Java内存使用 [英] Java memory usages

问题描述

我无法理解Java内存的使用情况。我有一个应用程序，最大内存大小设置为256M。然而，在某个时间点，我可以看到，根据任务管理器，它需要高达700MB！

I cannot understand the Java memory usage. I have an application which is executed with maximum memory size set to 256M. Yet, at some point in time I can see that according to the task manager it takes up to 700MB!

不用说，所有其他应用程序都有点这种情况发生时没有反应，因为它们可能被换掉了。

Needless to say, all the rest of the applications are a bit unresponsive when this happens as they are probably swapped out.

在WinXP上它是JDK 1.6。有什么想法？

It's JDK 1.6 on WinXP. Any ideas ?

推荐答案

配置的内存可供应用程序使用。它不包括

The memory configured is available to the application. It won't include

1. JVM大小


2. 加载的jars / libs


3. 本地库和相关的已分配内存

这会产生更大的图像。请注意，由于操作系统和JVM如何工作，700Mb可以在多个JVM之间共享（由于共享二进制映像，共享库等）。

which will result in a much bigger image. Note that due to how the OS and the JVM work that 700Mb may be shared between multiple JVMs (due to shared binary images, shared libraries etc.)

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