TrilinosWrappers::PreconditionSSOR Class Reference

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

Inheritance diagram for TrilinosWrappers::PreconditionSSOR:

Classes
struct	AdditionalData

Public Member Functions
void	initialize (const SparseMatrix &matrix, const AdditionalData &additional_data=AdditionalData())
Public Member Functions inherited from TrilinosWrappers::PreconditionBase
	PreconditionBase ()
	PreconditionBase (const PreconditionBase &)
	~PreconditionBase ()=default
void	clear ()
MPI_Comm	get_mpi_communicator () const
void	transpose ()
virtual void	vmult (MPI::Vector &dst, const MPI::Vector &src) const
virtual void	Tvmult (MPI::Vector &dst, const MPI::Vector &src) const
virtual void	vmult (::Vector< double > &dst, const ::Vector< double > &src) const
virtual void	Tvmult (::Vector< double > &dst, const ::Vector< double > &src) const
virtual void	vmult (::LinearAlgebra::distributed::Vector< double > &dst, const ::LinearAlgebra::distributed::Vector< double > &src) const
virtual void	Tvmult (::LinearAlgebra::distributed::Vector< double > &dst, const ::LinearAlgebra::distributed::Vector< double > &src) const
Epetra_Operator &	trilinos_operator () const
IndexSet	locally_owned_domain_indices () const
IndexSet	locally_owned_range_indices () const
Public Member Functions inherited from Subscriptor
	Subscriptor ()
	Subscriptor (const Subscriptor &)
	Subscriptor (Subscriptor &&) noexcept
virtual	~Subscriptor ()
Subscriptor &	operator= (const Subscriptor &)
Subscriptor &	operator= (Subscriptor &&) noexcept
void	subscribe (const char *identifier=nullptr) const
void	unsubscribe (const char *identifier=nullptr) const
unsigned int	n_subscriptions () const
void	list_subscribers () const
template<class Archive >
void	serialize (Archive &ar, const unsigned int version)

Additional Inherited Members
Public Types inherited from TrilinosWrappers::PreconditionBase
typedef ::types::global_dof_index	size_type
Static Public Member Functions inherited from TrilinosWrappers::PreconditionBase
static ::ExceptionBase &	ExcNonMatchingMaps (std::string arg1)
Static Public Member Functions inherited from Subscriptor
static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)
static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)
Protected Attributes inherited from TrilinosWrappers::PreconditionBase
std::shared_ptr< Epetra_Operator >	preconditioner
Epetra_MpiComm	communicator
std::shared_ptr< Epetra_Map >	vector_distributor

Detailed Description

A wrapper class for a (pointwise) SSOR preconditioner for Trilinos matrices. This preconditioner works both in serial and in parallel, depending on the matrix it is based on.

The AdditionalData data structure allows to set preconditioner options. For the SSOR preconditioner, these options are the damping/relaxation parameter omega, a min_diagonal argument that can be used to make the preconditioner work even if the matrix contains some zero elements on the diagonal, and a parameter overlap that determines if and how much overlap there should be between the matrix partitions on the various MPI processes. The default settings are 1 for the relaxation parameter, 0 for the diagonal augmentation and 0 for the overlap.

Note that a parallel application of the SSOR preconditioner is actually a block-Jacobi preconditioner with block size equal to the local matrix size. Spoken more technically, this parallel operation is an additive Schwarz method with an SSOR approximate solve as inner solver, based on the outer parallel partitioning.

Author

Wolfgang Bangerth, 2008

Definition at line 345 of file trilinos_precondition.h.

Member Function Documentation

initialize()

void PreconditionSSOR< MatrixType >::initialize	(	const SparseMatrix &	matrix,
		const AdditionalData &	additional_data = AdditionalData()
	)

Take the sparse matrix the preconditioner object should be built of, and additional flags (damping parameter, overlap in parallel computations, etc.) if there are any.

Definition at line 166 of file trilinos_precondition.cc.

---

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

• deal.II/lac/trilinos_precondition.h
• source/lac/trilinos_precondition.cc