#import// for mach_absolute_time
double MachTimeToSecs(uint64_t time)
{
mach_timebase_info_data_t timebase;
mach_timebase_info(&timebase);
return (double)time * (double)timebase.numer / (double)timebase.denom / 1e9;
}
uint64_t begin = mach_absolute_time();
[self doSomething];
uint64_t end = mach_absolute_time();
NSLog(@"Time %g s", MachTimeToSecs(end - begin));
