spark TimeTracker 源码
spark TimeTracker 代码
文件路径：/mllib/src/main/scala/org/apache/spark/ml/tree/impl/TimeTracker.scala
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.ml.tree.impl
import scala.collection.mutable.{HashMap => MutableHashMap}
/**
* Time tracker implementation which holds labeled timers.
*/
private[spark] class TimeTracker extends Serializable {
private val starts: MutableHashMap[String, Long] = new MutableHashMap[String, Long]()
private val totals: MutableHashMap[String, Long] = new MutableHashMap[String, Long]()
/**
* Starts a new timer, or re-starts a stopped timer.
*/
def start(timerLabel: String): Unit = {
val currentTime = System.nanoTime()
if (starts.contains(timerLabel)) {
throw new RuntimeException(s"TimeTracker.start(timerLabel) called again on" +
s" timerLabel = $timerLabel before that timer was stopped.")
}
starts(timerLabel) = currentTime
}
/**
* Stops a timer and returns the elapsed time in seconds.
*/
def stop(timerLabel: String): Double = {
val currentTime = System.nanoTime()
if (!starts.contains(timerLabel)) {
throw new RuntimeException(s"TimeTracker.stop(timerLabel) called on" +
s" timerLabel = $timerLabel, but that timer was not started.")
}
val elapsed = currentTime - starts(timerLabel)
starts.remove(timerLabel)
if (totals.contains(timerLabel)) {
totals(timerLabel) += elapsed
} else {
totals(timerLabel) = elapsed
}
elapsed / 1e9
}
/**
* Print all timing results in seconds.
*/
override def toString: String = {
totals.map { case (label, elapsed) =>
s" $label: ${elapsed / 1e9}"
}.mkString("\n")
}
}
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