TestSystemNanotime.scala

// http://stackoverflow.com/questions/510462/is-system-nanotime-completely-useless

import scala.collection.mutable

val numThreads = 10

val numValuesPerThread = 10

var threadResult = mutable.Map[Int, Seq[Long]]()

val threadList = for (currentThreadIndex <- 0 to numThreads) yield {
  new Thread(new Runnable {
    override def run(): Unit = {
      threadResult(currentThreadIndex) =
        (0 to numValuesPerThread).map { case _ => System.nanoTime }
    }
  }, s"thread-$currentThreadIndex")
}


threadList foreach { thread => thread.start() }
println(s"All threads started. (result size = ${threadResult.size})")
threadList foreach { thread => thread.join() }
println(s"All threads joined. (result size = ${threadResult.size})")
for (currentThreadIndex <- 0 to numThreads;
     currentValueIndex <- 0 to numValuesPerThread) {
  val list: Seq[Long] = threadResult(currentThreadIndex)
}

var l0 = List(1,2,3,4,8)

https://github.com/ktoso/sbt-jmh

http://shipilev.net/blog/2014/nanotrusting-nanotime/