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#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include "mp3.h"
#include "armci.h"
#define PRINT_VEC_
int na,nz;
double *bvec,*dvec,*svec,*dmvec,*m_dvec,*amat,*xvec,*axvec,*rvec,*qvec;
int *ridx,*cidx;
int me, nproc;
int myfirstrow=0,mylastrow=0;
double epsilon=1e-4;
double time_get=0;
static int niter;
void read_and_create(int,char **);
void computeminverser(double *,double *, double *);
void computeminverse(double *,double *, int *,int *);
void finalize_arrays();
extern void acg_matvecmul(double *,double *,double *,int *,int *);
extern void acg_addvec(double *,double *,double *,double *, double *);
extern void acg_2addvec(double *,double *, double *,double *, double *,
double *, double *,double *, double *, double *, int *, int *);
extern double acg_ddot(double *,double *);
void conjugate_gradient(int nit,int dopreconditioning)
{
int i;
double d_one=1.0,d_negone=-1.0;
double delta0=0.0,deltaold=0.0,deltanew=0.0;
double alpha=0.0,negalpha,beta,dtransposeq;
acg_matvecmul(amat,xvec,axvec,ridx,cidx); /* compute Ax */
#ifdef PRINT_VEC
acg_printvec("axvec",axvec);
acg_printvec("bvec",bvec);
#endif
/* TODO original call had too many arguments */
/* acg_addvec(&d_one,bvec,&d_negone,axvec,rvec,ridx,cidx); */ /* r=b-Ax */
acg_addvec(&d_one,bvec,&d_negone,axvec,rvec); /* r=b-Ax */
#ifdef PRINT_VEC
acg_printvec("rvec",rvec);
if(me==0)for(i=0;i<nz;i++)printf("\n%d:col[%d]=%d",me,i,cidx[i]);
fflush(stdout);
#endif
if(dopreconditioning){
computeminverse(dmvec,amat,ridx,cidx);
/*acg_printvec("dmvec",dmvec);*/
computeminverser(dmvec,rvec,dvec);
/*acg_printvec("dvec",dvec);*/
if (me == 0)
printf("\nDoing preconditioning!\n");
}
else{
if(me==0)memcpy(dvec,rvec,na*sizeof(double));
}
if(dopreconditioning)
deltanew = acg_ddot(rvec,dvec); /* deltanew = r.r_tranpose */
else
deltanew = acg_ddot(rvec,rvec); /* deltanew = r.r_tranpose */
delta0 = deltanew; /* delta0 = deltanew */
if(me==0)printf("\n\tdelta0 is %f\n",delta0);
for(i=0;i<nit && deltanew>(epsilon*epsilon*delta0);i++){
acg_matvecmul(amat,dvec,qvec,ridx,cidx); /* q = ad */
dtransposeq=acg_ddot(dvec,qvec); /* compute d_transpose.q */
alpha = deltanew/dtransposeq; /* deltanew/(d_transpose.q) */
#if 0
if(i>0 && i%50==0){
/* compute Ax*/
acg_matvecmul(amat,xvec,axvec,ridx,cidx);
/* x = x+ alpha.d*/ /* r=b-Ax*/
acg_2addvec(&d_one,xvec,&alpha,dvec,xvec,&d_one,bvec,
&d_negone,axvec,rvec,ridx,cidx);
}
else
#endif
{
negalpha = 0.0-alpha;
/* x = x+ alpha.d*/ /* r=r-alpha.q*/
acg_2addvec(&d_one,xvec,&alpha,dvec,xvec,&d_one,rvec,
&negalpha,qvec,rvec,ridx,cidx);
}
if(dopreconditioning)
computeminverser(dmvec,rvec,svec);
deltaold = deltanew; /* deltaold = deltanew*/
if(dopreconditioning)
deltanew = acg_ddot(svec,rvec); /* deltanew = r_transpose.r*/
else
deltanew = acg_ddot(rvec,rvec); /* deltanew = r_transpose.r*/
beta = deltanew/deltaold; /* beta = deltanew/deltaold*/
if(dopreconditioning) {
