首页 \ 问答 \ 闲置时JVM锯齿图案？(JVM sawtooth pattern when idle? what does the JVM do in the meantime?)

闲置时JVM锯齿图案？(JVM sawtooth pattern when idle? what does the JVM do in the meantime?)

我在想。 我有一个简单的Java Web项目和一个servlet。 当没有用户使用它（我在GlassFish上本地托管它）时，我仍然在该进程的内存使用情况中看到锯齿图案。 我似乎无法理解JVM在做什么？ 我了解JVM使用的内存的正常流程。 堆正在充满应用程序正在创建的对象。 在某个时间点，堆会到达垃圾收集器进入的点，这将删除所有不再使用的“缓存”对象，以便可以创建新对象并且可以填充堆大小。
我想知道的是，JVM闲置时一直在做什么？
编辑：
就像我在评论中所说的那样。 我在Eclipse中创建了一个非常简单的Java应用程序，该应用程序显示一个Swing窗口，显示“hello world”。 当我在Java VisualVM中观察JVM的内存使用情况时，我看到了相同的锯齿图案。

I was wondering. I have a simple Java web project with a servlet. When no users are using it (I host it local on GlassFish) I still see a sawtooth pattern in the memory usage of the process. I can't seem to understand what the JVM is doing? I understand the normal flow of the memory used by JVM. The heap is getting filled with objects the application is creating. At a certain point the heap reaches a point where the garbage collector comes in, which will remove all the 'cached' objects which no longer are used, so that new objects can be created and can be filled in the heap size.
What I wonder is, what is the JVM doing all the time when it's idle?
EDIT:
Like I said in the comments. I created a very simple Java application in Eclipse which showed a Swing window saying 'hello world'. When I watch the memory usage of the JVM in Java VisualVM, I see the same sawtooth pattern.

原文：https://stackoverflow.com/questions/12958219

更新时间：2023-10-28 14:10

最满意答案

 该模块有点搞砸了。 它应该遵循这种模式：  
var sliderJS = function(sliderID) {

    //define private functions here eg. setEventListeners

    //Return an object containing functions that are public eg. doSlide
    return {
        doSlide: function(type, e){

        }
    };
};
 
 所以你不需要new关键字，只需调用：  
var slider1 = sliderJS("mySliderJS2");
 
 但是，如果您创建了大量实例并希望获得更好的性能，那么最好创建一个函数并填充其原型 - 然后您可以使用new关键字调用该函数。 

The module is a little bit messed up. It should follow this pattern: 
var sliderJS = function(sliderID) {

    //define private functions here eg. setEventListeners

    //Return an object containing functions that are public eg. doSlide
    return {
        doSlide: function(type, e){

        }
    };
};
 
So you don't need the new keyword, just call: 
var slider1 = sliderJS("mySliderJS2");
 
If, however, you're creating a lot of instances and would prefer better performance, you'd be better off creating a function and populating its prototype - then you can call that function with the new keyword.

闲置时JVM锯齿图案？(JVM sawtooth pattern when idle? what does the JVM do in the meantime?)

最满意答案

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