//////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// More...

#include <iterative_linear_solver.h>

Inheritance diagram for oomph::GS< CRDoubleMatrix >:

Public Member Functions
	GS ()
	Constructor. More...

virtual	~GS ()
	Destructor (cleanup storage) More...

	GS (const GS &)=delete
	Broken copy constructor. More...

void	operator= (const GS &)=delete
	Broken assignment operator. More...

void	smoother_solve (const DoubleVector &rhs, DoubleVector &result)
	The smoother_solve function performs fixed number of iterations on the system A*result=rhs. The number of (smoothing) iterations is the same as the max. number of iterations in the underlying IterativeLinearSolver class. More...

void	disable_resolve ()
	Overload disable resolve so that it cleans up memory too. More...

void	smoother_setup (DoubleMatrixBase *matrix_pt)
	Set up the smoother for the matrix specified by the pointer. More...

void	setup_helper (DoubleMatrixBase *matrix_pt)
	Generic setup function to sort out everything that needs to be set up with regards to the input matrix. More...

void	solve (Problem *const &problem_pt, DoubleVector &result)
	Solver: Takes pointer to problem and returns the results vector which contains the solution of the linear system defined by the problem's fully assembled Jacobian and residual vector. More...

void	solve (DoubleMatrixBase *const &matrix_pt, const DoubleVector &rhs, DoubleVector &solution)
	Linear-algebra-type solver: Takes pointer to a matrix and rhs vector and returns the solution of the linear system. More...

void	solve (DoubleMatrixBase *const &matrix_pt, const Vector< double > &rhs, Vector< double > &result)
	Linear-algebra-type solver: Takes pointer to a matrix and rhs vector and returns the solution of the linear system Call the broken base-class version. If you want this, please implement it. More...

void	resolve (const DoubleVector &rhs, DoubleVector &result)
	Re-solve the system defined by the last assembled Jacobian and the rhs vector specified here. Solution is returned in the vector result. More...

double	preconditioner_setup_time () const
	Returns the time taken to set up the preconditioner. More...

unsigned	iterations () const
	Number of iterations taken. More...

Public Member Functions inherited from oomph::Smoother
	Smoother ()
	Empty constructor. More...

virtual	~Smoother ()
	Virtual empty destructor. More...

template<typename MATRIX >
void	check_validity_of_solve_helper_inputs (MATRIX *const &matrix_pt, const DoubleVector &rhs, DoubleVector &solution, const double &n_dof)
	Self-test to check that all the dimensions of the inputs to solve helper are consistent and everything that needs to be built, is. More...

Public Member Functions inherited from oomph::IterativeLinearSolver
	IterativeLinearSolver ()
	Constructor: Set (default) trivial preconditioner and set defaults for tolerance and max. number of iterations. More...

	IterativeLinearSolver (const IterativeLinearSolver &)=delete
	Broken copy constructor. More...

void	operator= (const IterativeLinearSolver &)=delete
	Broken assignment operator. More...

virtual	~IterativeLinearSolver ()
	Destructor (empty) More...

Preconditioner *&	preconditioner_pt ()
	Access function to preconditioner. More...

Preconditioner *const &	preconditioner_pt () const
	Access function to preconditioner (const version) More...

double &	tolerance ()
	Access to convergence tolerance. More...

unsigned &	max_iter ()
	Access to max. number of iterations. More...

void	enable_doc_convergence_history ()
	Enable documentation of the convergence history. More...

void	disable_doc_convergence_history ()
	Disable documentation of the convergence history. More...

void	open_convergence_history_file_stream (const std::string &file_name, const std::string &zone_title="")
	Write convergence history into file with specified filename (automatically switches on doc). Optional second argument is a string that can be used (as a zone title) to identify what case we're running (e.g. what combination of linear solver and preconditioner or parameter values are used). More...

void	close_convergence_history_file_stream ()
	Close convergence history output stream. More...

double	jacobian_setup_time () const
	returns the time taken to assemble the jacobian matrix and residual vector More...

double	linear_solver_solution_time () const
	return the time taken to solve the linear system More...

void	enable_setup_preconditioner_before_solve ()
	Setup the preconditioner before the solve. More...

void	disable_setup_preconditioner_before_solve ()
	Don't set up the preconditioner before the solve. More...

void	enable_error_after_max_iter ()
	Throw an error if we don't converge within max_iter. More...

void	disable_error_after_max_iter ()
	Don't throw an error if we don't converge within max_iter (default). More...

void	enable_iterative_solver_as_preconditioner ()
	Enables the iterative solver be used as preconditioner (when calling the solve method it bypass the setup solver method – currently only used by Trilinos solver —) More...

void	disable_iterative_solver_as_preconditioner ()
	Disables the iterative solver be used as preconditioner (when calling the solve method it bypass the setup solver method – currently only used by Trilinos solver —) More...

