Reference documentation for deal.II version 9.4.0
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Public Member Functions | Static Public Attributes | Protected Member Functions | Protected Attributes | Private Attributes | List of all members
MGTransferBlockMatrixFree< dim, Number > Class Template Reference

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

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

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 Attributes

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

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 intcounter
 
std::map< std::string, unsigned intcounter_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)
 
using map_value_type = decltype(counter_map)::value_type
 
using map_iterator = decltype(counter_map)::iterator
 
static std::mutex mutex
 
static ::ExceptionBaseExcInUse (int arg1, std::string arg2, std::string arg3)
 
static ::ExceptionBaseExcNoSubscriber (std::string arg1, std::string arg2)
 
void check_no_subscribers () const noexcept
 

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 464 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 708 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 720 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 734 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 750 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 813 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 768 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 779 of file mg_transfer_matrix_free.cc.

◆ memory_consumption()

template<int dim, typename Number >
std::size_t MGTransferBlockMatrixFree< dim, Number >::memory_consumption

Memory used by this object.

Definition at line 791 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 803 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_levelThe index of the level to prolongate to, which is the level of dst.
srcis a vector with as many elements as there are degrees of freedom on the coarser level involved.
dsthas 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_levelThe index of the level to restrict from, which is the level of src.
srcis a vector with as many elements as there are degrees of freedom on the finer level involved.
dsthas 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, spacedim > &  dof_handler,
MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > &  dst,
const LinearAlgebra::distributed::BlockVector< Number2 > &  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, spacedim > * > &  dof_handler,
MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > &  dst,
const LinearAlgebra::distributed::BlockVector< Number2 > &  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, spacedim > &  dof_handler,
LinearAlgebra::distributed::BlockVector< Number2 > &  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, spacedim > * > &  dof_handler,
LinearAlgebra::distributed::BlockVector< Number2 > &  dst,
const MGLevelObject< LinearAlgebra::distributed::BlockVector< Number > > &  src 
) const
inherited

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

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 538 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 431 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 445 of file mg_transfer_matrix_free.h.


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