )

Actually build the prolongation matrices for each level.

Deprecated:: use build() instead.

Definition at line 351 of file mg_transfer_prebuilt.cc.

◆ prolongate()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::prolongate	(	const unsigned int	to_level,
		VectorType &	dst,
		const VectorType &	src
	)		const

overridevirtual

Prolongate a vector from level to_level-1 to level to_level using the embedding matrices of the underlying finite element. The previous content of dst is overwritten.

src is a vector with as many elements as there are degrees of freedom on the coarser level involved.

dst has as many elements as there are degrees of freedom on the finer level.

Implements MGTransferBase< VectorType >.

Definition at line 81 of file mg_transfer_prebuilt.cc.

◆ restrict_and_add()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::restrict_and_add	(	const unsigned int	from_level,
		VectorType &	dst,
		const VectorType &	src
	)		const

overridevirtual

Restrict a vector from level from_level to level from_level-1 using the transpose operation of the prolongate method. If the region covered by cells on level from_level is smaller than that of level from_level-1 (local refinement), then some degrees of freedom in dst are active and will not be altered. For the other degrees of freedom, the result of the restriction is added.

src is a vector with as many elements as there are degrees of freedom on the finer level involved.

dst has as many elements as there are degrees of freedom on the coarser level.

Implements MGTransferBase< VectorType >.

Definition at line 108 of file mg_transfer_prebuilt.cc.

◆ memory_consumption()

template<typename VectorType >

std::size_t MGTransferPrebuilt< VectorType >::memory_consumption

Memory used by this object.

Definition at line 375 of file mg_transfer_prebuilt.cc.

◆ print_matrices()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::print_matrices ( std::ostream & os ) const

Print all the matrices for debugging purposes.

Definition at line 361 of file mg_transfer_prebuilt.cc.

◆ copy_to_mg()

template<typename VectorType >

template<int dim, class InVector , int spacedim>

void MGLevelGlobalTransfer< VectorType >::copy_to_mg	(	const DoFHandler< dim, spacedim > &	dof_handler,
		MGLevelObject< VectorType > &	dst,
		const InVector &	src
	)		const

inherited

Transfer from a vector on the global grid to vectors defined on each of the levels separately for the active degrees of freedom. In particular, for a globally refined mesh only the finest level in dst is filled as a plain copy of src. All the other level objects are left untouched.

◆ copy_from_mg()

template<typename VectorType >

template<int dim, class OutVector , int spacedim>

void MGLevelGlobalTransfer< VectorType >::copy_from_mg	(	const DoFHandler< dim, spacedim > &	dof_handler,
		OutVector &	dst,
		const MGLevelObject< VectorType > &	src
	)		const

inherited

Transfer from multi-level vector to normal vector.

Copies data from active portions of an MGVector into the respective positions of a Vector<number>. In order to keep the result consistent, constrained degrees of freedom are set to zero.

◆ copy_from_mg_add()

template<typename VectorType >

template<int dim, class OutVector , int spacedim>

void MGLevelGlobalTransfer< VectorType >::copy_from_mg_add	(	const DoFHandler< dim, spacedim > &	dof_handler,
		OutVector &	dst,
		const MGLevelObject< VectorType > &	src
	)		const

inherited

Add a multi-level vector to a normal vector.

Works as the previous function, but probably not for continuous elements.

◆ set_component_to_block_map()

template<typename VectorType >

void MGLevelGlobalTransfer< VectorType >::set_component_to_block_map ( const std::vector< unsigned int > & map )

inherited

If this object operates on BlockVector objects, we need to describe how the individual vector components are mapped to the blocks of a vector. For example, for a Stokes system, we have dim+1 vector components for velocity and pressure, but we may want to use block vectors with only two blocks for all velocities in one block, and the pressure variables in the other.

By default, if this function is not called, block vectors have as many blocks as the finite element has vector components. However, this can be changed by calling this function with an array that describes how vector components are to be grouped into blocks. The meaning of the argument is the same as the one given to the DoFTools::count_dofs_per_component function.

◆ print_indices()

template<typename VectorType >

void MGLevelGlobalTransfer< VectorType >::print_indices ( std::ostream & os ) const

inherited

Print the copy index fields for debugging purposes.

Definition at line 114 of file mg_level_global_transfer.cc.

◆ fill_and_communicate_copy_indices()

template<typename VectorType >

template<int dim, int spacedim>

void MGLevelGlobalTransfer< VectorType >::fill_and_communicate_copy_indices ( const DoFHandler< dim, spacedim > & dof_handler )

protectedinherited

Internal function to fill copy_indices*. Called by derived classes.

Definition at line 51 of file mg_level_global_transfer.cc.

◆ assert_built()

template<typename VectorType >

template<int dim, int spacedim>

void MGLevelGlobalTransfer< VectorType >::assert_built ( const DoFHandler< dim, spacedim > & dof_handler ) const

privateinherited

This function is called to make sure that build() has been invoked.

◆ prolongate_and_add()

template<typename VectorType >

void MGTransferBase< VectorType >::prolongate_and_add	(	const unsigned int	to_level,
		VectorType &	dst,
		const VectorType &	src
	)		const

virtualinherited

Prolongate a vector from level to_level-1 to level to_level, summing into the previous content of dst.

src is a vector with as many elements as there are degrees of freedom on the coarser level involved.

dst has as many elements as there are degrees of freedom on the finer level.