Public Member Functions inherited from oomph::LinearSolver
	LinearSolver ()
	Empty constructor, initialise the member data. More...

	LinearSolver (const LinearSolver &dummy)=delete
	Broken copy constructor. More...

void	operator= (const LinearSolver &)=delete
	Broken assignment operator. More...

virtual	~LinearSolver ()
	Empty virtual destructor. More...

void	enable_doc_time ()
	Enable documentation of solve times. More...

void	disable_doc_time ()
	Disable documentation of solve times. More...

bool	is_doc_time_enabled () const
	Is documentation of solve times enabled? More...

bool	is_resolve_enabled () const
	Boolean flag indicating if resolves are enabled. More...

virtual void	enable_resolve ()
	Enable resolve (i.e. store matrix and/or LU decomposition, say) Virtual so it can be overloaded to perform additional tasks. More...

virtual void	solve_transpose (Problem *const &problem_pt, DoubleVector &result)
	Solver: Takes pointer to problem and returns the results vector which contains the solution of the linear system defined by the problem's fully assembled Jacobian and residual vector (broken virtual). More...

virtual void	solve_transpose (DoubleMatrixBase *const &matrix_pt, const DoubleVector &rhs, DoubleVector &result)
	Linear-algebra-type solver: Takes pointer to a matrix and rhs vector and returns the solution of the linear system. More...

virtual void	solve_transpose (DoubleMatrixBase *const &matrix_pt, const Vector< double > &rhs, Vector< double > &result)
	Linear-algebra-type solver: Takes pointer to a matrix and rhs vector and returns the solution of the linear system. More...

virtual void	resolve_transpose (const DoubleVector &rhs, DoubleVector &result)
	Solver: Resolve the system defined by the last assembled jacobian and the rhs vector. Solution is returned in the vector result. (broken virtual) More...

virtual void	enable_computation_of_gradient ()
	function to enable the computation of the gradient required for the globally convergent Newton method More...

void	disable_computation_of_gradient ()
	function to disable the computation of the gradient required for the globally convergent Newton method More...

void	reset_gradient ()
	function to reset the size of the gradient before each Newton solve More...

void	get_gradient (DoubleVector &gradient)
	function to access the gradient, provided it has been computed More...

Public Member Functions inherited from oomph::DistributableLinearAlgebraObject
	DistributableLinearAlgebraObject ()
	Default constructor - create a distribution. More...

	DistributableLinearAlgebraObject (const DistributableLinearAlgebraObject &matrix)=delete
	Broken copy constructor. More...

void	operator= (const DistributableLinearAlgebraObject &)=delete
	Broken assignment operator. More...

virtual	~DistributableLinearAlgebraObject ()
	Destructor. More...

LinearAlgebraDistribution *	distribution_pt () const
	access to the LinearAlgebraDistribution More...

unsigned	nrow () const
	access function to the number of global rows. More...

unsigned	nrow_local () const
	access function for the num of local rows on this processor. More...

unsigned	nrow_local (const unsigned &p) const
	access function for the num of local rows on this processor. More...

unsigned	first_row () const
	access function for the first row on this processor More...

unsigned	first_row (const unsigned &p) const
	access function for the first row on this processor More...

bool	distributed () const
	distribution is serial or distributed More...

bool	distribution_built () const
	if the communicator_pt is null then the distribution is not setup then false is returned, otherwise return true More...

void	build_distribution (const LinearAlgebraDistribution *const dist_pt)
	setup the distribution of this distributable linear algebra object More...

void	build_distribution (const LinearAlgebraDistribution &dist)
	setup the distribution of this distributable linear algebra object More...

Private Member Functions
void	solve_helper (DoubleMatrixBase *const &matrix_pt, const DoubleVector &rhs, DoubleVector &solution)
	General interface to solve function. More...

void	clean_up_memory ()
	Clean up data that's stored for resolve (if any has been stored) More...

Private Attributes
CRDoubleMatrix *	Matrix_pt
	System matrix pointer in the format specified by the template argument. More...

unsigned	Iterations
	Number of iterations taken. More...

bool	Resolving
	Boolean flag to indicate if the solve is done in re-solve mode, bypassing setup of matrix and preconditioner. More...

bool	Matrix_can_be_deleted
	Boolean flag to indicate if the matrix pointed to be Matrix_pt can be deleted. More...

