PETScWrappers::PreconditionParaSails Class Reference

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

Inheritance diagram for PETScWrappers::PreconditionParaSails:

Classes
struct	AdditionalData

Public Member Functions
	PreconditionParaSails ()=default
	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	clear ()
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 812 of file petsc_precondition.h.

Constructor & Destructor Documentation

PETScWrappers::PreconditionParaSails::PreconditionParaSails ( )

default

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.

Definition at line 565 of file petsc_precondition.cc.

Member Function Documentation

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

Initialize 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.

Definition at line 574 of file petsc_precondition.cc.

Member Data Documentation

AdditionalData PETScWrappers::PreconditionParaSails::additional_data

private

Store a copy of the flags for this particular preconditioner.

Definition at line 912 of file petsc_precondition.h.

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

• deal.II/lac/petsc_precondition.h
• /mnt/data/darndt/Sources/dealii-clang-6.0.0/source/lac/petsc_precondition.cc