Scala collection insert performance (2.9.3)

InsertPerf.scala

// 1001  381	384	384	383	384	407	404	409	407

object ArrayBufferBenchmark extends scala.testing.Benchmark {

  def run = {

    val len = 10 * 1000 * 1000
    val a = new scala.collection.mutable.ArrayBuffer[Int](len)

    var i = 0
    while (i < len) {
      a += i
      i += 1
    }

    println(a(100))
  }
}


// 962	384	371	364	371	393	396	386	388	386

object ArrayListBenchmark extends scala.testing.Benchmark {

  def run = {

    val len = 10 * 1000 * 1000
    val a = new java.util.ArrayList[Int](len)

    var i = 0
    while (i < len) {
      a.add(i)
      i += 1
    }

    println(a.get(100))
  }
}

// 939	366	359	356	361	357	382	378	382	381

object ArrayBoxingBenchmark extends scala.testing.Benchmark {

  def run = {

    val len = 10 * 1000 * 1000
    val a = new Array[java.lang.Integer](len)

    var i = 0
    while (i < len) {
      a(i) = i
      i += 1
    }

    println(a(100))
  }
}



// 133	56	57	58	57	58	57	58	56	57

object ArrayBoxingOnlyBenchmark extends scala.testing.Benchmark {

  def run = {

    val len = 10 * 1000 * 1000
    val a = new Array[Int](len)

    var i = 0
    while (i < len) {
      a(i) = Integer.valueOf(i)
      i += 1
    }

    println(a(100))
  }
}


// 29 18  13  12  15  14  12  15  13  14

object ArrayBenchmark extends scala.testing.Benchmark {

  def run = {

    val len = 10 * 1000 * 1000
    val a = new Array[Int](len)

    var i = 0
    while (i < len) {
      a(i) = i
      i += 1
    }

    println(a(100))
  }
}

// 151  72	67	65	65	66	64	65	63	64

object ArrayBuilderBenchmark extends scala.testing.Benchmark {

  def run = {

    val len = 10 * 1000 * 1000
    val a = scala.collection.mutable.ArrayBuilder.make[Int]
    a.sizeHint(len)

    var i = 0
    while (i < len) {
      a += i
      i += 1
    }

    println(a.result()(100))
  }
}


// 58	34	14	14	14	16	14	17	18	14

object FastUtilBenchmark extends scala.testing.Benchmark {

  def run = {

    val len = 10 * 1000 * 1000
    val a = new it.unimi.dsi.fastutil.ints.IntArrayList(len)

    var i = 0
    while (i < len) {
      a.add(i)
      i += 1
    }

    println(a.elements()(100))
  }
}