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Reference documentation for deal.II version 9.6.0
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#include <deal.II/lac/relaxation_block.h>
Public Member Functions | |
AdditionalData (const double relaxation=1., const bool invert_diagonal=true, const bool same_diagonal=false, const typename PreconditionBlockBase< InverseNumberType >::Inversion inversion=PreconditionBlockBase< InverseNumberType >::gauss_jordan, const double threshold=0., VectorType *temp_ghost_vector=nullptr) | |
std::size_t | memory_consumption () 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) |
Public Attributes | |
SparsityPattern | block_list |
double | relaxation |
bool | invert_diagonal |
bool | same_diagonal |
PreconditionBlockBase< InverseNumberType >::Inversion | inversion |
double | threshold = 0. |
unsigned int | kernel_size = 0 |
std::vector< std::vector< unsigned int > > | order |
VectorType * | temp_ghost_vector |
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::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 |
Parameters for block relaxation methods. In addition to typical control parameters like relaxation, this object also contains the block structure in block_list and an optional ordering of the blocks in order.
Definition at line 80 of file relaxation_block.h.
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privateinherited |
The data type used in counter_map.
Definition at line 229 of file subscriptor.h.
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privateinherited |
The iterator type used in counter_map.
Definition at line 234 of file subscriptor.h.
RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::AdditionalData | ( | const double | relaxation = 1., |
const bool | invert_diagonal = true, | ||
const bool | same_diagonal = false, | ||
const typename PreconditionBlockBase< InverseNumberType >::Inversion | inversion = PreconditionBlockBase< InverseNumberType >::gauss_jordan, | ||
const double | threshold = 0., | ||
VectorType * | temp_ghost_vector = nullptr ) |
Constructor.
std::size_t RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::memory_consumption | ( | ) | const |
Return the memory allocated in this object.
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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.
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inherited |
Unsubscribes a user from the object.
identifier
and the validity
pointer must be the same as the one supplied to subscribe(). Definition at line 155 of file subscriptor.cc.
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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.
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inlineinherited |
List the subscribers to the input stream
.
Definition at line 317 of file subscriptor.h.
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inherited |
List the subscribers to deallog
.
Definition at line 203 of file subscriptor.cc.
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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.
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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.
Definition at line 52 of file subscriptor.cc.
SparsityPattern RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::block_list |
The mapping from indices to blocks. Each row of this pattern enumerates the indices constituting a diagonal block to be inverted.
Definition at line 99 of file relaxation_block.h.
double RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::relaxation |
Relaxation parameter.
Definition at line 104 of file relaxation_block.h.
bool RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::invert_diagonal |
Invert diagonal during initialization. Alternatively, diagonal blocks are inverted on the fly, whenever they are used. While inverting blocks in advance requires more memory, it usually saves a lot of computation. See same_diagonal on how you can avoid memory overhead.
Definition at line 112 of file relaxation_block.h.
bool RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::same_diagonal |
Assume all diagonal blocks are equal to save memory. If this flag is true, then only the first diagonal block of the matrix is inverted and stored. It is then used for all other blocks.
Definition at line 122 of file relaxation_block.h.
PreconditionBlockBase<InverseNumberType>::Inversion RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::inversion |
Choose the inversion method for the blocks.
Definition at line 127 of file relaxation_block.h.
double RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::threshold = 0. |
If inversion is SVD, we can compute the Penrose-Moore inverse of the blocks. In order to do so, we can specify here the threshold below which a singular value will be considered zero and thus not inverted. Setting this parameter to a value greater than zero takes precedence over threshold, i.e. kernel_size must be zero if you want to use threshold. This parameter is used in the call to LAPACKFullMatrix::compute_inverse_svd().
Definition at line 138 of file relaxation_block.h.
unsigned int RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::kernel_size = 0 |
If inversion is SVD, we can compute the Penrose-Moore inverse of the blocks. In order to do so, we can specify here the size of the kernel that will not be inverted but considered zero. Setting this parameter to a value greater than zero takes precedence over threshold, i.e. kernel_size must be zero if you want to use threshold. This parameter is used in the call to LAPACKFullMatrix::compute_inverse_svd().
Definition at line 149 of file relaxation_block.h.
std::vector<std::vector<unsigned int> > RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData::order |
The order in which blocks should be traversed. This vector can initiate several modes of execution:
If the length of the vector is zero, then the relaxation method will be executed from first to last block.
If the length is one, then the inner vector must have the same size as the number of blocks. The relaxation method is applied in the order given in this vector.
If the outer vector has length greater one, then the relaxation method is applied several times, each time in the order given by the inner vector of the corresponding index. This mode can for instance be used for ADI methods and similar direction sweeps.
Definition at line 171 of file relaxation_block.h.
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mutable |
Temporary ghost vector that is used in the relaxation method when performing parallel MPI computations. The user is required to have this point to an initialized vector that contains all indices that appear in the block_list
sa ghost values. Typically, this the set of locally active level DoFs. Unused when VectorType is a serial vector type like Vector<double>.
Definition at line 181 of file relaxation_block.h.
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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.
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mutableprivateinherited |
In this map, we count subscriptions for each different identification string supplied to subscribe().
Definition at line 224 of file subscriptor.h.
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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.
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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.
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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.