#include "stdio.h"
#include "omp.h"
#define NUM_THREADS 4
int main()
{
int i, k = 100;
omp_set_num_threads(NUM_THREADS);
#pragma omp parallel for firstprivate(k)
for (i = 0; i < 5; i++)
{
k++;
printf("In for-loop k=%d\n", k);
}
printf("k=%d\n", k);
return 0;
}
错误:正确:
为什么同样的代码vscode命令行直接生成exe运行结果不太对,正确的结果使用vs2019运行的
打印一下最大线程数看看
#include "stdio.h"
#include "omp.h"
#define NUM_THREADS 4
int main (int argc, const char * argv[])
{
int i,k=100;
int nProcessors = omp_get_max_threads();
printf("max thread = %d\n",nProcessors);
omp_set_num_threads(nProcessors > NUM_THREADS ? NUM_THREADS:nProcessors);
#pragma omp parallel for firstprivate(k)
for(int i = 0; i < 5; i++)
{
k++;
printf("In for-loop k=%d\n", k);
}
printf("k=%d\n", k);
exit(0);
}
正确的那张图也不太正确K最终还应该为100 而不是105
根据周围人解答,这个代码书上印错了,第十一行for循环里的k++应该改为k+=i输出结果则正确。