Bench3.scala

Bench3.scala

package benchmark

object Bench3 extends App {
  val num: Int = 1000

  def time[A](f: => A) : (A, Long) = {
     val start = System.nanoTime()
     val res = f
     res -> (System.nanoTime() - start)
   }

   def test(times: Int) : (Int, Long) = time {
      var i,j,k = 0
      var x: Any = null
      var res = 0
      while(i < times) {
         while(j < num) {
            while(k < num) {
               x = new Object()
               res += x.hashCode // need to use `x` to avoid interference from HotSpot smartness
               k += 1
            }
            k = 0
            j += 1
         }
         j = 0
         i += 1
      }
      res
   }

   // warmup
   test(200)
   // measured run
   val (_, elapsed) = test(2000)
   println( "Result = " + elapsed/2000.0 + " ns" )
}