Different load between rhel6 and rhel7

Dear Red Hat,

I have run a little program on Rhel6 and Rhel 7.

Linux Rhel7 3.10.0-957.10.1.el7.x86_64 #1 SMP Thu Feb 7 07:12:53 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Linux Rhel6 2.6.32-754.9.1.el6.x86_64 #1 SMP Wed Nov 21 15:08:21 EST 2018 x86_64 x86_64 x86_64 GNU/Linux

#include 
#include 
int main(void)
{
        struct timespec tt;
        struct timespec tc;
        int a;
        int q;
        tt.tv_nsec=10000;
        tt.tv_sec=0;
        for (a=0; a100; a++)
        {
                q = fork();
                if (q == 0)
                {
                        printf("Child\n");
                        break;
                }
                else
                {
                        printf("%i\n", a);
                }
        }

        for (a=0; a1000000; a++)
        {
                nanosleep(&tt,&tc);
        }
}

I have same results on both servers, but not load average.
server Rhel7
load average: 14,23, 8,30, 5,69
real 1m31.723s
user 0m1.544s
sys 0m10.330s
server Rhel6
load average: 0.01, 0.03, 0.00
real 1m35.845s
user 0m1.165s
sys 0m4.444s

Why load average are different when they do the same program?