use blitz

gistfile1.scala

import scala.collection.par._
import scala.collection.par.Scheduler.Implicits.global

object iterate {
  def triangles_blitz(n: Int) = for {
    x <- (0 until n).toPar
    y <- 0 until x
  } yield { y }: @unchecked

  def triangles(n: Int) = for {
    x <- (0 until n)
    y <- 0 until x
  } yield y

  def main(args: Array[String]): Unit = {
    val start = System.currentTimeMillis
    triangles(10000)
    println((System.currentTimeMillis - start) + "msec")

    val start2 = System.currentTimeMillis
    triangles_blitz(10000)
    println((System.currentTimeMillis - start2) + "msec")
  }
}