测量“忙碌"事件调度线程 [英] Measuring "busyness" of the event dispatching thread

问题描述

我想衡量我的事件调度线程的繁忙程度".一种可能的想法是设置一个后台线程，执行以下操作:

I would like to measure the "busyness" of my Event Dispatching Thread. One possible idea is to set up a background thread that does something like:

while(true) {
    final long[] end = new long[1]; // Array to get stuff out from Runnable.
    long start = System.nanoTime();
    EventQueue.invokeAndWait(new Runnable() {
        public void run() {
            end[0] = System.nanoTime(); 
        }
    });
    long queueTimeNs = end[0] - start;
    // Report the queue time somewhere.
    Thread.sleep(100); // Poll the EDT < 10 times/s.
}

这个想法是测量从将事件发送到 EDT 到它被分派所需的时间.这将粗略地了解用户界面的响应能力.

The idea is to measure how long it takes from sending an event to the EDT to it getting dispatched. This would give a rough idea about the responsiveness of the UI.

这有意义吗?有没有更标准的方法来做类似的事情?

Does this make any sense? Is there some more standard way to do something similar?

推荐答案

为此我使用了一个出色的工具:SwingExplorer.它允许您检查 Swing 组件、查看它们的绘制方式、检测 EDT 违规以及检测 EDT 的挂起.基本上，您输入一个以毫秒为单位的持续时间值，然后您就可以使用您的应用程序.当 EDT 挂起的时间超过此持续时间时，挂起会记录在工具的 UI 中.

I use an excellent tool for this : SwingExplorer. It allows you to inspect your Swing components, to see how they are drawn, to detect the EDT violations, and to detect the hangs of the EDT. Basically, you enter a duration value in milliseconds, and then you play with your app. When the EDT hangs for more than this duration, the hang is logged in the tool's UI.

官方网站是https://swingexplorer.dev.java.net，但似乎在我写这个答案的那一刻下来.你可以找到Eclipse和NetBeans的插件，你也可以在maven仓库上找到swingexplorer，如果你使用maven(抱歉，我暂时找不到链接)

The official site is https://swingexplorer.dev.java.net, but it seems to be down at the moment I write this answer. You can find a plugin for Eclipse and NetBeans, and you can also find swingexplorer on a maven repository, if you use maven (sorry, I can't find a link for the moment)

至少存储库仍然可用:cvs -d :pserver:guest:[e-mail]:/shared/data/ccvs/repository co swingexplorer

我查看了 Swing explorer 的源代码，似乎他们编写了一个自定义的 EventQueue 来检查 EDT 行为.该代码似乎与另一个项目有关，SwingHelper.

I looked at the source code of Swing explorer, and it appears that they wrote a custom EventQueue to inspect the EDT behavior. The code seems to be related to another project, SwingHelper.

该项目的网站将很快返回 http://java.net/projects/swingexplorer

The project's site will come back soon at http://java.net/projects/swingexplorer

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