#include <deal.II/lac/solver_control.h>

Inheritance diagram for ConsecutiveControl:

[legend]

Public Types
enum	State { iterate = 0 , success , failure }

Public Member Functions
	ConsecutiveControl (const unsigned int maxiter=100, const double tolerance=1.e-10, const unsigned int n_consecutive_iterations=2, const bool log_history=false, const bool log_result=false)

	ConsecutiveControl (const SolverControl &c)

ConsecutiveControl &	operator= (const SolverControl &c)

virtual	~ConsecutiveControl () override=default

virtual State	check (const unsigned int step, const double check_value) override

void	parse_parameters (ParameterHandler &param)

State	last_check () const

double	initial_value () const

double	last_value () const

unsigned int	last_step () const

unsigned int	max_steps () const

unsigned int	set_max_steps (const unsigned int)

void	set_failure_criterion (const double rel_failure_residual)

void	clear_failure_criterion ()

double	tolerance () const

double	set_tolerance (const double)

void	enable_history_data ()

const std::vector< double > &	get_history_data () const

double	average_reduction () const

double	final_reduction () const

double	step_reduction (unsigned int step) const

void	log_history (const bool)

bool	log_history () const

unsigned int	log_frequency (unsigned int)

void	log_result (const bool)

bool	log_result () const

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

EnableObserverPointer functionality
Classes derived from EnableObserverPointer provide a facility to subscribe to this object. This is mostly used by the ObserverPointer 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 void	declare_parameters (ParameterHandler &param)

static ::ExceptionBase &	ExcHistoryDataRequired ()

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

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

Protected Attributes
unsigned int	n_consecutive_iterations

unsigned int	n_converged_iterations

unsigned int	maxsteps

double	tol

State	lcheck

double	initial_val

double	lvalue

unsigned int	lstep

bool	check_failure

double	relative_failure_residual

double	failure_residual

bool	m_log_history

unsigned int	m_log_frequency

bool	m_log_result

bool	history_data_enabled

std::vector< double >	history_data

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

Detailed Description

Specialization of SolverControl which returns SolverControl::State::success if and only if a certain positive number of consecutive iterations satisfy the specified tolerance. This is useful in cases when solving nonlinear problems using inexact Hessian.

For example: The requested number of consecutively converged iterations is 2, the tolerance is 0.2. The ConsecutiveControl will return SolverControl::State::success only at the last step in the sequence 0.5, 0.0005, 1.0, 0.05, 0.01.

Definition at line 564 of file solver_control.h.

Member Typedef Documentation

◆ map_value_type

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

privateinherited

The data type used in counter_map.

Definition at line 238 of file enable_observer_pointer.h.

◆ map_iterator

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

privateinherited

The iterator type used in counter_map.

Definition at line 243 of file enable_observer_pointer.h.

Member Enumeration Documentation

◆ State

enum SolverControl::State

inherited

Enum denoting the different states a solver can be in. See the general documentation of this class for more information.

Enumerator
iterate	Continue iteration.
success	Stop iteration, goal reached.
failure	Stop iteration, goal not reached.

Definition at line 73 of file solver_control.h.

Constructor & Destructor Documentation

◆ ConsecutiveControl() [1/2]

ConsecutiveControl::ConsecutiveControl	(	const unsigned int	maxiter = `100`,
		const double	tolerance = `1.e-10`,
		const unsigned int	n_consecutive_iterations = `2`,
		const bool	log_history = `false`,
		const bool	log_result = `false`
	)

explicit

Constructor. n_consecutive_iterations is the number of consecutive iterations which should satisfy the prescribed tolerance for convergence. Other arguments have the same meaning as those of the constructor of the SolverControl.

Definition at line 349 of file solver_control.cc.

◆ ConsecutiveControl() [2/2]

ConsecutiveControl::ConsecutiveControl ( const SolverControl & c )

explicit

Initialize with a SolverControl object. The result will emulate SolverControl by setting n_consecutive_iterations to one.

Definition at line 365 of file solver_control.cc.

◆ ~ConsecutiveControl()

virtual ConsecutiveControl::~ConsecutiveControl ( )

overridevirtualdefault

Virtual destructor is needed as there are virtual functions in this class.

Member Function Documentation

◆ operator=()

ConsecutiveControl & ConsecutiveControl::operator= ( const SolverControl & c )

Assign a SolverControl object to ConsecutiveControl. The result of the assignment will emulate SolverControl by setting n_consecutive_iterations to one.

Definition at line 374 of file solver_control.cc.

◆ check()

SolverControl::State ConsecutiveControl::check	(	const unsigned int	step,
		const double	check_value
	)

overridevirtual

Decide about success or failure of an iteration, see the class description above.

Reimplemented from SolverControl.

Definition at line 385 of file solver_control.cc.