Vector< int >	Index_of_diagonal_entries
	Vector whose i'th entry contains the index of the last entry below or on the diagonal of the i'th row of the matrix. More...

Additional Inherited Members
Protected Member Functions inherited from oomph::DistributableLinearAlgebraObject
void	clear_distribution ()
	clear the distribution of this distributable linear algebra object More...

Protected Attributes inherited from oomph::Smoother
bool	Use_as_smoother
	When a derived class object is being used as a smoother in the MG solver (or elsewhere) the residual norm does not need to be calculated because we're simply performing a fixed number of (smoothing) iterations. This boolean is used as a flag to indicate that the IterativeLinearSolver (which this class is by inheritance) is supposed to act in this way. More...

Protected Attributes inherited from oomph::IterativeLinearSolver
bool	Doc_convergence_history
	Flag indicating if the convergence history is to be documented. More...

std::ofstream	Output_file_stream
	Output file stream for convergence history. More...

double	Tolerance
	Convergence tolerance. More...

unsigned	Max_iter
	Maximum number of iterations. More...

Preconditioner *	Preconditioner_pt
	Pointer to the preconditioner. More...

double	Jacobian_setup_time
	Jacobian setup time. More...

double	Solution_time
	linear solver solution time More...

double	Preconditioner_setup_time
	Preconditioner setup time. More...

bool	Setup_preconditioner_before_solve
	indicates whether the preconditioner should be setup before solve. Default = true; More...

bool	Throw_error_after_max_iter
	Should we throw an error instead of just returning when we hit the max iterations? More...

bool	Use_iterative_solver_as_preconditioner
	Use the iterative solver as preconditioner. More...

bool	First_time_solve_when_used_as_preconditioner
	When the iterative solver is used a preconditioner then we call the setup of solver method only once (the first time the solve method is called) More...

Protected Attributes inherited from oomph::LinearSolver
bool	Enable_resolve
	Boolean that indicates whether the matrix (or its factors, in the case of direct solver) should be stored so that the resolve function can be used. More...

bool	Doc_time
	Boolean flag that indicates whether the time taken. More...

bool	Compute_gradient
	flag that indicates whether the gradient required for the globally convergent Newton method should be computed or not More...

bool	Gradient_has_been_computed
	flag that indicates whether the gradient was computed or not More...

DoubleVector	Gradient_for_glob_conv_newton_solve
	DoubleVector storing the gradient for the globally convergent Newton method. More...

Static Protected Attributes inherited from oomph::IterativeLinearSolver
static IdentityPreconditioner	Default_preconditioner
	Default preconditioner: The base class for preconditioners is a fully functional (if trivial!) preconditioner. More...

Detailed Description

//////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////

Explicit template specialisation of the Gauss Seidel method for compressed row format matrices

Definition at line 784 of file iterative_linear_solver.h.

Constructor & Destructor Documentation

◆ GS() [1/2]

oomph::GS< CRDoubleMatrix >::GS ( )

inline

Constructor.

Definition at line 788 of file iterative_linear_solver.h.

◆ ~GS()

virtual oomph::GS< CRDoubleMatrix >::~GS ( )

inlinevirtual

Destructor (cleanup storage)

Definition at line 797 of file iterative_linear_solver.h.

References oomph::GS< MATRIX >::clean_up_memory().

◆ GS() [2/2]

oomph::GS< CRDoubleMatrix >::GS ( const GS< CRDoubleMatrix > & )

delete

Broken copy constructor.

Member Function Documentation

◆ clean_up_memory()

void oomph::GS< CRDoubleMatrix >::clean_up_memory ( )

inlineprivatevirtual

Clean up data that's stored for resolve (if any has been stored)

Reimplemented from oomph::LinearSolver.

Definition at line 958 of file iterative_linear_solver.h.

References oomph::GS< MATRIX >::Matrix_can_be_deleted, and oomph::GS< MATRIX >::Matrix_pt.

◆ disable_resolve()

void oomph::GS< CRDoubleMatrix >::disable_resolve ( )

inlinevirtual

Overload disable resolve so that it cleans up memory too.

Reimplemented from oomph::LinearSolver.

Definition at line 822 of file iterative_linear_solver.h.

References oomph::GS< MATRIX >::clean_up_memory(), and oomph::LinearSolver::disable_resolve().

◆ iterations()

unsigned oomph::GS< CRDoubleMatrix >::iterations ( ) const

inlinevirtual

Number of iterations taken.

Implements oomph::IterativeLinearSolver.

Definition at line 945 of file iterative_linear_solver.h.

