MGTransferBlockMatrixFree< dim, Number > Class Template Reference

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

Inheritance diagram for MGTransferBlockMatrixFree< dim, Number >:

Public Member Functions
	MGTransferBlockMatrixFree ()=default
	MGTransferBlockMatrixFree (const MGConstrainedDoFs &mg_constrained_dofs)
	MGTransferBlockMatrixFree (const std::vector< MGConstrainedDoFs > &mg_constrained_dofs)
virtual	~MGTransferBlockMatrixFree () override=default
void	initialize_constraints (const MGConstrainedDoFs &mg_constrained_dofs)
void	initialize_constraints (const std::vector< MGConstrainedDoFs > &mg_constrained_dofs)
void	clear ()
void	build (const DoFHandler< dim, dim > &dof_handler)
void	build (const std::vector< const DoFHandler< dim, dim > * > &dof_handler)
virtual void	prolongate (const unsigned int to_level, LinearAlgebra::distributed::BlockVector< Number > &dst, const LinearAlgebra::distributed::BlockVector< Number > &src) const override
virtual void	restrict_and_add (const unsigned int from_level, LinearAlgebra::distributed::BlockVector< Number > &dst, const LinearAlgebra::distributed::BlockVector< Number > &src) const override
template<typename Number2 , int spacedim>
void	copy_to_mg (const DoFHandler< dim, spacedim > &dof_handler, MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &dst, const LinearAlgebra::distributed::BlockVector< Number2 > &src) const
template<typename Number2 , int spacedim>
void	copy_to_mg (const std::vector< const DoFHandler< dim, spacedim > * > &dof_handler, MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &dst, const LinearAlgebra::distributed::BlockVector< Number2 > &src) const
template<typename Number2 , int spacedim>
void	copy_from_mg (const DoFHandler< dim, spacedim > &dof_handler, LinearAlgebra::distributed::BlockVector< Number2 > &dst, const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &src) const
template<typename Number2 , int spacedim>
void	copy_from_mg (const std::vector< const DoFHandler< dim, spacedim > * > &dof_handler, LinearAlgebra::distributed::BlockVector< Number2 > &dst, const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &src) const
std::size_t	memory_consumption () const
Public Member Functions inherited from MGTransferBase< LinearAlgebra::distributed::BlockVector< Number > >
virtual	~MGTransferBase () override=default
Public Member Functions inherited from Subscriptor
	Subscriptor ()
	Subscriptor (const Subscriptor &)
	Subscriptor (Subscriptor &&) noexcept
virtual	~Subscriptor ()
Subscriptor &	operator= (const Subscriptor &)
Subscriptor &	operator= (Subscriptor &&) noexcept
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 Public Attributes
static const bool	supports_dof_handler_vector = true

Private Attributes
std::vector< MGTransferMatrixFree< dim, Number > >	matrix_free_transfer_vector
const bool	same_for_all

Additional Inherited Members
Static Public Member Functions inherited from Subscriptor
static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)
static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

Detailed Description

template<int dim, typename Number>
class MGTransferBlockMatrixFree< dim, Number >

Implementation of the MGTransferBase interface for which the transfer operations is implemented in a matrix-free way based on the interpolation matrices of the underlying finite element. This requires considerably less memory than MGTransferPrebuilt and can also be considerably faster than that variant.

This class works with LinearAlgebra::distributed::BlockVector and performs exactly the same transfer operations for each block as MGTransferMatrixFree. Both the cases that the same DoFHandler is used for all the blocks and that each block uses its own DoFHandler are supported.

Author

Denis Davydov, Daniel Arndt

Date

2017

Definition at line 313 of file mg_transfer_matrix_free.h.

Constructor & Destructor Documentation

MGTransferBlockMatrixFree() [1/3]

template<int dim, typename Number >

MGTransferBlockMatrixFree< dim, Number >::MGTransferBlockMatrixFree ( )

default

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

MGTransferBlockMatrixFree() [2/3]

template<int dim, typename Number >

MGTransferBlockMatrixFree< dim, Number >::MGTransferBlockMatrixFree

(

const MGConstrainedDoFs &

mg_constrained_dofs

)

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

Definition at line 656 of file mg_transfer_matrix_free.cc.

MGTransferBlockMatrixFree() [3/3]

template<int dim, typename Number >

MGTransferBlockMatrixFree< dim, Number >::MGTransferBlockMatrixFree

(

const std::vector< MGConstrainedDoFs > &

mg_constrained_dofs

)

Same as above for the case that each block has its own DoFHandler.

Definition at line 666 of file mg_transfer_matrix_free.cc.

~MGTransferBlockMatrixFree()

template<int dim, typename Number >

virtual MGTransferBlockMatrixFree< dim, Number >::~MGTransferBlockMatrixFree ( )

overridevirtualdefault

Destructor.

Member Function Documentation

initialize_constraints() [1/2]

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::initialize_constraints

(

const MGConstrainedDoFs &

mg_constrained_dofs

)

Initialize the constraints to be used in build().

