//obliczanie PI
long long num_steps = 10000000;
double step;
double tab[100]; // zapisanie w pamieci nowej wartosci, a nie w rejestrze
int main(int argc, char* argv[])
{
clock_t start, stop;
for (int j = 0; j < 20; j++)
{
double x, pi, sum = 0.0;
int i;
step = 1. / (double)num_steps;
start = clock();
omp_set_num_threads(2);
#pragma omp parallel
{
int id = omp_get_thread_num();
tab[id + j] = 0;
#pragma omp for
for (i = 0; i < num_steps; i++)
{
double x = (i + .5)*step;
tab[j + id] += 4.0 / (1. + x*x);
}
#pragma omp atomic
sum += tab[j + id];
}
pi = sum*step;
stop = clock();
printf("Czas przetwarzania %d wynosi %f sekund\n",j, ((double)(stop - start) / 1000.0));
}
return 0;
}
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