References oomph::GS< MATRIX >::Iterations.

◆ operator=()

void oomph::GS< CRDoubleMatrix >::operator= ( const GS< CRDoubleMatrix > & )

delete

Broken assignment operator.

◆ preconditioner_setup_time()

double oomph::GS< CRDoubleMatrix >::preconditioner_setup_time ( ) const

inlinevirtual

Returns the time taken to set up the preconditioner.

Reimplemented from oomph::IterativeLinearSolver.

Definition at line 929 of file iterative_linear_solver.h.

References oomph::Global_string_for_annotation::string().

◆ resolve()

void oomph::GS< CRDoubleMatrix >::resolve	(	const DoubleVector &	rhs,
		DoubleVector &	result
	)

inlinevirtual

Re-solve the system defined by the last assembled Jacobian and the rhs vector specified here. Solution is returned in the vector result.

Reimplemented from oomph::LinearSolver.

Definition at line 906 of file iterative_linear_solver.h.

References oomph::GS< MATRIX >::Matrix_pt, oomph::GS< MATRIX >::Resolving, and oomph::GS< MATRIX >::solve().

◆ setup_helper()

void oomph::GS< CRDoubleMatrix >::setup_helper ( DoubleMatrixBase * matrix_pt )

Generic setup function to sort out everything that needs to be set up with regards to the input matrix.

Explicit template specialisation of the smoother_setup function for CR matrices. Set up the smoother for the matrix specified by the pointer. This definition of the smoother_setup has the added functionality that it sorts the entries in the given matrix so that the CRDoubleMatrix implementation of the solver can be used.

Definition at line 1435 of file iterative_linear_solver.cc.

References oomph::GS< MATRIX >::Matrix_can_be_deleted, and oomph::GS< MATRIX >::Matrix_pt.

◆ smoother_setup()

void oomph::GS< CRDoubleMatrix >::smoother_setup ( DoubleMatrixBase * matrix_pt )

inlinevirtual

Set up the smoother for the matrix specified by the pointer.

Implements oomph::Smoother.

Definition at line 829 of file iterative_linear_solver.h.

References oomph::GS< MATRIX >::Matrix_can_be_deleted.

◆ smoother_solve()

void oomph::GS< CRDoubleMatrix >::smoother_solve	(	const DoubleVector &	rhs,
		DoubleVector &	result
	)

inlinevirtual

The smoother_solve function performs fixed number of iterations on the system A*result=rhs. The number of (smoothing) iterations is the same as the max. number of iterations in the underlying IterativeLinearSolver class.

Implements oomph::Smoother.

Definition at line 812 of file iterative_linear_solver.h.

References oomph::GS< MATRIX >::Matrix_pt, oomph::GS< MATRIX >::solve_helper(), and oomph::Smoother::Use_as_smoother.

◆ solve() [1/3]

void oomph::GS< CRDoubleMatrix >::solve	(	DoubleMatrixBase *const &	matrix_pt,
		const DoubleVector &	rhs,
		DoubleVector &	solution
	)

inlinevirtual

Linear-algebra-type solver: Takes pointer to a matrix and rhs vector and returns the solution of the linear system.

Reimplemented from oomph::LinearSolver.

Definition at line 853 of file iterative_linear_solver.h.

References oomph::DistributableLinearAlgebraObject::build_distribution(), oomph::DistributableLinearAlgebraObject::distribution_pt(), oomph::LinearSolver::Enable_resolve, oomph::GS< MATRIX >::Matrix_can_be_deleted, oomph::GS< MATRIX >::Matrix_pt, oomph::GS< MATRIX >::Resolving, oomph::GS< MATRIX >::solve_helper(), and oomph::Smoother::Use_as_smoother.

◆ solve() [2/3]

void oomph::GS< CRDoubleMatrix >::solve	(	DoubleMatrixBase *const &	matrix_pt,
		const Vector< double > &	rhs,
		Vector< double > &	result
	)

inlinevirtual

Linear-algebra-type solver: Takes pointer to a matrix and rhs vector and returns the solution of the linear system Call the broken base-class version. If you want this, please implement it.

Reimplemented from oomph::LinearSolver.

Definition at line 896 of file iterative_linear_solver.h.

References oomph::LinearSolver::solve().

◆ solve() [3/3]

void oomph::GS< CRDoubleMatrix >::solve	(	Problem *const &	problem_pt,
		DoubleVector &	result
	)

virtual

Solver: Takes pointer to problem and returns the results vector which contains the solution of the linear system defined by the problem's fully assembled Jacobian and residual vector.