◆ declare_parameters()

void SolverControl::declare_parameters ( ParameterHandler & param )

staticinherited

Interface to parameter file.

Definition at line 206 of file solver_control.cc.

◆ parse_parameters()

void SolverControl::parse_parameters ( ParameterHandler & param )

inherited

Read parameters from file.

Definition at line 217 of file solver_control.cc.

◆ last_check()

SolverControl::State SolverControl::last_check ( ) const

inherited

Return the result of the last check operation.

Definition at line 108 of file solver_control.cc.

◆ initial_value()

double SolverControl::initial_value ( ) const

inherited

Return the initial convergence criterion.

Definition at line 115 of file solver_control.cc.

◆ last_value()

double SolverControl::last_value ( ) const

inherited

Return the convergence value of last iteration step for which check was called by the solver.

Definition at line 122 of file solver_control.cc.

◆ last_step()

unsigned int SolverControl::last_step ( ) const

inherited

Number of last iteration step.

Definition at line 129 of file solver_control.cc.

◆ max_steps()

unsigned int SolverControl::max_steps ( ) const

inherited

Maximum number of steps.

◆ set_max_steps()

unsigned int SolverControl::set_max_steps ( const unsigned int )

inherited

Change maximum number of steps.

◆ set_failure_criterion()

void SolverControl::set_failure_criterion ( const double rel_failure_residual )

inherited

Enables the failure check. Solving is stopped with ReturnState failure if residual>failure_residual with failure_residual := rel_failure_residual*first_residual.

◆ clear_failure_criterion()

void SolverControl::clear_failure_criterion ( )

inherited

Disables failure check and resets relative_failure_residual and failure_residual to zero.

◆ tolerance()

double SolverControl::tolerance ( ) const

inherited

Tolerance.

◆ set_tolerance()

double SolverControl::set_tolerance ( const double )

inherited

Change tolerance.

◆ enable_history_data()

void SolverControl::enable_history_data ( )

inherited

Enables writing residuals of each step into a vector for later analysis.

Definition at line 147 of file solver_control.cc.

◆ get_history_data()

const std::vector< double > & SolverControl::get_history_data ( ) const

inherited

Provide read access to the collected residual data.

Definition at line 155 of file solver_control.cc.

◆ average_reduction()

double SolverControl::average_reduction ( ) const

inherited

Average error reduction over all steps.

Requires enable_history_data()

Definition at line 171 of file solver_control.cc.

◆ final_reduction()

double SolverControl::final_reduction ( ) const

inherited

Error reduction of the last step; for stationary iterations, this approximates the norm of the iteration matrix.

Requires enable_history_data()

Definition at line 199 of file solver_control.cc.

◆ step_reduction()

double SolverControl::step_reduction ( unsigned int step ) const

inherited

Error reduction of any iteration step.

Requires enable_history_data()

Definition at line 187 of file solver_control.cc.

◆ log_history() [1/2]

void SolverControl::log_history ( const bool )

inherited

Log each iteration step. Use log_frequency for skipping steps.

◆ log_history() [2/2]

bool SolverControl::log_history ( ) const

inherited

Return the log_history flag.

◆ log_frequency()

unsigned int SolverControl::log_frequency ( unsigned int f )

inherited

Set logging frequency.

Definition at line 136 of file solver_control.cc.

◆ log_result() [1/2]

void SolverControl::log_result ( const bool )

inherited

Log start and end step.

◆ log_result() [2/2]

bool SolverControl::log_result ( ) const

inherited

Return the log_result flag.

◆ subscribe()

void EnableObserverPointer::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 131 of file enable_observer_pointer.cc.

◆ unsubscribe()

void EnableObserverPointer::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 151 of file enable_observer_pointer.cc.

◆ n_subscriptions()

unsigned int EnableObserverPointer::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 322 of file enable_observer_pointer.h.

◆ list_subscribers() [1/2]

template<typename StreamType >

void EnableObserverPointer::list_subscribers ( StreamType & stream ) const

inlineinherited

List the subscribers to the input stream.

Definition at line 339 of file enable_observer_pointer.h.

◆ list_subscribers() [2/2]

void EnableObserverPointer::list_subscribers ( ) const

inherited

List the subscribers to deallog.

Definition at line 199 of file enable_observer_pointer.cc.

◆ serialize()

template<class Archive >

void EnableObserverPointer::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 331 of file enable_observer_pointer.h.

◆ check_no_subscribers()

void EnableObserverPointer::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 53 of file enable_observer_pointer.cc.

Member Data Documentation

◆ n_consecutive_iterations

unsigned int ConsecutiveControl::n_consecutive_iterations

protected

The number of consecutive iterations which should satisfy the prescribed tolerance for convergence.

Definition at line 611 of file solver_control.h.

◆ n_converged_iterations

unsigned int ConsecutiveControl::n_converged_iterations

protected

Counter for the number of consecutively converged iterations.

