PASSES
for (i=0; i<2*(PASSES/2); i++) {
for (i=0; i<PASSES/2; i++) {
printf("min latency: %f\n", (double)min_time / PASSES);
printf("max latency: %f\n", (double)max_time / PASSES);
printf("mean latency: %f\n", (double)sum / ITERATIONS / PASSES);