openmp简单测试

openmp的测试程序

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

int main()
{
	volatile int i;
	volatile int j;
	int sum = 0;
	double t1, t2;
	t1 = clock();
	#pragma omp parallel
	{
	#pragma omp for nowait
	for (i = 0 ; i < 10 ; i++)
	{
		#pragma omp atomic
		sum += 1;
		printf("the sum is %d\n\r", sum);
	}
	#pragma omp for
	for (j = 0 ; j < 10 ; j++)
	{
		printf("hahaha%d\n\r", j);
	}
	}
	t2 = clock();
	printf("the cost time on this demo is %f\r\n", (t2 - t1)/CLOCKS_PER_SEC);
	printf("the sum is %d\n\r", sum);
	return 0;
}