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/* factorSetup.c */
#include "../BridgeMT.h"
/*--------------------------------------------------------------------*/
/*
-------------------------------------------------------
purpose -- to construct the map from fronts to threads,
and compute operations for each thread.
nthread -- number of threads
maptype -- type of map for parallel factorization
maptype = 1 --> wrap map
maptype = 2 --> balanced map
maptype = 3 --> subtree-subset map
maptype = 4 --> domain decomposition map
cutoff -- used when maptype = 4 as upper bound on
relative domain size
default is maptype = 4 and cutoff = 1/(2*nthread)
return value --
1 -- success
-1 -- bridge is NULL
-2 -- nthread is invalid, must be > 0
-3 -- front tree is NULL
created -- 98sep24, cca
-------------------------------------------------------
*/
int
BridgeMT_factorSetup (
BridgeMT *bridge,
int nthread,
int maptype,
double cutoff
) {
double t1, t2 ;
DV *cumopsDV ;
ETree *frontETree ;
FILE *msgFile ;
int msglvl ;
/*
---------------
check the input
---------------
*/
MARKTIME(t1) ;
if ( bridge == NULL ) {
fprintf(stderr, "\n error in BridgeMT_factorSetup()"
"\n bridge is NULL") ;
return(-1) ;
}
if ( nthread < 1 ) {
fprintf(stderr, "\n error in BridgeMT_factorSetup()"
"\n nthread = %d, is invalid", nthread) ;
return(-2) ;
}
if ( (frontETree = bridge->frontETree) == NULL ) {
fprintf(stderr, "\n error in BridgeMT_factorSetup()"
"\n frontETree is NULL") ;
return(-5) ;
}
bridge->nthread = nthread ;
/*
-------------------------------------------
allocate and initialize the cumopsDV object
-------------------------------------------
*/
if ( (cumopsDV = bridge->cumopsDV) == NULL ) {
cumopsDV = bridge->cumopsDV = DV_new() ;
}
DV_setSize(cumopsDV, nthread) ;
DV_zero(cumopsDV) ;
/*
----------------------------
create the owners map object
----------------------------
*/
switch ( maptype ) {
case 1 :
bridge->ownersIV = ETree_wrapMap(frontETree, bridge->type,
bridge->symmetryflag, cumopsDV) ;
break ;
case 2 :
bridge->ownersIV = ETree_balancedMap(frontETree, bridge->type,
bridge->symmetryflag, cumopsDV) ;
break ;
case 3 :
bridge->ownersIV = ETree_subtreeSubsetMap(frontETree, bridge->type,
bridge->symmetryflag, cumopsDV) ;
break ;
case 4 :
bridge->ownersIV = ETree_ddMap(frontETree, bridge->type,
bridge->symmetryflag, cumopsDV, cutoff) ;
break ;
default :
bridge->ownersIV = ETree_ddMap(frontETree, bridge->type,
bridge->symmetryflag, cumopsDV, 1./(2*nthread)) ;
break ;
}
MARKTIME(t2) ;
bridge->cpus[5] = t2 - t1 ;
msglvl = bridge->msglvl ;
msgFile = bridge->msgFile ;
if ( msglvl > 1 ) {
fprintf(msgFile, "\n\n parallel factor setup") ;
fprintf(msgFile, "\n type = %d, symmetryflag = %d",
bridge->type, bridge->symmetryflag) ;
fprintf(msgFile, "\n total factor operations = %.0f",
DV_sum(cumopsDV)) ;
fprintf(msgFile,
"\n upper bound on speedup due to load balance = %.2f",
DV_max(cumopsDV)/DV_sum(cumopsDV)) ;
fprintf(msgFile, "\n operations distributions over threads") ;
DV_writeForHumanEye(cumopsDV, msgFile) ;
fflush(msgFile) ;
}
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n owners map IV object") ;
IV_writeForHumanEye(bridge->ownersIV, msgFile) ;
fflush(msgFile) ;
}
return(1) ; }
/*--------------------------------------------------------------------*/
|
