precon.h File Reference

Header file for preconditioners for Krylov subspace methods. More...

#include "ucfd_types.h"
#include "config.h"

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Functions
ucfd_status_t	bilu_prepare (int bn, int *iw, int *row_ptr, int *col_ind, int *diag_ind, double *nnz_data)
	Block fill-in Incomplete LU preconditioner for BSR matrix format. More...
void	bilu_psolve (int bn, int *row_ptr, int *col_ind, int *diag_ind, double *nnz_data, double *b)
	Solver function for BILU preconditioner. More...
ucfd_status_t	lusgs_prepare (int bn, int *diag_ind, double *nnz_data)
	LU-SGS preconditioner for BSR matrix format. More...
void	lusgs_psolve (int bn, int *row_ptr, int *col_ind, int *diag_ind, double *nnz_data, double *b)
	Solver function for LU-SGS preconditioner. More...
void	none_psolve (int bn, int *row_ptr, int *col_ind, int *diag_ind, double *nnz_data, double *b)
	Unpreconditioned solver. More...

Detailed Description

Header file for preconditioners for Krylov subspace methods.

Declaration of each prepare/psolve function. prepare must be executed before Krylov method routine starts. psolve function is executed in Krylov method to solve Px = b.

Definition in file precon.h.

Function Documentation

bilu_prepare()

ucfd_status_t bilu_prepare	(	int	bn,
		int *	iw,
		int *	row_ptr,
		int *	col_ind,
		int *	diag_ind,
		double *	nnz_data
	)

Block fill-in Incomplete LU preconditioner for BSR matrix format.

Parameters

bn	Number of element cells
blk	Block size of BSR matrix
iw	Working array
row_ptr	Row-directional index pointer array of the matrix
col_ind	Column index array of the matrix
diag_ind	Diagonal matrix index array based on row_ptr
nnz_data	Non-zero value array of the matrix

This function refactors non-zero values of BSR matrix applying block fill-in process.

Definition at line 35 of file precon.c.

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bilu_psolve()

void bilu_psolve	(	int	bn,
		int *	row_ptr,
		int *	col_ind,
		int *	diag_ind,
		double *	nnz_data,
		double *	b
	)

Solver function for BILU preconditioner.

Parameters

bn	Number of element cells
blk	Block size of BSR matrix
row_ptr	Row-directional index pointer array of the matrix
col_ind	Column index array of the matrix
diag_ind	Diagonal matrix index array based on row_ptr
nnz_data	Non-zero value array of the matrix
b	Right-hand-side

This function applies preconditioner matrix into arbitrary input vector b. In other words, solve Px = b.

Definition at line 100 of file precon.c.

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lusgs_prepare()

ucfd_status_t lusgs_prepare	(	int	bn,
		int *	diag_ind,
		double *	nnz_data
	)

LU-SGS preconditioner for BSR matrix format.

Parameters

bn	Number of element cells
blk	Block size of BSR matrix
diag_ind	Diagonal matrix index array based on row_ptr
nnz_data	Non-zero value array of the matrix

LU decomposition is applied in every diagonal matrix.

Definition at line 167 of file precon.c.

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lusgs_psolve()

void lusgs_psolve	(	int	bn,
		int *	row_ptr,
		int *	col_ind,
		int *	diag_ind,
		double *	nnz_data,
		double *	b
	)

Solver function for LU-SGS preconditioner.

Parameters

bn	Number of element cells
blk	Block size of BSR matrix
row_ptr	Row-directional index pointer array of the matrix
col_ind	Column index array of the matrix
diag_ind	Diagonal matrix index array based on row_ptr
nnz_data	Non-zero value array of the matrix
b	Right-hand-side

This function applies preconditioner matrix into arbitrary input vector b. In other words, solve Px = b.

Definition at line 187 of file precon.c.

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none_psolve()

void none_psolve	(	int	bn,
		int *	row_ptr,
		int *	col_ind,
		int *	diag_ind,
		double *	nnz_data,
		double *	b
	)

Unpreconditioned solver.

Definition at line 255 of file precon.c.

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