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 > &dof_handler)
void	build (const std::vector< const DoFHandler< dim > * > &dof_handler)
std::size_t	memory_consumption () const
virtual void	prolongate (const unsigned int to_level, LinearAlgebra::distributed::BlockVector< Number > &dst, const LinearAlgebra::distributed::BlockVector< Number > &src) const override
virtual void	prolongate_and_add (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
void	copy_to_mg (const DoFHandler< dim > &dof_handler, MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > &dst, const BlockVectorType2 &src) const
void	copy_to_mg (const std::vector< const DoFHandler< dim > * > &dof_handler, MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > &dst, const BlockVectorType2 &src) const
void	copy_from_mg (const DoFHandler< dim > &dof_handler, BlockVectorType2 &dst, const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > &src) const
void	copy_from_mg (const std::vector< const DoFHandler< dim > * > &dof_handler, BlockVectorType2 &dst, const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > &src) const
template<class Archive >
void	serialize (Archive &ar, const unsigned int version)
Subscriptor functionality
Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class.
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

Static Public Member Functions
static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)
static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

Static Public Attributes
static const bool	supports_dof_handler_vector

Protected Member Functions
const MGTransferMatrixFree< dim, Number > &	get_matrix_free_transfer (const unsigned int b) const override

Protected Attributes
const bool	same_for_all

Private Types
using	map_value_type = decltype(counter_map)::value_type
using	map_iterator = decltype(counter_map)::iterator

Private Member Functions
void	check_no_subscribers () const noexcept

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

Static Private Attributes
static std::mutex	mutex

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.

Definition at line 460 of file mg_transfer_matrix_free.h.

Member Typedef Documentation

map_value_type

using Subscriptor::map_value_type = decltype(counter_map)::value_type

privateinherited

The data type used in counter_map.

Definition at line 229 of file subscriptor.h.

map_iterator

using Subscriptor::map_iterator = decltype(counter_map)::iterator

privateinherited

The iterator type used in counter_map.

Definition at line 234 of file subscriptor.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 697 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 709 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 723 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 739 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 802 of file mg_transfer_matrix_free.cc.

build() [1/2]

template<int dim, typename Number >

void MGTransferBlockMatrixFree< dim, Number >::build

(

const DoFHandler< dim > &

dof_handler

)

Actually build the information for the prolongation for each level.

Definition at line 757 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 > * > &

dof_handler

)

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

Definition at line 768 of file mg_transfer_matrix_free.cc.

memory_consumption()

template<int dim, typename Number >

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

(

)

const

Memory used by this object.

Definition at line 780 of file mg_transfer_matrix_free.cc.

get_matrix_free_transfer()

template<int dim, typename Number >

const MGTransferMatrixFree< dim, Number > & MGTransferBlockMatrixFree< dim, Number >::get_matrix_free_transfer ( const unsigned int b ) const

overrideprotectedvirtual

Return the right non-block transfer operator. Has to be implemented by the derived class.

Implements MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >.

Definition at line 792 of file mg_transfer_matrix_free.cc.

prolongate()

virtual void MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::prolongate ( const unsigned int to_level, LinearAlgebra::distributed::BlockVector< Number > & dst, const LinearAlgebra::distributed::BlockVector< Number > & src ) const

overridevirtualinherited

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 > >.

prolongate_and_add()

virtual void MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::prolongate_and_add ( const unsigned int to_level, LinearAlgebra::distributed::BlockVector< Number > & dst, const LinearAlgebra::distributed::BlockVector< Number > & src ) const

overridevirtualinherited

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.