/* too many aguments in function call */
/* acg_addvec(&d_one,svec,&beta,dvec,dvec,ridx,cidx); */
/* d = s + beta.d */
acg_addvec(&d_one,svec,&beta,dvec,dvec);
} else {
/* too many aguments in function call */
/* acg_addvec(&d_one,rvec,&beta,dvec,dvec,ridx,cidx); */
/* d = r + beta.d */
acg_addvec(&d_one,rvec,&beta,dvec,dvec);
}
#ifdef PRINT_VEC
acg_printvec("xvec",xvec);
#endif
/* acg_printvec("xvec",xvec); */
}
if(me==0)printf("\n\tIteration:%d\tBeta:%0.4f\tDelta:%f\n",
i,beta,deltanew);
niter = i;
}
void initialize_arrays(int dpc)
{
int i;
for(i=0;i<na;i++){
xvec[i]=0.0;
dvec[i]=axvec[i]=rvec[i]=qvec[i]=0;
if(dpc){dmvec[i]=svec[i]=0;}
}
}
void finalize_arrays(int dpc)
{
if(me==0){
ARMCI_Free(bvec);
ARMCI_Free(dvec);
ARMCI_Free(amat);
ARMCI_Free(xvec);
ARMCI_Free(axvec);
ARMCI_Free(rvec);
ARMCI_Free(qvec);
ARMCI_Free(ridx);
ARMCI_Free(cidx);
if(dpc){
ARMCI_Free(svec);
ARMCI_Free(dmvec);
}
}
}
FILE *fd;
int main(int argc, char **argv)
{
int dopreconditioning=1;
double time0,time1;
MP_INIT(argc,argv);
MP_PROCS(&nproc);
MP_MYID(&me);
ARMCI_Init(); /* initialize ARMCI */
if(me==0)printf("\n CONJUGATE GRADIENT EXAMPLE\n");
if(argc<3){
if(me==0){
printf(" CORRECT USAGE IS:");
printf("\n\n <launch commands> cg.x na nz file");
printf("\n\n where:");
printf("\n\tna is array dimention (only square arrays supported)");
printf("\n\tnz is number of non-zeros");
printf("\n\tfile is either the input file or the word random");
printf("\n\t use the word random if you to use random input");
printf("\n\t input should be in row compressed format");
printf("\n\t file should have matrix a followed by row, col & b (Ax=b)");
printf("\n\t if file also has na and nz, pass them as 0's and the");
printf("\n\t program will read them from the file");
printf("\n\nexample usages are:");
printf("\n\tmpirun -np 4 ./ga_cg.x 5000 80000 /home/me/myinput.dat");
printf("\n\tor");
printf("\n\tmpirun -np 4 ./ga_cg.x 5000 80000 random\n\n");
fflush(stdout);
}
ARMCI_Finalize();
MP_FINALIZE();
return 0;
}
read_and_create(argc,argv);
if(me==0)printf("\nWarmup and initialization run");
#if 0
initialize_arrays(dopreconditioning);
conjugate_gradient(1,dopreconditioning);
time_get =0.0;
#endif
if(me==0)printf("\n\nStarting Conjugate Gradient ....");
initialize_arrays(dopreconditioning);
time0=MP_TIMER();
conjugate_gradient(30000/*2*/,dopreconditioning);
time1=MP_TIMER();
acg_matvecmul(amat,xvec,axvec,ridx,cidx);
if(me==0)printf("\n%d:in %d iterations time to solution=%f-%f ax and b in cg_output.out\n",me,niter,(time1-time0),time_get);
acg_matvecmul(amat,xvec,axvec,ridx,cidx);
if(me==0){
int i;
fd = fopen("cg_output.out", "w");
for(i=0;i<=na;i++)
fprintf(fd,"\n%d:%s[%d]=%f %s[%d]=%f",me,"bvec",i,bvec[i],"axvec",i,axvec[i]);
fflush(stdout);
fclose(fd);
}
finalize_arrays(dopreconditioning);
MP_BARRIER();
if(me==0)printf("Terminating ..\n");
ARMCI_Finalize();
MP_FINALIZE();
return 0;
}
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