Definition at line 47 of file mg_base.cc.

Member Data Documentation

◆ prolongation_sparsities

template<typename VectorType >

std::vector< std::shared_ptr<typename internal::MatrixSelector<VectorType>::Sparsity> > MGTransferPrebuilt< VectorType >::prolongation_sparsities

private

Sparsity patterns for transfer matrices.

Definition at line 749 of file mg_transfer.h.

◆ prolongation_matrices

template<typename VectorType >

std::vector< std::shared_ptr<typename internal::MatrixSelector<VectorType>::Matrix> > MGTransferPrebuilt< VectorType >::prolongation_matrices

private

The actual prolongation matrix. column indices belong to the dof indices of the mother cell, i.e. the coarse level. while row indices belong to the child cell, i.e. the fine level.

Definition at line 758 of file mg_transfer.h.

◆ interface_dofs

template<typename VectorType >

std::vector<std::vector<bool> > MGTransferPrebuilt< VectorType >::interface_dofs

private

Degrees of freedom on the refinement edge excluding those on the boundary.

Definition at line 764 of file mg_transfer.h.

◆ sizes

template<typename VectorType >

std::vector<types::global_dof_index> MGLevelGlobalTransfer< VectorType >::sizes

protectedinherited

Sizes of the multi-level vectors.

Definition at line 337 of file mg_transfer.h.

◆ copy_indices

template<typename VectorType >

std::vector< std::vector<std::pair<types::global_dof_index, types::global_dof_index> > > MGLevelGlobalTransfer< VectorType >::copy_indices

protectedinherited

Mapping for the copy_to_mg() and copy_from_mg() functions. Here only index pairs locally owned

The data is organized as follows: one vector per level. Each element of these vectors contains first the global index, then the level index.

Definition at line 348 of file mg_transfer.h.

◆ copy_indices_global_mine

template<typename VectorType >

std::vector< std::vector<std::pair<types::global_dof_index, types::global_dof_index> > > MGLevelGlobalTransfer< VectorType >::copy_indices_global_mine

protectedinherited

Additional degrees of freedom for the copy_to_mg() function. These are the ones where the global degree of freedom is locally owned and the level degree of freedom is not.

Organization of the data is like for copy_indices_mine.

Definition at line 359 of file mg_transfer.h.

◆ copy_indices_level_mine

template<typename VectorType >

std::vector< std::vector<std::pair<types::global_dof_index, types::global_dof_index> > > MGLevelGlobalTransfer< VectorType >::copy_indices_level_mine

protectedinherited

Additional degrees of freedom for the copy_from_mg() function. These are the ones where the level degree of freedom is locally owned and the global degree of freedom is not.

Organization of the data is like for copy_indices_mine.

Definition at line 370 of file mg_transfer.h.

◆ perform_plain_copy

template<typename VectorType >

bool MGLevelGlobalTransfer< VectorType >::perform_plain_copy

protectedinherited

This variable stores whether the copy operation from the global to the level vector is actually a plain copy to the finest level. This means that the grid has no adaptive refinement and the numbering on the finest multigrid level is the same as in the global case.

Definition at line 378 of file mg_transfer.h.

◆ component_to_block_map

template<typename VectorType >

std::vector<unsigned int> MGLevelGlobalTransfer< VectorType >::component_to_block_map

protectedinherited

The vector that stores what has been given to the set_component_to_block_map() function.

Definition at line 384 of file mg_transfer.h.

◆ mg_constrained_dofs

template<typename VectorType >

SmartPointer<const MGConstrainedDoFs, MGLevelGlobalTransfer<VectorType> > MGLevelGlobalTransfer< VectorType >::mg_constrained_dofs

protectedinherited

The mg_constrained_dofs of the level systems.

Definition at line 390 of file mg_transfer.h.

The documentation for this class was generated from the following files:

include/deal.II/multigrid/mg_transfer.h
source/multigrid/mg_transfer_prebuilt.cc

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Private Attributes

Subscriptor functionality

Detailed Description

Constructor & Destructor Documentation

◆ MGTransferPrebuilt() [1/2]

◆ MGTransferPrebuilt() [2/2]

◆ ~MGTransferPrebuilt()

Member Function Documentation

◆ initialize_constraints()

◆ clear()

◆ build()

◆ build_matrices()

◆ prolongate()

◆ restrict_and_add()

◆ memory_consumption()

◆ print_matrices()

◆ copy_to_mg()

◆ copy_from_mg()

◆ copy_from_mg_add()

◆ set_component_to_block_map()

◆ print_indices()

◆ fill_and_communicate_copy_indices()

◆ assert_built()

◆ prolongate_and_add()

Member Data Documentation

◆ prolongation_sparsities

◆ prolongation_matrices

◆ interface_dofs

◆ sizes

◆ copy_indices

◆ copy_indices_global_mine

◆ copy_indices_level_mine

◆ perform_plain_copy

◆ component_to_block_map

◆ mg_constrained_dofs