Scalaのベンチマーク用スニペット

Benchmark.scala

def timeOf(action: => Unit, noTimes: Int = 10, multiplier: Int = 1): Double = {
    import java.util.concurrent.TimeUnit
    val runtime = Runtime.getRuntime
    val result = (1 to noTimes + 1) map { _ =>
            val startTime = System.nanoTime
            var i = 0
            while (i < multiplier) {
                action
                i += 1
            }
            val stopTime = System.nanoTime
            runtime.gc()

            TimeUnit.MICROSECONDS.convert(stopTime - startTime,
              TimeUnit.NANOSECONDS).asInstanceOf[Double]
          }
    result.sum / noTimes
}