//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////

Explicit template specialisation of the solver for CR matrices: Takes pointer to problem and returns the results vector which contains the solution of the linear system defined by the problem's fully assembled Jacobian and residual vector.

Implements oomph::LinearSolver.

Definition at line 1362 of file iterative_linear_solver.cc.

References oomph::DoubleVector::build(), oomph::DistributableLinearAlgebraObject::build_distribution(), oomph::GS< MATRIX >::clean_up_memory(), oomph::Problem::communicator_pt(), oomph::DistributableLinearAlgebraObject::distribution_pt(), oomph::LinearSolver::Doc_time, oomph::LinearSolver::Enable_resolve, oomph::Problem::get_jacobian(), oomph::IterativeLinearSolver::Jacobian_setup_time, oomph::GS< MATRIX >::Matrix_can_be_deleted, oomph::GS< MATRIX >::Matrix_pt, oomph::Problem::ndof(), oomph::oomph_info, oomph::GS< MATRIX >::Resolving, oomph::GS< MATRIX >::solve_helper(), oomph::TimingHelpers::timer(), and oomph::Smoother::Use_as_smoother.

◆ solve_helper()

void oomph::GS< CRDoubleMatrix >::solve_helper	(	DoubleMatrixBase *const &	matrix_pt,
		const DoubleVector &	rhs,
		DoubleVector &	solution
	)

private

General interface to solve function.

Explicit template specialisation of the solve_helper function for CR matrices. Exploiting the sparsity of the given matrix allows for a much faster iterative solver.

Definition at line 1480 of file iterative_linear_solver.cc.

References oomph::DoubleVector::build(), oomph::LinearAlgebraDistribution::built(), oomph::CRDoubleMatrix::column_index(), oomph::DistributableLinearAlgebraObject::distribution_pt(), oomph::IterativeLinearSolver::Doc_convergence_history, oomph::LinearSolver::Doc_time, i, oomph::DoubleVector::initialise(), oomph::GS< MATRIX >::Iterations, oomph::IterativeLinearSolver::Max_iter, oomph::DoubleVector::norm(), oomph::DistributableLinearAlgebraObject::nrow(), oomph::oomph_info, oomph::IterativeLinearSolver::Output_file_stream, oomph::DoubleMatrixBase::residual(), oomph::CRDoubleMatrix::row_start(), oomph::IterativeLinearSolver::Solution_time, oomph::Global_string_for_annotation::string(), oomph::IterativeLinearSolver::Throw_error_after_max_iter, oomph::TimingHelpers::timer(), oomph::IterativeLinearSolver::Tolerance, oomph::Smoother::Use_as_smoother, and oomph::CRDoubleMatrix::value().

Member Data Documentation

◆ Index_of_diagonal_entries

Vector<int> oomph::GS< CRDoubleMatrix >::Index_of_diagonal_entries

private

Vector whose i'th entry contains the index of the last entry below or on the diagonal of the i'th row of the matrix.

Definition at line 988 of file iterative_linear_solver.h.

◆ Iterations

unsigned oomph::GS< CRDoubleMatrix >::Iterations

private

Number of iterations taken.

Definition at line 976 of file iterative_linear_solver.h.

◆ Matrix_can_be_deleted

bool oomph::GS< CRDoubleMatrix >::Matrix_can_be_deleted

private

Boolean flag to indicate if the matrix pointed to be Matrix_pt can be deleted.

Definition at line 984 of file iterative_linear_solver.h.

◆ Matrix_pt

CRDoubleMatrix* oomph::GS< CRDoubleMatrix >::Matrix_pt

private

System matrix pointer in the format specified by the template argument.

Definition at line 973 of file iterative_linear_solver.h.

◆ Resolving

bool oomph::GS< CRDoubleMatrix >::Resolving

private

Boolean flag to indicate if the solve is done in re-solve mode, bypassing setup of matrix and preconditioner.

Definition at line 980 of file iterative_linear_solver.h.

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

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ GS() [1/2]

◆ ~GS()

◆ GS() [2/2]

Member Function Documentation

◆ clean_up_memory()

◆ disable_resolve()

◆ iterations()

◆ operator=()

◆ preconditioner_setup_time()

◆ resolve()

◆ setup_helper()

◆ smoother_setup()

◆ smoother_solve()

◆ solve() [1/3]

◆ solve() [2/3]

◆ solve() [3/3]

◆ solve_helper()

Member Data Documentation

◆ Index_of_diagonal_entries

◆ Iterations

◆ Matrix_can_be_deleted

◆ Matrix_pt

◆ Resolving