geosx::CGsolver< VECTOR > Class Template Reference

This class implements Conjugate Gradient method for monolithic and block linear operators. More...

#include <CGsolver.hpp>

Inheritance diagram for geosx::CGsolver< VECTOR >:

Public Types
using	Base = KrylovSolver< VECTOR >
	Alias for base type.
using	Vector = typename Base::Vector
	Alias for template parameter.
Public Types inherited from geosx::KrylovSolver< VECTOR >
using	Base = LinearOperator< VECTOR >
	Base type.
using	Vector = typename Base::Vector
	Alias for template parameter.
Public Types inherited from geosx::LinearOperator< VECTOR >
using	Vector = VECTOR
	Alias for template parameter.

Public Member Functions
Constructor/Destructor Methods
	CGsolver (LinearOperator< Vector > const &A, LinearOperator< Vector > const &M, real64 const tolerance, localIndex const maxIterations, integer const verbosity=0)
	Constructor. More...
virtual	~CGsolver () override
	Virtual destructor.
KrylovSolver interface
virtual void	solve (Vector const &b, Vector &x) const override final
	Solve preconditioned system. More...
virtual string	methodName () const override final
	Get name of the Krylov subspace method. More...
Public Member Functions inherited from geosx::KrylovSolver< VECTOR >
	KrylovSolver (LinearOperator< Vector > const &matrix, LinearOperator< Vector > const &precond, real64 const tolerance, localIndex const maxIterations, integer const verbosity)
	Constructor. More...
virtual	~KrylovSolver () override=default
	Virtual destructor.
virtual void	solve (Vector const &b, Vector &x) const =0
	Solve preconditioned system. More...
virtual void	apply (Vector const &src, Vector &dst) const override final
	Apply operator to a vector. More...
virtual globalIndex	numGlobalRows () const override final
	Get the number of global rows. More...
virtual globalIndex	numGlobalCols () const override final
	Get the number of global columns. More...
LinearSolverResult const &	result () const
	Get result of a linear solve. More...
arrayView1d< real64 const >	history () const
	Get convergence history of a linear solve. More...
integer	getLogLevel () const
	Get log level. More...
Public Member Functions inherited from geosx::LinearOperator< VECTOR >
	LinearOperator ()=default
	Constructor.
virtual	~LinearOperator ()=default
	Destructor.
virtual void	apply (Vector const &src, Vector &dst) const =0
	Apply operator to a vector. More...
virtual void	residual (Vector const &x, Vector const &b, Vector &r) const
	Compute residual r = Ax - b. More...

Protected Types
using	VectorTemp = typename KrylovSolver< VECTOR >::VectorTemp
	Alias for vector type that can be used for temporaries.
Protected Types inherited from geosx::KrylovSolver< VECTOR >
using	VectorTemp = typename VectorStorageHelper< VECTOR >::type
	Alias for vector type that can be used for temporaries.

Additional Inherited Members
Static Public Member Functions inherited from geosx::KrylovSolver< VECTOR >
static std::unique_ptr< KrylovSolver< VECTOR > >	Create (LinearSolverParameters const &parameters, LinearOperator< VECTOR > const &matrix, LinearOperator< VECTOR > const &precond)
	Factory method for instantiating Krylov solver objects. More...
Protected Member Functions inherited from geosx::KrylovSolver< VECTOR >
void	logProgress (localIndex const iter, real64 const rnorm) const
	Output iteration progress (called by implementations). More...
void	logResult () const
	Output convergence result (called by implementations).
Static Protected Member Functions inherited from geosx::KrylovSolver< VECTOR >
static VectorTemp	createTempVector (Vector const &src)
	Helper function to create temporary vectors based on a source vector. More...
Protected Attributes inherited from geosx::KrylovSolver< VECTOR >
LinearOperator< Vector > const &	m_operator
	reference to the operator to be solved
LinearOperator< Vector > const &	m_precond
	reference to the preconditioning operator
real64	m_tolerance
	relative residual norm reduction tolerance
localIndex	m_maxIterations
	maximum number of Krylov iterations
integer	m_logLevel
	solver verbosity level
LinearSolverResult	m_result
	results of a solve
array1d< real64 >	m_residualNorms
	Absolute residual norms at each iteration (if available)

Detailed Description

template<typename VECTOR>
class geosx::CGsolver< VECTOR >

This class implements Conjugate Gradient method for monolithic and block linear operators.

Template Parameters

VECTOR

type of vectors this solver operates on.

Note

The notation is consistent with "Iterative Methods for Linear and Non-Linear Equations" from C.T. Kelley (1995) and "Iterative Methods for Sparse Linear Systems" from Y. Saad (2003).

Definition at line 37 of file CGsolver.hpp.

Constructor & Destructor Documentation

CGsolver()

template<typename VECTOR >

geosx::CGsolver< VECTOR >::CGsolver	(	LinearOperator< Vector > const &	A,
		LinearOperator< Vector > const &	M,
		real64 const	tolerance,
		localIndex const	maxIterations,
		integer const	verbosity = 0
	)

Constructor.

Parameters

[in]	A	reference to the system matrix.
[in]	M	reference to the preconditioning operator.
[in]	tolerance	relative residual norm reduction tolerance.
[in]	maxIterations	maximum number of Krylov iterations.
[in]	verbosity	solver verbosity level.

Member Function Documentation

methodName()

template<typename VECTOR >

virtual string geosx::CGsolver< VECTOR >::methodName ( ) const

inlinefinaloverridevirtual

Get name of the Krylov subspace method.

Returns

the abbreviated name of the method

Implements geosx::KrylovSolver< VECTOR >.

Definition at line 85 of file CGsolver.hpp.

solve()

template<typename VECTOR >

virtual void geosx::CGsolver< VECTOR >::solve ( Vector const &  b, Vector &  x  ) const

finaloverridevirtual

Solve preconditioned system.

Parameters

[in]	b	system right hand side.
[in,out]	x	system solution (input = initial guess, output = solution).

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

• coreComponents/linearAlgebra/solvers/CGsolver.hpp