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/* SolveMPI.c */
#include "../BridgeMPI.h"
#define MYDEBUG 1
#if MYDEBUG > 0
static int count_Solve = 0 ;
static double time_Solve = 0.0 ;
#endif
/*--------------------------------------------------------------------*/
/*
----------------------------------------------
purpose -- to solve a linear system
(A - sigma*B) sol[] = rhs[]
data -- pointer to bridge data object
*pnrows -- # of rows in x[] and y[]
*pncols -- # of columns in x[] and y[]
rhs[] -- vector that holds right hand sides
sol[] -- vector to hold solutions
note: rhs[] and sol[] can be the same array.
on return, *perror holds an error code.
1 -- normal return
-1 -- pnrows is NULL
-2 -- pncols is NULL
-3 -- rhs is NULL
-4 -- sol is NULL
-5 -- data is NULL
created -- 98aug10, cca & jcp
----------------------------------------------
*/
void
SolveMPI (
int *pnrows,
int *pncols,
double rhs[],
double sol[],
void *data,
int *perror
) {
BridgeMPI *bridge = (BridgeMPI *) data ;
DenseMtx *rhsmtx ;
double cpus[20] ;
int nent, ncols, nrows, tag = 0 ;
int stats[8] ;
#if MYDEBUG > 0
double t1, t2 ;
count_Solve++ ;
MARKTIME(t1) ;
if ( bridge->myid == 0 ) {
fprintf(stdout, "\n (%d) SolveMPI()", count_Solve) ;
fflush(stdout) ;
}
#endif
#if MYDEBUG > 1
fprintf(bridge->msgFile, "\n (%d) SolveMPI()", count_Solve) ;
fflush(bridge->msgFile) ;
#endif
/*
---------------
check the input
---------------
*/
if ( perror == NULL ) {
fprintf(stderr, "\n error in Solve()"
"\n perror == NULL\n") ;
return ;
}
if ( pnrows == NULL ) {
fprintf(stderr, "\n error in Solve()"
"\n pnrows == NULL\n") ;
*perror = -1 ; return ;
}
if ( pncols == NULL ) {
fprintf(stderr, "\n error in Solve()"
"\n pncols == NULL\n") ;
*perror = -2 ; return ;
}
if ( rhs == NULL ) {
fprintf(stderr, "\n error in Solve()"
"\n rhs == NULL\n") ;
*perror = -3 ; return ;
}
if ( sol == NULL ) {
fprintf(stderr, "\n error in Solve()"
"\n sol == NULL\n") ;
*perror = -4 ; return ;
}
if ( data == NULL ) {
fprintf(stderr, "\n error in Solve()"
"\n data == NULL\n") ;
*perror = -5 ; return ;
}
/*
----------------------------------
set the number of rows and columns
----------------------------------
*/
nrows = *pnrows ;
ncols = *pncols ;
nent = nrows*ncols ;
/*
---------------------------------
setup rhsmtx as a DenseMtx object
---------------------------------
*/
rhsmtx = DenseMtx_new() ;
DenseMtx_init(rhsmtx, SPOOLES_REAL, 0, 0, nrows, ncols, 1, nrows) ;
if ( rhs == NULL ) {
fprintf(stderr, "\n fatal error in SolveMPI, rhsmtx <-- rhs, rhs is NULL") ;
exit(-1) ;
}
if ( DenseMtx_entries(rhsmtx) == NULL ) {
fprintf(stderr,
"\n fatal error in SolveMPI, rhsmtx <-- rhs, rhsmtx is NULL") ;
exit(-1) ;
}
DVcopy (nent, DenseMtx_entries(rhsmtx), rhs) ;
IVcopy(nrows, rhsmtx->rowind, IV_entries(bridge->myownedIV)) ;
if ( bridge->msglvl > 2 && bridge->msgFile != NULL ) {
fprintf(bridge->msgFile, "\n\n rhsmtx initialized") ;
DenseMtx_writeForHumanEye(rhsmtx, bridge->msgFile) ;
