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/* JimMatMulMPI.c */
#include "../BridgeMPI.h"
#define MYDEBUG 1
#if MYDEBUG > 0
static int count_JimMatMul = 0 ;
static double time_JimMatMul = 0.0 ;
#endif
/*--------------------------------------------------------------------*/
/*
-------------------------------------------------------------
purpose --- to compute a matrix-vector multiply y[] = C * x[]
where C is the identity, A or B (depending on *pprbtype).
*pnrows -- # of rows in x[]
*pncols -- # of columns in x[]
*pprbtype -- problem type
*pprbtype = 1 --> vibration problem, matrix is A
*pprbtype = 2 --> buckling problem, matrix is B
*pprbtype = 3 --> matrix is identity, y[] = x[]
x[] -- vector to be multiplied
NOTE: the x[] vector is global, not a portion
y[] -- product vector
NOTE: the y[] vector is global, not a portion
created -- 98aug28, cca & jcp
-------------------------------------------------------------
*/
void
JimMatMulMPI (
int *pnrows,
int *pncols,
double x[],
double y[],
int *pprbtype,
void *data
) {
BridgeMPI *bridge = (BridgeMPI *) data ;
int ncols, nent, nrows ;
#if MYDEBUG > 0
double t1, t2 ;
count_JimMatMul++ ;
MARKTIME(t1) ;
if ( bridge->myid == 0 ) {
fprintf(stdout, "\n (%d) JimMatMulMPI() start", count_JimMatMul) ;
fflush(stdout) ;
}
#endif
#if MYDEBUG > 1
fprintf(bridge->msgFile,
"\n (%d) JimMatMulMPI() start", count_JimMatMul) ;
fflush(bridge->msgFile) ;
#endif
nrows = *pnrows ;
ncols = *pncols ;
nent = nrows*ncols ;
if ( *pprbtype == 3 ) {
/*
--------------------------
... matrix is the identity
--------------------------
*/
DVcopy(nent, y, x) ;
} else {
BridgeMPI *bridge = (BridgeMPI *) data ;
DenseMtx *mtx, *newmtx ;
int irow, jcol, jj, kk, myid, neqns, nowned, tag = 0 ;
int *vtxmap ;
int stats[4] ;
IV *mapIV ;
/*
---------------------------------------------
slide the owned rows of x[] 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 ) {
y[kk++] = x[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 > 2 ) {
fprintf(bridge->msgFile,
"\n inside JimMatMulMPI, calling MatMulMpi"
"\n prbtype %d, nrows %d, ncols %d, nowned %d",
*pprbtype, *pnrows, *pncols, nowned) ;
fflush(bridge->msgFile) ;
}
MatMulMPI(&nowned, pncols, y, y, pprbtype, data) ;
/*
-------------------------------------------------
gather all the entries of y[] onto processor zero
-------------------------------------------------
*/
mtx = DenseMtx_new() ;
DenseMtx_init(mtx, SPOOLES_REAL, 0, 0, nowned, ncols, 1, nowned) ;
DVcopy (nowned*ncols, DenseMtx_entries(mtx), y) ;
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 > 2 ) {
fprintf(bridge->msgFile, "\n mtx: %d rows x %d columns",
mtx->nrow, mtx->ncol) ;
fflush(bridge->msgFile) ;
}
newmtx = DenseMtx_MPI_splitByRows(mtx, mapIV, stats, bridge->msglvl,
bridge->msgFile, tag, bridge->comm) ;
if ( bridge->msglvl > 2 ) {
fprintf(bridge->msgFile, "\n newmtx: %d rows x %d columns",
newmtx->nrow, newmtx->ncol) ;
fflush(bridge->msgFile) ;
}
DenseMtx_free(mtx) ;
mtx = newmtx ;
IV_free(mapIV) ;
if ( myid == 0 ) {
if ( mtx->nrow != neqns || mtx->ncol != ncols ) {
fprintf(bridge->msgFile,
"\n\n WHOA: mtx->nrows %d, mtx->ncols %d"
", neqns %d, ncols %d", mtx->nrow, mtx->ncol,
neqns, ncols) ;
exit(-1) ;
}
DVcopy(neqns*ncols, y, DenseMtx_entries(mtx)) ;
}
DenseMtx_free(mtx) ;
/*
---------------------------------------------
broadcast the entries to the other processors
---------------------------------------------
*/
MPI_Bcast((void *) y, neqns*ncols, MPI_DOUBLE, 0, bridge->comm) ;
if ( bridge->msglvl > 2 ) {
fprintf(bridge->msgFile, "\n after the broadcast") ;
fflush(bridge->msgFile) ;
}
}
MPI_Barrier(bridge->comm) ;
#if MYDEBUG > 0
MARKTIME(t2) ;
time_JimMatMul += t2 - t1 ;
if ( bridge->myid == 0 ) {
fprintf(stdout, "\n (%d) JimMatMulMPI() end", count_JimMatMul) ;
fprintf(stdout, ", %8.3f seconds, %8.3f total time",
t2 - t1, time_JimMatMul) ;
fflush(stdout) ;
}
#endif
#if MYDEBUG > 1
fprintf(bridge->msgFile,
"\n (%d) JimMatMulMPI() end", count_JimMatMul) ;
fprintf(bridge->msgFile, ", %8.3f seconds, %8.3f total time",
t2 - t1, time_JimMatMul) ;
fflush(bridge->msgFile) ;
#endif
return ; }
/*--------------------------------------------------------------------*/
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