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Aaron Hillegass: How to Time

#import 

uint64_t start = mach_absolute_time();

// do stuff to be timed

uint64_t end = mach_absolute_time();

uint64_t elapsed = end - start;

mach_timebase_info_data_t info;

if (mach_timebase_info (&info) != KERN_SUCCESS) {

    printf ("mach_timebase_info failed\n");

}

uint64_t nanosecs = elapsed * info.numer / info.denom;

uint64_t millisecs = nanosecs / 1000000;