fflush(bridge->msgFile) ;
}
if ( bridge->rowmapIV != NULL ) {
DenseMtx *newmtx ;
/*
--------------------------------
pivoting may have taken place,
redistribute the rows of the rhs
--------------------------------
*/
IVzero(4, stats) ;
newmtx = DenseMtx_MPI_splitByRows(rhsmtx, bridge->rowmapIV, stats,
bridge->msglvl, bridge->msgFile, tag, bridge->comm) ;
DenseMtx_free(rhsmtx) ;
rhsmtx = newmtx ;
if ( bridge->msglvl > 2 && bridge->msgFile != NULL ) {
fprintf(bridge->msgFile, "\n\n rhsmtx after redistribution") ;
DenseMtx_writeForHumanEye(rhsmtx, bridge->msgFile) ;
fflush(bridge->msgFile) ;
}
}
/*
-----------------------
solve the linear system
-----------------------
*/
IVzero(8, stats) ;
DVzero(20, cpus) ;
FrontMtx_MPI_solve(bridge->frontmtx, rhsmtx, rhsmtx, bridge->mtxmanager,
bridge->solvemap, cpus, stats, bridge->msglvl,
bridge->msgFile, tag, bridge->comm) ;
if ( bridge->msglvl > 2 && bridge->msgFile != NULL ) {
fprintf(bridge->msgFile,
"\n\n solution matrix after redistribution") ;
DenseMtx_writeForHumanEye(rhsmtx, bridge->msgFile) ;
fflush(bridge->msgFile) ;
}
if ( bridge->rowmapIV != NULL ) {
DenseMtx *newmtx ;
/*
-------------------------------------
pivoting may have taken place,
redistribute the rows of the solution
-------------------------------------
*/
newmtx = DenseMtx_MPI_splitByRows(rhsmtx, bridge->vtxmapIV, stats,
bridge->msglvl, bridge->msgFile, tag, bridge->comm) ;
DenseMtx_free(rhsmtx) ;
rhsmtx = newmtx ;
if ( bridge->msglvl > 2 && bridge->msgFile != NULL ) {
fprintf(bridge->msgFile,
"\n\n solution matrix after redistribution") ;
DenseMtx_writeForHumanEye(rhsmtx, bridge->msgFile) ;
fflush(bridge->msgFile) ;
}
}
/*
-----------------------------------
copy solution into output parameter
-----------------------------------
*/
if ( DenseMtx_entries(rhsmtx) == NULL ) {
fprintf(stderr,
"\n fatal error in SolveMPI, sol <-- rhsmtx, rhsmtx is NULL") ;
exit(-1) ;
}
if ( sol == NULL ) {
fprintf(stderr, "\n fatal error in SolveMPI, sol <-- rhsmtx, sol is NULL") ;
exit(-1) ;
}
DVcopy(nent, sol, DenseMtx_entries(rhsmtx)) ;
/*
------------------------
free the working storage
------------------------
*/
DenseMtx_free(rhsmtx) ;
/*
------------------------------------------------------------------
set the error. (this is simple since when the spooles codes detect
a fatal error, they print out a message to stderr and exit.)
------------------------------------------------------------------
*/
*perror = 0 ;
#if MYDEBUG > 0
MARKTIME(t2) ;
time_Solve += t2 - t1 ;
if ( bridge->myid == 0 ) {
fprintf(stdout, ", %8.3f seconds, %8.3f total time",
t2 - t1, time_Solve) ;
fflush(stdout) ;
}
#endif
#if MYDEBUG > 1
fprintf(bridge->msgFile, ", %8.3f seconds, %8.3f total time",
t2 - t1, time_Solve) ;
fflush(bridge->msgFile) ;
#endif
return ; }
/*--------------------------------------------------------------------*/
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