On Jul 21, 2011, at 7:59 PM, Eric E. Dolecki wrote:
> I'm curious if there is a way to NSLog how long some code takes to execute
> (outside of using Instruments).
>
> In Flash one can use getTimer and see how much time passed inline. Is there
> a way to do this in Obj-C?
>
> Would one use a NSDate object?
For better accuracy, you may use function mach_absolute_time().
For example:
#include <mach/mach.h>
#include <mach/mach_time.h>
static uint64_t absoluteTimeToNanoseconds(uint64_t t)
{
static mach_timebase_info_data_t sTimebaseInfo; // (note: static data will
be zero initialized)
// setup the mach timebase info
if ( sTimebaseInfo.denom == 0 ) {
(void) mach_timebase_info(&sTimebaseInfo);
}
uint64_t elapsedNano = t * sTimebaseInfo.numer / sTimebaseInfo.denom;
return elapsedNano;
}
void foo()
{
uint64_t t0 = mach_absolute_time();
// do some stuff …
// ...
uint64_t t1 = mach_absolute_time();
uint64_t elapsedNanoseconds = absoluteTimeToNanoseconds(t1 - t0);
NSLog(@"Elapsed time: %.2f ms", elapsedNanoseconds*1e-6];
}
There is also the tool "time" (see man time(1)) which can be used to measure
runtime of executables running in the console.
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