pdgstrs_Bglobal_Bsend.c File Reference

Solves a system of distributed linear equations. More...

#include "superlu_ddefs.h"

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Macros
#define	BSEND   1

Functions
void	pdgstrs_Bglobal (int_t n, LUstruct_t *LUstruct, gridinfo_t *grid, double *B, int_t ldb, int nrhs, SuperLUStat_t *stat, int *info)
static void	gather_diag_to_all (int_t n, int_t nrhs, double x[], Glu_persist_t *Glu_persist, LocalLU_t *Llu, gridinfo_t *grid, int_t num_diag_procs, int_t diag_procs[], int_t diag_len[], double y[], int_t ldy, double work[])

Detailed Description

Solves a system of distributed linear equations.

Copyright (c) 2003, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from U.S. Dept. of Energy)

All rights reserved.

The source code is distributed under BSD license, see the file License.txt at the top-level directory.

-- Distributed SuperLU routine (version 1.0) --
Lawrence Berkeley National Lab, Univ. of California Berkeley.
September 1, 1999

Modified:
    Feburary 7, 2001    use MPI_Isend/MPI_Irecv
    October 2, 2001     use MPI_Isend/MPI_Irecv with MPI_Test

Macro Definition Documentation

BSEND

#define BSEND   1

Function Documentation

gather_diag_to_all()

static void gather_diag_to_all ( int_t  n, int_t  nrhs, double  x[], Glu_persist_t *  Glu_persist, LocalLU_t *  Llu, gridinfo_t *  grid, int_t  num_diag_procs, int_t  diag_procs[], int_t  diag_len[], double  y[], int_t  ldy, double  work[]  )

static

Gather the components of x vector on the diagonal processes
onto all processes, and combine them into the global vector y.

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pdgstrs_Bglobal()

void pdgstrs_Bglobal	(	int_t	n,
		LUstruct_t *	LUstruct,
		gridinfo_t *	grid,
		double *	B,
		int_t	ldb,
		int	nrhs,
		SuperLUStat_t *	stat,
		int *	info
	)

Purpose
=======

pdgstrs_Bglobal solves a system of distributed linear equations
A*X = B with a general N-by-N matrix A using the LU factorization
computed by pdgstrf.

Arguments
=========

n      (input) int (global)
       The order of the system of linear equations.

LUstruct (input) LUstruct_t*
       The distributed data structures storing L and U factors.
       The L and U factors are obtained from pdgstrf for
       the possibly scaled and permuted matrix A.
       See superlu_ddefs.h for the definition of 'LUstruct_t'.

grid   (input) gridinfo_t*
       The 2D process mesh. It contains the MPI communicator, the number
       of process rows (NPROW), the number of process columns (NPCOL),
       and my process rank. It is an input argument to all the
       parallel routines.
       Grid can be initialized by subroutine SUPERLU_GRIDINIT.
       See superlu_ddefs.h for the definition of 'gridinfo_t'.

B      (input/output) double*
       On entry, the right-hand side matrix of the possibly equilibrated
       and row permuted system.
       On exit, the solution matrix of the possibly equilibrated
       and row permuted system if info = 0;

       NOTE: Currently, the N-by-NRHS  matrix B must reside on all 
             processes when calling this routine.

ldb    (input) int (global)
       Leading dimension of matrix B.

nrhs   (input) int (global)
       Number of right-hand sides.

stat   (output) SuperLUStat_t*
       Record the statistics about the triangular solves.
       See util.h for the definition of 'SuperLUStat_t'.

info   (output) int*
       = 0: successful exit
    < 0: if info = -i, the i-th argument had an illegal value

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