#include <la_linsys_new.hh>

Collaboration diagram for MatrixSimple:

Public Types
enum	SetValuesMode { INSERT =INSERT_VALUES, ADD =ADD_VALUES, ALLOCATE, DONE, NONE }
	possible states of the matrix More...

typedef *	block

Public Member Functions
	MatrixSimple (unsigned int loc_row_size, unsigned int col_size)
	Construct a parallel system with given local size. More...

void	multiply (Vec x, Vec y)
	multiply PETSC vector: y=Ax More...

void	multiply_add (Vec x, Vec b, Vec y)
	multiply vector and ad onother one: y=Ax+b More...

void	multiply_mat (...)
	multiply matrix .. has to deal with preallocation of result and reuse of structure More...

void	axpy (...)

void	aypx (...)

virtual void	start_allocation ()=0

void	start_add_assembly ()

void	start_insert_assembly ()

void	finalize (MatAssemblyType assembly_type=MAT_FINAL_ASSEMBLY)

virtual void	preallocate_matrix ()=0

virtual void	preallocate_values (int nrow, int rows, int ncol, int cols)=0

virtual void	view_local_matrix ()=0

void	mat_set_values (int nrow, int rows, int ncol, int cols, PetscScalar *vals)
	Set full rectangular submatrix of the system matrix. More...

void	mat_set_value (int row, int col, PetscScalar val)
	Set one element of the system matrix. More...

void	set_symmetric (bool flag=true)

bool	is_symmetric ()

void	set_positive_definite (bool flag=true)

bool	is_positive_definite ()

void	view (std::ostream output_stream, int row_mapping=NULL, int col_mapping=NULL)
	Output the matrix in the Matlab format possibly with given renumbering of rows/cols. More...

virtual	~LinSys ()

access members @{
Access to distribution of rows, thhrou that you can get also matix size and local size. But for convenience we provide also direct functions
Distribution &	get_row_ds ()

Distribution &	get_col_ds ()

unsigned int	size ()
	Get global system size. More...

const Mat &	get_matrix ()
	Get matrix. SHOULD NOT BE USED !!! More...

Protected Attributes
Distribution	row_ds
	Distribution of continuous blocks of system rows among the processors. More...

Distribution	col_ds
	Distribution of multiplied vector. More...

bool	symmetric
	Flag for the symmetric system. More...

bool	positive_definite
	Flag for positive definite system. More...

SetValuesMode	status
	Set value status of the linear system. More...

Mat	matrix
	Petsc matrix of the problem. More...

Detailed Description

Classes for block linear systems. Namely it should provide following functionality: 1) interface to various PETSC (or possibly other) matrices, with preallocation through the set_values method 2) For coupling problems creation of the global linear system by connectiong sub systems of individual equations. Working cycle could be:

creation of sub problems up to the global problem (just matrix dimensions and types)
pre assembly - > preallocation
assembly - by the same functions
matrix modifications (schur complements, assembly of one global matrix, preconditioners ...
iterative solution in parallel
for nonlinear/time problems: jump to 3. and reuse the structures

3) Solution through explicit or implicit schur complements 4) Preconditioning for coupled problems . 5) In assembly, the access to the matrices in LinSys hierarchy is through successive call of block(i,j) method, but there also should be a class or another mechanism how to represent a coordinate in the hierarchy. Then one can access a MatriSimple directly by two coordinates and constantly access correct part of rhs vector

Virtual test cases:

Only water flow solved by 1, 2, 3, or 4 (Newton BC) Schur complements, explict and implicit Ideal: switch between Implicit and explicit only changing the particular class or some thing similarly simple
Unsolved design problems:
PETSC neumoznuje blokove vektory, tj. vektory by mely byt globalni a z nich by se mely pouzivat podvektory mozne reseni: blokovy globalni vektor se hierarchicky vytvari (pouze velikosti) a pak slouzi jako "fabrika" na globalni vektory i subvektory a nebo pro pristup k subvektorum globalniho vektoru .. detaily Abstract class for frontend for PETSc matrices. purpose:
allow preallocation through double assembly
make interface to PETSC since PETSC evolve and it is simpler to make changes on one place
make documented interface to PETSC and document used PETSC functionality this way

Questions:

how to setup column distribution. It is necessary only for some of PETSC formats, isn't it?

