１．監控程序運行堆棧

val currentThread = Thread.currentThread()
@volatile
var flag = false
val t = new Thread(
  new Runnable {
    override def run(): Unit = {
      while(!flag) {
        val stackElements = currentThread.getStackTrace
        logger.info(stackElements.map(_.toString).mkString("\n"))
        Thread.sleep(100)
      }
    }
  }
)
t.start()

......//do something

var flag = true

２．　計時及運行次數；

定義計時：

import org.slf4j.LoggerFactory

/**
 * 類功能描述：Debug日誌追蹤
 *
 * @author barry create at 18-8-29 下午3:41
 * @version 1.0.0
 */
object Debug {
  val LOGGER = LoggerFactory.getLogger(getClass)
  val counter = collection.mutable.Map[String, Int]() // label -> count
 val times = collection.mutable.Map[String, Long]() // label - time(ns)

 /**
 *追蹤代碼塊
 * @param label 標簽名
 * @param codeBlock 代碼塊
 * @tparam T 返回結果類型
 * @return
 */
 def trace[T](label: String)(codeBlock: => T) = {
    val t0 = System.nanoTime()
    val result = codeBlock
    val t1 = System.nanoTime()
    counter.get(label).map(_counter => counter.put(label, _counter + 1)).orElse(counter.put(label, 1))
    times.get(label).map(cost => times.put(label, cost + (t1 - t0))).orElse(times.put(label, t1 - t0))
    result
  }

  /**
 * 打印日誌
 */
 def info(): Unit = {
    LOGGER.warn("FinallyDone...")
    LOGGER.warn(s"counter:${counter}")
    LOGGER.warn(s"times:${times.map { case (label, cost) => (label, cost / 1000000)}}ms")
  }

  /**
 * 重新計數
 */
 def reset(): Unit = {
    counter.clear()
    times.clear()
  }
}

監控程序運行兩種方法