openMP is not creating threads in visual studio

Question

My openMP version did not give any speed boost. I have a dual core machine and the CPU usage is always 50%. So I tried the sample program given in Wiki. Looks like the openM

Answer 1

Why would you need more than one thread for that program? It's clearly the case that OpenMP realizes that it doesn't need to create an extra thread to run a program with no loops, no code that could run in parallel whatsoever.

Try running some parallel stuff with OpenMP. Something like this:

#include 
#include 
#include 
#define CHUNKSIZE   10
#define N       100

int main (int argc, char *argv[]) 
{
int nthreads, tid, i, chunk;
float a[N], b[N], c[N];

/* Some initializations */
for (i=0; i < N; i++)
  a[i] = b[i] = i * 1.0;
chunk = CHUNKSIZE;

#pragma omp parallel shared(a,b,c,nthreads,chunk) private(i,tid)
  {
  tid = omp_get_thread_num();
  if (tid == 0)
    {
    nthreads = omp_get_num_threads();
    printf("Number of threads = %d\n", nthreads);
    }
  printf("Thread %d starting...\n",tid);

  #pragma omp for schedule(dynamic,chunk)
  for (i=0; i

If you want some hard core stuff, try running one of these.