Definition at line 62 of file la_linsys_new.hh.

Member Typedef Documentation

typedef * MatrixSimple::block

Member Enumeration Documentation

enum MatrixSimple::SetValuesMode

possible states of the matrix

Enumerator
INSERT
ADD
ALLOCATE
DONE
NONE

Definition at line 65 of file la_linsys_new.hh.

Constructor & Destructor Documentation

MatrixSimple::MatrixSimple	(	unsigned int	loc_row_size,
		unsigned int	col_size
	)

Construct a parallel system with given local size.

virtual MatrixSimple::~LinSys ( )

virtual

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Member Function Documentation

void MatrixSimple::axpy ( ... )

add and scale sparse matrices ... has to deal with different nonzero structures, in such a case petsc rutines are inceribly slow

void MatrixSimple::aypx ( ... )

void MatrixSimple::finalize ( MatAssemblyType assembly_type = MAT_FINAL_ASSEMBLY )

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Distribution& MatrixSimple::get_col_ds ( )

const Mat& MatrixSimple::get_matrix ( )

inline

Get matrix. SHOULD NOT BE USED !!!

Definition at line 95 of file la_linsys_new.hh.

Distribution& MatrixSimple::get_row_ds ( )

bool MatrixSimple::is_positive_definite ( )

inline

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bool MatrixSimple::is_symmetric ( )

inline

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void MatrixSimple::mat_set_value	(	int	row,
		int	col,
		PetscScalar	val
	)

inline

Set one element of the system matrix.

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void MatrixSimple::mat_set_values	(	int	nrow,
		int *	rows,
		int	ncol,
		int *	cols,
		PetscScalar *	vals
	)

Set full rectangular submatrix of the system matrix.

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void MatrixSimple::multiply	(	Vec	x,
		Vec	y
	)

multiply PETSC vector: y=Ax

void MatrixSimple::multiply_add	(	Vec	x,
		Vec	b,
		Vec	y
	)

multiply vector and ad onother one: y=Ax+b

void MatrixSimple::multiply_mat ( ... )

multiply matrix .. has to deal with preallocation of result and reuse of structure

virtual void MatrixSimple::preallocate_matrix ( )

pure virtual

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virtual void MatrixSimple::preallocate_values	(	int	nrow,
		int *	rows,
		int	ncol,
		int *	cols
	)

pure virtual

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void MatrixSimple::set_positive_definite ( bool flag = true )

inline

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void MatrixSimple::set_symmetric ( bool flag = true )

inline

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unsigned int MatrixSimple::size ( )

inline

Get global system size.

void MatrixSimple::start_add_assembly ( )

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virtual void MatrixSimple::start_allocation ( )

pure virtual

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void MatrixSimple::start_insert_assembly ( )

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void MatrixSimple::view	(	std::ostream	output_stream,
		int *	row_mapping = `NULL`,
		int *	col_mapping = `NULL`
	)

Output the matrix in the Matlab format possibly with given renumbering of rows/cols.

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virtual void MatrixSimple::view_local_matrix ( )

pure virtual

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Member Data Documentation

Distribution MatrixSimple::col_ds

protected

Distribution of multiplied vector.

Definition at line 128 of file la_linsys_new.hh.

Mat MatrixSimple::matrix

protected

Petsc matrix of the problem.

Definition at line 133 of file la_linsys_new.hh.

bool MatrixSimple::positive_definite

protected

Flag for positive definite system.

Definition at line 130 of file la_linsys_new.hh.

Distribution MatrixSimple::row_ds

protected

Distribution of continuous blocks of system rows among the processors.

Definition at line 127 of file la_linsys_new.hh.

SetValuesMode MatrixSimple::status

protected

Set value status of the linear system.

Definition at line 131 of file la_linsys_new.hh.

bool MatrixSimple::symmetric

protected

Flag for the symmetric system.

Definition at line 129 of file la_linsys_new.hh.

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

/opt/flow123d/flow123d/src/la/la_linsys_new.hh

Public Types

Public Member Functions

Protected Attributes

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation