PETScWrappers::PreconditionParaSails Class Reference

#include <petsc_precondition.h>

Inheritance diagram for PETScWrappers::PreconditionParaSails:

Classes
struct	AdditionalData

Public Member Functions
	PreconditionParaSails ()
	PreconditionParaSails (const MatrixBase &matrix, const AdditionalData &additional_data=AdditionalData())
void	initialize (const MatrixBase &matrix, const AdditionalData &additional_data=AdditionalData())
Public Member Functions inherited from PETScWrappers::PreconditionerBase
	PreconditionerBase ()
virtual	~PreconditionerBase ()
void	vmult (VectorBase &dst, const VectorBase &src) const
const PC &	get_pc () const

Private Attributes
AdditionalData	additional_data

Additional Inherited Members
Protected Member Functions inherited from PETScWrappers::PreconditionerBase
void	create_pc ()
	operator Mat () const
Protected Attributes inherited from PETScWrappers::PreconditionerBase
PC	pc
Mat	matrix

Detailed Description

A class that implements the interface to use the ParaSails sparse approximate inverse preconditioner from the HYPRE suite. Note that PETSc has to be configured with HYPRE (e.g. with –download-hypre=1).

ParaSails uses least-squares minimization to compute a sparse approximate inverse. The sparsity pattern used is the pattern of a power of a sparsified matrix. ParaSails also uses a post-filtering technique to reduce the cost of applying the preconditioner.

ParaSails solves symmetric positive definite (SPD) problems using a factorized SPD preconditioner and can also solve general (nonsymmetric and/or indefinite) problems with a nonfactorized preconditioner. The problem type has to be set in AdditionalData.

The preconditioner does support parallel distributed computations.

Author

Martin Steigemann, 2012

Definition at line 873 of file petsc_precondition.h.

Constructor & Destructor Documentation

PETScWrappers::PreconditionParaSails::PreconditionParaSails

(

)

Empty Constructor. You need to call initialize() before using this object.

PETScWrappers::PreconditionParaSails::PreconditionParaSails	(	const MatrixBase &	matrix,
		const AdditionalData &	additional_data = AdditionalData()
	)

Constructor. Take the matrix which is used to form the preconditioner, and additional flags if there are any.

Member Function Documentation

void PETScWrappers::PreconditionParaSails::initialize	(	const MatrixBase &	matrix,
		const AdditionalData &	additional_data = AdditionalData()
	)

Initializes the preconditioner object and calculate all data that is necessary for applying it in a solver. This function is automatically called when calling the constructor with the same arguments and is only used if you create the preconditioner without arguments.

Member Data Documentation

AdditionalData PETScWrappers::PreconditionParaSails::additional_data

private

Store a copy of the flags for this particular preconditioner.

Definition at line 999 of file petsc_precondition.h.

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

• include/deal.II/lac/petsc_precondition.h