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/* solve.c */
#include "../BridgeMPI.h"
/*--------------------------------------------------------------------*/
/*
--------------------------------------------
purpose -- to solve the linear system
MPI version
if permuteflag is 1 then
rhs is permuted into new ordering
solution is permuted into old ordering
return value ---
1 -- normal return
-1 -- bridge is NULL
-2 -- X is NULL
-3 -- Y is NULL
-4 -- frontmtx is NULL
-5 -- mtxmanager is NULL
-6 -- oldToNewIV not available
-7 -- newToOldIV not available
created -- 98sep18, cca
--------------------------------------------
*/
int
BridgeMPI_solve (
BridgeMPI *bridge,
int permuteflag,
DenseMtx *X,
DenseMtx *Y
) {
DenseMtx *Xloc, *Yloc ;
double cputotal, t0, t1, t2 ;
double cpus[6] ;
FILE *msgFile ;
FrontMtx *frontmtx ;
int firsttag, msglvl, myid, nmycol, nrhs, nrow ;
int *mycolind, *rowind ;
int stats[4] ;
IV *mapIV, *ownersIV ;
MPI_Comm comm ;
SubMtxManager *mtxmanager ;
/*
---------------
check the input
---------------
*/
MARKTIME(t0) ;
if ( bridge == NULL ) {
fprintf(stderr, "\n error in BridgeMPI_solve"
"\n bridge is NULL\n") ;
return(-1) ;
}
if ( (frontmtx = bridge->frontmtx) == NULL ) {
fprintf(stderr, "\n error in BridgeMPI_solve"
"\n frontmtx is NULL\n") ;
return(-4) ;
}
if ( (mtxmanager = bridge->mtxmanager) == NULL ) {
fprintf(stderr, "\n error in BridgeMPI_solve"
"\n mtxmanager is NULL\n") ;
return(-5) ;
}
myid = bridge->myid ;
comm = bridge->comm ;
msglvl = bridge->msglvl ;
msgFile = bridge->msgFile ;
frontmtx = bridge->frontmtx ;
ownersIV = bridge->ownersIV ;
Xloc = bridge->Xloc ;
Yloc = bridge->Yloc ;
if ( myid != 0 ) {
X = Y = NULL ;
} else {
if ( X == NULL ) {
fprintf(stderr, "\n error in BridgeMPI_solve"
"\n myid 0, X is NULL\n") ;
return(-2) ;
}
if ( Y == NULL ) {
fprintf(stderr, "\n error in BridgeMPI_solve"
"\n myid 0, Y is NULL\n") ;
return(-3) ;
}
}
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n inside BridgeMPI_solve()") ;
fflush(msgFile) ;
}
if ( msglvl > 2 ) {
fprintf(msgFile , "\n\n Xloc") ;
DenseMtx_writeForHumanEye(Xloc, msgFile) ;
fprintf(msgFile , "\n\n Yloc") ;
DenseMtx_writeForHumanEye(Yloc, msgFile) ;
fflush(msgFile) ;
}
/*--------------------------------------------------------------------*/
if ( myid == 0 ) {
/*
--------------------------
optionally permute the rhs
--------------------------
*/
if ( permuteflag == 1 ) {
int rc ;
IV *oldToNewIV ;
MARKTIME(t1) ;
rc = BridgeMPI_oldToNewIV(bridge, &oldToNewIV) ;
if (rc != 1) {
fprintf(stderr, "\n error in BridgeMPI_solve()"
"\n rc = %d from BridgeMPI_oldToNewIV()\n", rc) ;
return(-6) ;
}
DenseMtx_permuteRows(Y, oldToNewIV) ;
MARKTIME(t2) ;
bridge->cpus[15] += t2 - t1 ;
if ( msglvl > 2 ) {
fprintf(msgFile , "\n\n permuted Y") ;
DenseMtx_writeForHumanEye(Y, msgFile) ;
fflush(msgFile) ;
}
}
}
/*--------------------------------------------------------------------*/
/*
-------------------------------------
distribute the right hand side matrix
-------------------------------------
*/
MARKTIME(t1) ;
mapIV = bridge->rowmapIV ;
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n row map IV object") ;
IV_writeForHumanEye(mapIV, msgFile) ;
fflush(msgFile) ;
}
if ( myid == 0 ) {
nrhs = Y->ncol ;
} else {
nrhs = 0 ;
}
MPI_Bcast((void *) &nrhs, 1, MPI_INT, 0, comm) ;
