timeit for scala

timeit.scala

  def timeit (warmups: Int, trials: Int) (block: => Unit): Unit = {
    import Math.{min,max}

    for (i <- 1 to warmups) block

    var total = 0.0
    var best = Long.MaxValue
    var worst = Long.MinValue
    for (i <- 1 to trials) {
      val beg = System.nanoTime()
      block
      val end = System.nanoTime()
      val elapsed = max(0, end - beg)
      total += elapsed
      best = min(best, elapsed)
      worst = max(worst, elapsed)
    }


    println(s"$warmups warmups / $trials trials  best|mean|worst = $best|${total/trials.toDouble}|$worst ns")
  }