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/* JimSolveMPI.c */
#include "../BridgeMPI.h"
#define MYDEBUG 1
#if MYDEBUG > 0
static int count_JimSolve = 0 ;
static double time_JimSolve = 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
NOTE: the rhs[] vector is global, not a portion
sol[] -- vector to hold solutions
NOTE: the sol[] vector is global, not a portion
note: rhs[] and sol[] can be the same array.
on return, *perror holds an error code.
created -- 98aug28, cca & jcp
--------------------------------------------------
*/
void
JimSolveMPI (
int *pnrows,
int *pncols,
double rhs[],
double sol[],
void *data,
int *perror
) {
BridgeMPI *bridge = (BridgeMPI *) data ;
DenseMtx *mtx, *newmtx ;
int irow, jj, jcol, kk, myid, ncols = *pncols,
neqns, nowned, tag = 0 ;
int *vtxmap ;
int stats[4] ;
IV *mapIV ;
#if MYDEBUG > 0
double t1, t2 ;
count_JimSolve++ ;
MARKTIME(t1) ;
if ( bridge->myid == 0 ) {
fprintf(stdout, "\n (%d) JimSolve() start", count_JimSolve) ;
fflush(stdout) ;
}
#endif
#if MYDEBUG > 1
fprintf(bridge->msgFile, "\n (%d) JimSolve() start", count_JimSolve) ;
fflush(bridge->msgFile) ;
#endif
MPI_Barrier(bridge->comm) ;
/*
---------------------------------------------
slide the owned rows of rhs down in the array
---------------------------------------------
*/
vtxmap = IV_entries(bridge->vtxmapIV) ;
neqns = bridge->neqns ;
myid = bridge->myid ;
nowned = IV_size(bridge->myownedIV) ;
for ( jcol = jj = kk = 0 ; jcol < ncols ; jcol++ ) {
for ( irow = 0 ; irow < neqns ; irow++, jj++ ) {
if ( vtxmap[irow] == myid ) {
sol[kk++] = rhs[jj] ;
}
}
}
if ( kk != nowned * ncols ) {
fprintf(stderr, "\n proc %d : kk %d, nowned %d, ncols %d",
myid, kk, nowned, ncols) ;
exit(-1) ;
}
/*
----------------------------------------
call the method that assumes local input
----------------------------------------
*/
if ( bridge->msglvl > 1 ) {
fprintf(bridge->msgFile, "\n calling SolveMPI()") ;
fflush(bridge->msgFile) ;
}
SolveMPI(&nowned, pncols, sol, sol, data, perror) ;
if ( bridge->msglvl > 1 ) {
fprintf(bridge->msgFile, "\n return from SolveMPI()") ;
fflush(bridge->msgFile) ;
}
/*
------------------------------------------
gather all the entries onto processor zero
------------------------------------------
*/
mtx = DenseMtx_new() ;
DenseMtx_init(mtx, SPOOLES_REAL, 0, 0, nowned, ncols, 1, nowned) ;
DVcopy (nowned*ncols, DenseMtx_entries(mtx), sol) ;
IVcopy(nowned, mtx->rowind, IV_entries(bridge->myownedIV)) ;
mapIV = IV_new() ;
IV_init(mapIV, neqns, NULL) ;
IV_fill(mapIV, 0) ;
IVfill(4, stats, 0) ;
if ( bridge->msglvl > 1 ) {
fprintf(bridge->msgFile, "\n calling DenseMtx_split()()") ;
fflush(bridge->msgFile) ;
}
newmtx = DenseMtx_MPI_splitByRows(mtx, mapIV, stats, bridge->msglvl,
bridge->msgFile, tag, bridge->comm) ;
if ( bridge->msglvl > 1 ) {
fprintf(bridge->msgFile, "\n return from DenseMtx_split()()") ;
fflush(bridge->msgFile) ;
}
DenseMtx_free(mtx) ;
mtx = newmtx ;
IV_free(mapIV) ;
if ( myid == 0 ) {
DVcopy(neqns*ncols, sol, DenseMtx_entries(mtx)) ;
}
DenseMtx_free(mtx) ;
/*
---------------------------------------------
broadcast the entries to the other processors
---------------------------------------------
*/
if ( bridge->msglvl > 1 ) {
fprintf(bridge->msgFile, "\n calling MPI_Bcast()()") ;
fflush(bridge->msgFile) ;
}
MPI_Bcast((void *) sol, neqns*ncols, MPI_DOUBLE, 0, bridge->comm) ;
if ( bridge->msglvl > 1 ) {
fprintf(bridge->msgFile, "\n return from MPI_Bcast()()") ;
fflush(bridge->msgFile) ;
}
MPI_Barrier(bridge->comm) ;
/*
------------------------------------------------------------------
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_JimSolve += t2 - t1 ;
if ( bridge->myid == 0 ) {
fprintf(stdout, "\n (%d) JimSolve() end", count_JimSolve) ;
fprintf(stdout, ", %8.3f seconds, %8.3f total time",
t2 - t1, time_JimSolve) ;
fflush(stdout) ;
}
#endif
#if MYDEBUG > 1
fprintf(bridge->msgFile, "\n (%d) JimSolve() end", count_JimSolve) ;
fprintf(bridge->msgFile, ", %8.3f seconds, %8.3f total time",
t2 - t1, time_JimSolve) ;
fflush(bridge->msgFile) ;
#endif
return ; }
/*--------------------------------------------------------------------*/
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