In this example (in the slide), int main(int argc, char *argv[]) { printf("Openmp running with %d threads\n", omp_get_max_threads()); #pragma omp parallel { printf("Hello World from thread %d\n", omp_get_thread_num()); } return 0; } I ran this on setonix, but get a result shown below: Openmp running with 1 threads Hello World from thread 0 . . . repeat 28 times... Is it correct? but what I expect is 28 threads, then from thread 1,2,3...