Reimplemented from MGTransferBase< LinearAlgebra::distributed::BlockVector< Number > >.

restrict_and_add()

virtual void MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::restrict_and_add ( const unsigned int from_level, LinearAlgebra::distributed::BlockVector< Number > & dst, const LinearAlgebra::distributed::BlockVector< Number > & src ) const

overridevirtualinherited

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 > >.

copy_to_mg() [1/2]

void MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::copy_to_mg ( const DoFHandler< dim > & dof_handler, MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > & dst, const BlockVectorType2 & src ) const

inherited

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]

void MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::copy_to_mg ( const std::vector< const DoFHandler< dim > * > & dof_handler, MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > & dst, const BlockVectorType2 & src ) const

inherited

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

copy_from_mg() [1/2]

void MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::copy_from_mg ( const DoFHandler< dim > & dof_handler, BlockVectorType2 & dst, const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > & src ) const

inherited

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

copy_from_mg() [2/2]

void MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::copy_from_mg ( const std::vector< const DoFHandler< dim > * > & dof_handler, BlockVectorType2 & dst, const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > & src ) const

inherited

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

subscribe()

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

inherited

Subscribes a user of the object by storing the pointer validity. The subscriber may be identified by text supplied as identifier.

Definition at line 135 of file subscriptor.cc.

unsubscribe()

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

inherited

Unsubscribes a user from the object.

Note

The identifier and the validity pointer must be the same as the one supplied to subscribe().

Definition at line 155 of file subscriptor.cc.

n_subscriptions()

unsigned int Subscriptor::n_subscriptions ( ) const

inlineinherited

Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.

Definition at line 300 of file subscriptor.h.

list_subscribers() [1/2]

template<typename StreamType >

void Subscriptor::list_subscribers ( StreamType & stream ) const

inlineinherited

List the subscribers to the input stream.

Definition at line 317 of file subscriptor.h.

list_subscribers() [2/2]

void Subscriptor::list_subscribers ( ) const

inherited

List the subscribers to deallog.

Definition at line 203 of file subscriptor.cc.

serialize()

template<class Archive >

void Subscriptor::serialize ( Archive & ar, const unsigned int version )

inlineinherited

Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.

This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.

Definition at line 309 of file subscriptor.h.

check_no_subscribers()

void Subscriptor::check_no_subscribers ( ) const

privatenoexceptinherited

Check that there are no objects subscribing to this object. If this check passes then it is safe to destroy the current object. It this check fails then this function will either abort or print an error message to deallog (by using the AssertNothrow mechanism), but will not throw an exception.

Note

Since this function is just a consistency check it does nothing in release mode.

If this function is called when there is an uncaught exception then, rather than aborting, this function prints an error message to the standard error stream and returns.

Definition at line 52 of file subscriptor.cc.

Member Data Documentation

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 534 of file mg_transfer_matrix_free.h.

supports_dof_handler_vector

const bool MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::supports_dof_handler_vector

staticinherited

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

Definition at line 427 of file mg_transfer_matrix_free.h.

same_for_all

const bool MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >::same_for_all

protectedinherited

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 441 of file mg_transfer_matrix_free.h.

counter

std::atomic<unsigned int> Subscriptor::counter

mutableprivateinherited

Store the number of objects which subscribed to this object. Initially, this number is zero, and upon destruction it shall be zero again (i.e. all objects which subscribed should have unsubscribed again).

The creator (and owner) of an object is counted in the map below if HE manages to supply identification.

We use the mutable keyword in order to allow subscription to constant objects also.

This counter may be read from and written to concurrently in multithreaded code: hence we use the std::atomic class template.

Definition at line 218 of file subscriptor.h.

counter_map

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

mutableprivateinherited

In this map, we count subscriptions for each different identification string supplied to subscribe().

Definition at line 224 of file subscriptor.h.

validity_pointers

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

mutableprivateinherited

In this vector, we store pointers to the validity bool in the SmartPointer objects that subscribe to this class.

Definition at line 240 of file subscriptor.h.

object_info

const std::type_info* Subscriptor::object_info

mutableprivateinherited

Pointer to the typeinfo object of this object, from which we can later deduce the class name. Since this information on the derived class is neither available in the destructor, nor in the constructor, we obtain it in between and store it here.

Definition at line 248 of file subscriptor.h.

mutex

std::mutex Subscriptor::mutex

staticprivateinherited

A mutex used to ensure data consistency when accessing the mutable members of this class. This lock is used in the subscribe() and unsubscribe() functions, as well as in list_subscribers().

Definition at line 271 of file subscriptor.h.

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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