Dune::Amg::FastAMG< M, X, PI, A > Class Template Reference

A fast (sequential) algebraic multigrid based on agglomeration that saves memory bandwidth. More...

#include <dune/istl/paamg/fastamg.hh>

Public Types
enum	{ category = SolverCategory::sequential }
typedef M	Operator
	The matrix operator type.
typedef PI	ParallelInformation
	The type of the parallel information. Either OwnerOverlapCommunication or another type describing the parallel data distribution and providing communication methods.
typedef MatrixHierarchy< M, ParallelInformation, A >	OperatorHierarchy
	The operator hierarchy type.
typedef OperatorHierarchy::ParallelInformationHierarchy	ParallelInformationHierarchy
	The parallal data distribution hierarchy type.
typedef X	Domain
	The domain type.
typedef X	Range
	The range type.
typedef InverseOperator< X, X >	CoarseSolver
	the type of the coarse solver.
typedef X	domain_type
	The domain type of the preconditioner.
typedef X	range_type
	The range type of the preconditioner.
typedef X::field_type	field_type
	The field type of the preconditioner.

Public Member Functions
	FastAMG (const OperatorHierarchy &matrices, CoarseSolver &coarseSolver, const Parameters &parms, bool symmetric=true)
	Construct a new amg with a specific coarse solver. More...
template<class C >
	FastAMG (const Operator &fineOperator, const C &criterion, const Parameters &parms=Parameters(), bool symmetric=true, const ParallelInformation &pinfo=ParallelInformation())
	Construct an AMG with an inexact coarse solver based on the smoother. More...
	FastAMG (const FastAMG &amg)
	Copy constructor.
void	pre (Domain &x, Range &b)
	Prepare the preconditioner. More...
void	apply (Domain &v, const Range &d)
	Apply one step of the preconditioner to the system A(v)=d. More...
void	post (Domain &x)
	Clean up. More...
template<class A1 >
void	getCoarsestAggregateNumbers (std::vector< std::size_t, A1 > &cont)
	Get the aggregate number of each unknown on the coarsest level. More...
void	recalculateHierarchy ()
	Recalculate the matrix hierarchy. More...
bool	usesDirectCoarseLevelSolver () const
	Check whether the coarse solver used is a direct solver. More...

Detailed Description

template<class M, class X, class PI = SequentialInformation, class A = std::allocator<X>>
class Dune::Amg::FastAMG< M, X, PI, A >

A fast (sequential) algebraic multigrid based on agglomeration that saves memory bandwidth.

It combines one Gauss-Seidel smoothing sweep with the defect calculation to reduce memory transfers.

Template Parameters

M	The matrix type
X	The vector type
PI	Currently ignored.
A	An allocator for X

---

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

• dune/istl/paamg/fastamg.hh