Changed wall clock time calculation

src/impl/omp.c

@@ -36,11 +36,10 @@ double *compute_jacobi(int n, double init_value, double threshold, borders b, in
     }
   }
   /* Iterative refinement of x until values converge */
-  omp_set_num_threads(2);
   *iterations = 0;
   do {
     max_diff = 0;
-    #pragma omp parallel for schedule(static, 20) \
+    #pragma omp parallel for schedule(static) \
       reduction (max:max_diff) \
       default(none) private(new_value, j) firstprivate(n, nb) shared(x, new_x)
     for (i = 1; i <= n; i++) {