title: Rudimentary ways to measure execution time of a method
body: <p>What object/method would I call to get current time in milliseconds (or great precision) to help measure how long a method took to execute?</p>
  
  <p>NSDate's timeIntervalSinceDate will return NSInterval which is measured in seconds. I am looking for something finer grained, something similar to Java's System.currentTimeMillis. </p>
  
  <p>Is there an equivalent version in objective-c/CocoaTouch?</p>