SRC/pdgstrs_Bglobal.c File Reference

Solves a system of distributed linear equations A*X = B with a general N-by-N matrix A using the LU factorization. More...

#include "superlu_ddefs.h"

Defines

#define ISEND_IRECV

Functions

static void gather_diag_to_all (int_t, int_t, double[], Glu_persist_t *, LocalLU_t *, gridinfo_t *, int_t, int_t[], int_t[], double[], int_t, double[])
void pdgstrs_Bglobal (int_t n, LUstruct_t *LUstruct, gridinfo_t *grid, double *B, int_t ldb, int nrhs, SuperLUStat_t *stat, int *info)


Detailed Description

 -- 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
 

Define Documentation

#define ISEND_IRECV
 


Function Documentation

static void gather_diag_to_all int_t  ,
int_t  ,
double  [],
Glu_persist_t ,
LocalLU_t ,
gridinfo_t ,
int_t  ,
int_t  [],
int_t  [],
double  [],
int_t  ,
double  []
[static]
 

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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