acctest.cc

#include <stdio.h>
#include <time.h>
#include <stdlib.h>

const int N=10000000;
double a[N],b[N],c[N],d[N];

double 
myrand(void){
  return (double)rand()/((double)RAND_MAX+1.0);
}

int
main(void){
  for(int i=0;i<N;i++){
    a[i] = myrand();
    b[i] = myrand();
    c[i] = myrand();
    d[i] = 0.0;
  }
  clock_t t1 = clock();
#pragma acc kernels
  for(int j=0;j<100;j++){
    for(int i=0;i<N;i++){
      d[i] = a[i] * b[i] + c[i];
    }
  }
  clock_t t2 = clock();
  printf("%d\n",t2-t1);
}