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How to Time

Aaron Hillegass

I was asked three times last week how I find how long an activity takes on the Mac and the iPhone.  Here is the most accurate method that I know of:

#import <mach/mach_time.h>

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 failedn");
}

uint64_t nanosecs = elapsed * info.numer / info.denom;
uint64_t millisecs = nanosecs / 1000000;

As you use this, remember that the elapsed time for a given function will vary with the load the system is under.

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