如何在 Scala 中分析方法? [英] How to profile methods in Scala?

问题描述

分析 Scala 方法调用的标准方法是什么?

What is a standard way of profiling Scala method calls?

我需要的是围绕一个方法的钩子，我可以使用它来启动和停止计时器.

What I need are hooks around a method, using which I can use to start and stop Timers.

在 Java 中，我使用方面编程，aspectJ，来定义要分析的方法并注入字节码以实现相同的目的.

In Java I use aspect programming, aspectJ, to define the methods to be profiled and inject bytecode to achieve the same.

在 Scala 中是否有更自然的方法，我可以在其中定义一堆要在函数之前和之后调用的函数，而不会在过程中丢失任何静态类型?

Is there a more natural way in Scala, where I can define a bunch of functions to be called before and after a function without losing any static typing in the process?

推荐答案

您是否希望在不更改要为其测量计时的代码的情况下执行此操作?如果您不介意更改代码，那么您可以执行以下操作:

Do you want to do this without changing the code that you want to measure timings for? If you don't mind changing the code, then you could do something like this:

def time[R](block: => R): R = {
    val t0 = System.nanoTime()
    val result = block    // call-by-name
    val t1 = System.nanoTime()
    println("Elapsed time: " + (t1 - t0) + "ns")
    result
}

// Now wrap your method calls, for example change this...
val result = 1 to 1000 sum

// ... into this
val result = time { 1 to 1000 sum }

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