Openmp basic Parallelization?

I am surprised that you have seen any success with the program as it is above. If you look at the RedHat Linux man page for clock(), you will see that it "returns an approximation of processor time used by the program". Putting in OpenMP directives causes more overhead, and thus you should see more overall processor time used when you run OpenMP.

What you need to look at is elapse time (or wall clock time). When you run in parallel (and you have a program that can benefit from parallel), you will see the elapse time go down. The OpenMP specification defines a routine (omp_get_wtime()) to provide this information.

OpenMP does not parallelize loops with function calls inside it, unless arguments are private. A solution would be to inline is_prime() in your loop.

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