firsttag = 0 ;
IVfill(4, stats, 0) ;
DenseMtx_MPI_splitFromGlobalByRows(Y, Yloc, mapIV, 0, stats,
msglvl, msgFile, firsttag, comm) ;
MARKTIME(t2) ;
bridge->cpus[16] += t2 - t1 ;
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n local matrix Y after the split") ;
DenseMtx_writeForHumanEye(Yloc, msgFile) ;
fflush(msgFile) ;
}
/*--------------------------------------------------------------------*/
/*
--------------------------------------
initialize the local solution X object
--------------------------------------
*/
MARKTIME(t1) ;
IV_sizeAndEntries(bridge->ownedColumnsIV, &nmycol, &mycolind) ;
DenseMtx_init(Xloc, bridge->type, -1, -1, nmycol, nrhs, 1, nmycol) ;
if ( nmycol > 0 ) {
DenseMtx_rowIndices(Xloc, &nrow, &rowind) ;
IVcopy(nmycol, rowind, mycolind) ;
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n local matrix X") ;
DenseMtx_writeForHumanEye(Xloc, msgFile) ;
fflush(msgFile) ;
}
}
MARKTIME(t2) ;
bridge->cpus[17] += t2 - t1 ;
/*--------------------------------------------------------------------*/
/*
----------------
solve the system
----------------
*/
MARKTIME(t1) ;
DVzero(6, cpus) ;
FrontMtx_MPI_solve(frontmtx, Xloc, Yloc, mtxmanager, bridge->solvemap,
cpus, stats, msglvl, msgFile, firsttag, comm) ;
MARKTIME(t2) ;
bridge->cpus[18] += t2 - t1 ;
if ( msglvl > 1 ) {
fprintf(msgFile, "\n\n CPU %8.3f : solve the system", t2 - t1) ;
}
cputotal = t2 - t1 ;
if ( cputotal > 0.0 ) {
fprintf(msgFile,
"\n set up solves %8.3f %6.2f"
"\n load rhs and store solution %8.3f %6.2f"
"\n forward solve %8.3f %6.2f"
"\n diagonal solve %8.3f %6.2f"
"\n backward solve %8.3f %6.2f"
"\n total time %8.3f",
cpus[0], 100.*cpus[0]/cputotal,
cpus[1], 100.*cpus[1]/cputotal,
cpus[2], 100.*cpus[2]/cputotal,
cpus[3], 100.*cpus[3]/cputotal,
cpus[4], 100.*cpus[4]/cputotal, cputotal) ;
}
if ( msglvl > 3 ) {
fprintf(msgFile, "\n\n computed solution") ;
DenseMtx_writeForHumanEye(Xloc, msgFile) ;
fflush(stdout) ;
}
/*--------------------------------------------------------------------*/
/*
-------------------------------------
gather the solution on processor zero
-------------------------------------
*/
MARKTIME(t1) ;
DenseMtx_MPI_mergeToGlobalByRows(X, Xloc, 0, stats, msglvl, msgFile,
firsttag, comm) ;
MARKTIME(t2) ;
bridge->cpus[19] += t2 - t1 ;
if ( myid == 0 ) {
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n global matrix X in new ordering") ;
DenseMtx_writeForHumanEye(X, msgFile) ;
fflush(msgFile) ;
}
}
/*--------------------------------------------------------------------*/
/*
-------------------------------
optionally permute the solution
-------------------------------
*/
if ( myid == 0 ) {
if ( permuteflag == 1 ) {
int rc ;
IV *newToOldIV ;
rc = BridgeMPI_newToOldIV(bridge, &newToOldIV) ;
if (rc != 1) {
fprintf(stderr, "\n error in BridgeMPI_solve()"
"\n rc = %d from BridgeMPI_newToOldIV()\n", rc) ;
return(-7) ;
}
DenseMtx_permuteRows(X, newToOldIV) ;
}
MARKTIME(t2) ;
bridge->cpus[20] += t2 - t1 ;
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n global matrix X in old ordering") ;
DenseMtx_writeForHumanEye(X, msgFile) ;
fflush(msgFile) ;
}
}
MARKTIME(t2) ;
bridge->cpus[21] += t2 - t0 ;
return(1) ; }
/*--------------------------------------------------------------------*/
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