Definition at line 678 of file mg_transfer_matrix_free.cc.

initialize_constraints() [2/2]

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::initialize_constraints

(

const std::vector< MGConstrainedDoFs > &

mg_constrained_dofs

)

Same as above for the case that each block has its own DoFHandler.

Definition at line 694 of file mg_transfer_matrix_free.cc.

clear()

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::clear

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

Definition at line 712 of file mg_transfer_matrix_free.cc.

build() [1/2]

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::build

(

const DoFHandler< dim, dim > &

dof_handler

)

Actually build the information for the prolongation for each level.

Definition at line 721 of file mg_transfer_matrix_free.cc.

build() [2/2]

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::build

(

const std::vector< const DoFHandler< dim, dim > * > &

dof_handler

)

Same as above for the case that each block has its own DoFHandler.

Definition at line 732 of file mg_transfer_matrix_free.cc.

prolongate()

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::prolongate ( const unsigned int  to_level, LinearAlgebra::distributed::BlockVector< Number > &  dst, const LinearAlgebra::distributed::BlockVector< Number > &  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.

Parameters

to_level	The index of the level to prolongate to, which is the level 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.

Implements MGTransferBase< LinearAlgebra::distributed::BlockVector< Number > >.

Definition at line 744 of file mg_transfer_matrix_free.cc.

restrict_and_add()

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::restrict_and_add ( const unsigned int  from_level, LinearAlgebra::distributed::BlockVector< Number > &  dst, const LinearAlgebra::distributed::BlockVector< Number > &  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.

Parameters

from_level	The index of the level to restrict from, which is the level of src.
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< LinearAlgebra::distributed::BlockVector< Number > >.

Definition at line 768 of file mg_transfer_matrix_free.cc.

copy_to_mg() [1/2]

template<int dim, typename Number >

template<typename Number2 , int spacedim>

void MGTransferBlockMatrixFree< dim, Number >::copy_to_mg	(	const DoFHandler< dim, spacedim > &	dof_handler,
		MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &	dst,
		const LinearAlgebra::distributed::BlockVector< Number2 > &	src
	)		const

Transfer from a block-vector on the global grid to block-vectors defined on each of the levels separately for 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.

This function will initialize dst accordingly if needed as required by the Multigrid class.

copy_to_mg() [2/2]

template<int dim, typename Number >

template<typename Number2 , int spacedim>

void MGTransferBlockMatrixFree< dim, Number >::copy_to_mg	(	const std::vector< const DoFHandler< dim, spacedim > * > &	dof_handler,
		MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &	dst,
		const LinearAlgebra::distributed::BlockVector< Number2 > &	src
	)		const

Same as above for the case that each block has its own DoFHandler.

copy_from_mg() [1/2]

template<int dim, typename Number >

template<typename Number2 , int spacedim>

void MGTransferBlockMatrixFree< dim, Number >::copy_from_mg	(	const DoFHandler< dim, spacedim > &	dof_handler,
		LinearAlgebra::distributed::BlockVector< Number2 > &	dst,
		const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &	src
	)		const

Transfer from multi-level block-vector to normal vector.

copy_from_mg() [2/2]

template<int dim, typename Number >

template<typename Number2 , int spacedim>

void MGTransferBlockMatrixFree< dim, Number >::copy_from_mg	(	const std::vector< const DoFHandler< dim, spacedim > * > &	dof_handler,
		LinearAlgebra::distributed::BlockVector< Number2 > &	dst,
		const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number >> &	src
	)		const

Same as above for the case that each block has its own DoFHandler.

memory_consumption()

template<int dim, typename Number >

std::size_t MGTransferBlockMatrixFree< dim, Number >::memory_consumption

Memory used by this object.

Definition at line 792 of file mg_transfer_matrix_free.cc.

Member Data Documentation

supports_dof_handler_vector

template<int dim, typename Number >

const bool MGTransferBlockMatrixFree< dim, Number >::supports_dof_handler_vector = true

static

This class can both be used with a single DoFHandler or a separate DoFHandler for each block.

Definition at line 474 of file mg_transfer_matrix_free.h.

matrix_free_transfer_vector

template<int dim, typename Number >

std::vector<MGTransferMatrixFree<dim, Number> > MGTransferBlockMatrixFree< dim, Number >::matrix_free_transfer_vector

private

Non-block matrix-free versions of transfer operation.

Definition at line 480 of file mg_transfer_matrix_free.h.

same_for_all

template<int dim, typename Number >

const bool MGTransferBlockMatrixFree< dim, Number >::same_for_all

private

A flag to indicate whether the same DoFHandler is used for all the components or if each block has its own DoFHandler.

Definition at line 486 of file mg_transfer_matrix_free.h.

---

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

• include/deal.II/multigrid/mg_transfer_matrix_free.h
• source/multigrid/mg_transfer_matrix_free.cc