More than one thread in Openmp

Question

Hello Friends,
I am trying to paralelize a great c program and now I am having problems for getting more than one thread.
I tried it inside my code, at first I put omp_set_dynamic(0) and after I put omp_set_num_threads(4), but I got only one thread.
These functions worked fine with a simple hello world code and I got to run 4 threads, but in my big code they didn't work. Could anybody help me? Any hint would be very good!...
Regards,
Glauber

Answer 1

Hi,
Thanks, It's a big code and was divided in 9 files, even so, I will post its most important parts.
That functions are called from sequential part before the parallel region as you will can see below:
// global.h
#if defined (OMP_ENABLED)
#     include "omp.h"
#endif
// main.c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <string.h>
#include <stdarg.h>
#include "global.h"
#ifdef USE_READLINE
# include <readline/readline.h>
# include <readline/history.h>
static char **readline_completion(const char *, int, int);
#endif
# if defined (OMP_ENABLED)
int           proc_id; /* process ID (0, 1, ..., num_procs-1) */
int           num_procs; /* number of active processors */
# endif
int main (int argc, char *argv[])
     int i;
# if defined (OMP_ENABLED)
omp_set_dynamic(0);
omp_set_num_threads(4);
num_procs = omp_get_num_threads();
printf("Num procs: %i\n",num_procs);
if( num_procs <= 1)
exit(0);
# endif
//mcmc.c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stdarg.h>
#include "global.h"
int RunChain (long int *seed)
     int          i, j, k, n, chn, stopChain;
     for (chn=0; chn<numLocalChains; chn++)
#if defined (OMP_ENABLED)
#pragma omp parallel for private(chn)
#endif
          for (chn=0; chn<numLocalChains; chn++)
If you need something else, please, return me
Thanks in advanced
Glauber