PETScSchurPC Class Reference

Class implementing a Schur-complement preconditioner for 2-block systems. More...

#include <PETScSchurPC.h>

Collaboration diagram for PETScSchurPC:

Public Member Functions
	PETScSchurPC (PC &pc_init, const std::vector< Mat > &blocks, const LinSolParams::BlockParams &params, const ProcessAdm &adm)
	The constructor sets up the preconditioner. More...
	~PETScSchurPC ()
	The destructor frees the PETSc structures.

Static Public Member Functions
static PetscErrorCode	Apply_Schur (Mat A, Vec x, Vec y)
	PETSc compatible function applying the Schur complement matrix. More...
static PetscErrorCode	Apply_Outer (PC pc, Vec x, Vec y)
	PETSc compatible function applying the Schur complement preconditioner. More...
static PetscErrorCode	Destroy (PC pc)
	Destroy a Schur preconditioner. More...

Protected Attributes
KSP	inner_ksp
	The KSP for the approximation of inner matrix inverse.
KSP	outer_ksp
	The KSP for the approximated Schur complement.
Mat	outer_mat
	Matrix shell describing the Schur complement.
Vec	tmp
	Temporary vector.
const std::vector< Mat > *	m_blocks
	Matrix blocks in system.

Detailed Description

Class implementing a Schur-complement preconditioner for 2-block systems.

Constructor & Destructor Documentation

PETScSchurPC()

PETScSchurPC::PETScSchurPC	(	PC &	pc_init,
		const std::vector< Mat > &	blocks,
		const LinSolParams::BlockParams &	params,
		const ProcessAdm &	adm
	)

The constructor sets up the preconditioner.

Parameters

pc_init	The PETSc PC to set up
blocks	The matrix blocks
params	Linear solver parameters
adm	Processes administrator

References Apply_Outer(), Apply_Schur(), Destroy(), SettingMap::getDoubleValue(), SettingMap::getIntValue(), SettingMap::getStringValue(), inner_ksp, outer_ksp, outer_mat, and tmp.

Member Function Documentation

Apply_Outer()

PetscErrorCode PETScSchurPC::Apply_Outer ( PC  pc, Vec  x, Vec  y  )

static

PETSc compatible function applying the Schur complement preconditioner.

Parameters

pc	Shell preconditioner to apply
x	Vector to apply preconditioner to
y	Result of preconditioner evaluation

References outer_ksp.

Referenced by PETScSchurPC().

Apply_Schur()

PetscErrorCode PETScSchurPC::Apply_Schur ( Mat  A, Vec  x, Vec  y  )

static

PETSc compatible function applying the Schur complement matrix.

Parameters

A	Shell matrix to apply
x	Vector to apply matrix to
y	Result of matrix-vector product

References inner_ksp, m_blocks, and tmp.

Referenced by PETScSchurPC().

Destroy()

PetscErrorCode PETScSchurPC::Destroy ( PC  pc )

static

Destroy a Schur preconditioner.

Parameters

pc	Preconditioner to destroy

Referenced by PETScSchurPC().

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

• src/LinAlg/PETScSchurPC.h
• src/LinAlg/PETScSchurPC.C