Re: Time measurement
Re: Time measurement
- Subject: Re: Time measurement
- From: Rob Keniger <email@hidden>
- Date: Tue, 2 Dec 2008 17:18:21 +1000
On 02/12/2008, at 5:08 PM, Daniel Luis dos Santos wrote:
Hello,
Not sure I should ask this here.
How do I get time measurements in milliseconds? What is the accuracy
of the mac's C library implementation ?
I am using the clock() function from time.h and measuring
differences in seconds between the trigering of a NSTimer.
The NSTimer fires every 0.1 secs, and in the event code I measure
the difference between the current clock() call and the previous. I
then divide it by the CLOCKS_PER_SEC constant and get two orders of
magnitude difference than the interval in the timer. I get 0.001
secs instead of the 0.1 of the NSTimer.
Any ideias ?
You can use the Microseconds() call to get microsecond-accurate
timing. It's declared in CoreServices/Timer.h.
This page has some handy info on making use of it:
http://www.meandmark.com/timingpart2.html
--
Rob Keniger
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