Definition at line 616 of file solver_control.h.

◆ maxsteps

unsigned int SolverControl::maxsteps

protectedinherited

Maximum number of steps.

Definition at line 334 of file solver_control.h.

◆ tol

double SolverControl::tol

protectedinherited

Prescribed tolerance to be achieved.

Definition at line 339 of file solver_control.h.

◆ lcheck

State SolverControl::lcheck

protectedinherited

Result of last check operation.

Definition at line 344 of file solver_control.h.

◆ initial_val

double SolverControl::initial_val

protectedinherited

Initial value.

Definition at line 349 of file solver_control.h.

◆ lvalue

double SolverControl::lvalue

protectedinherited

Last value of the convergence criterion.

Definition at line 354 of file solver_control.h.

◆ lstep

unsigned int SolverControl::lstep

protectedinherited

Last step.

Definition at line 359 of file solver_control.h.

◆ check_failure

bool SolverControl::check_failure

protectedinherited

Is set to true by set_failure_criterion and enables failure checking.

Definition at line 365 of file solver_control.h.

◆ relative_failure_residual

double SolverControl::relative_failure_residual

protectedinherited

Stores the rel_failure_residual set by set_failure_criterion

Definition at line 370 of file solver_control.h.

◆ failure_residual

double SolverControl::failure_residual

protectedinherited

failure_residual equals the first residual multiplied by relative_crit set by set_failure_criterion (see there).

Until the first residual is known it is 0.

Definition at line 378 of file solver_control.h.

◆ m_log_history

bool SolverControl::m_log_history

protectedinherited

Log convergence history to deallog.

Definition at line 383 of file solver_control.h.

◆ m_log_frequency

unsigned int SolverControl::m_log_frequency

protectedinherited

Log only every nth step.

Definition at line 388 of file solver_control.h.

◆ m_log_result

bool SolverControl::m_log_result

protectedinherited

Log iteration result to deallog. If true, after finishing the iteration, a statement about failure or success together with lstep and lvalue are logged.

Definition at line 395 of file solver_control.h.

◆ history_data_enabled

bool SolverControl::history_data_enabled

protectedinherited

Control over the storage of history data. Set by enable_history_data().

Definition at line 400 of file solver_control.h.

◆ history_data

std::vector<double> SolverControl::history_data

protectedinherited

Vector storing the result after each iteration step for later statistical analysis.

Use of this vector is enabled by enable_history_data().

Definition at line 408 of file solver_control.h.

◆ counter

std::atomic<unsigned int> EnableObserverPointer::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 227 of file enable_observer_pointer.h.

◆ counter_map

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

mutableprivateinherited

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

Definition at line 233 of file enable_observer_pointer.h.

◆ validity_pointers

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

mutableprivateinherited

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

Definition at line 249 of file enable_observer_pointer.h.

◆ object_info

const std::type_info* EnableObserverPointer::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 257 of file enable_observer_pointer.h.

◆ mutex

std::mutex EnableObserverPointer::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 280 of file enable_observer_pointer.h.

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

include/deal.II/lac/solver_control.h
source/lac/solver_control.cc

Public Types

Public Member Functions

Static Public Member Functions

Protected Attributes

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Member Typedef Documentation

◆ map_value_type

◆ map_iterator

Member Enumeration Documentation

◆ State

Constructor & Destructor Documentation

◆ ConsecutiveControl() [1/2]

◆ ConsecutiveControl() [2/2]

◆ ~ConsecutiveControl()

Member Function Documentation

◆ operator=()

◆ check()

◆ declare_parameters()

◆ parse_parameters()

◆ last_check()

◆ initial_value()

◆ last_value()

◆ last_step()

◆ max_steps()

◆ set_max_steps()

◆ set_failure_criterion()

◆ clear_failure_criterion()

◆ tolerance()

◆ set_tolerance()

◆ enable_history_data()

◆ get_history_data()

◆ average_reduction()

◆ final_reduction()

◆ step_reduction()

◆ log_history() [1/2]

◆ log_history() [2/2]

◆ log_frequency()

◆ log_result() [1/2]

◆ log_result() [2/2]

◆ subscribe()

◆ unsubscribe()

◆ n_subscriptions()

◆ list_subscribers() [1/2]

◆ list_subscribers() [2/2]

◆ serialize()

◆ check_no_subscribers()

Member Data Documentation

◆ n_consecutive_iterations

◆ n_converged_iterations

◆ maxsteps

◆ tol

◆ lcheck

◆ initial_val

◆ lvalue

◆ lstep

◆ check_failure

◆ relative_failure_residual

◆ failure_residual

◆ m_log_history

◆ m_log_frequency

◆ m_log_result

◆ history_data_enabled

◆ history_data

◆ counter

◆ counter_map

◆ validity_pointers

◆ object_info

◆ mutex