如何从JVM获取堆和permgen的最大大小？ [英] How to get the max sizes of the heap and permgen from the JVM?

问题描述

我试图以编程方式找出调用我的程序的JVM的最大permgen和最大堆大小，而不是当前可用的大小。

<有没有办法做到这一点？

我熟悉Java Runtime对象中的方法，但不清楚它们真正提供的是什么。

或者，有没有办法向Eclipse询问为这两个分配了多少钱？

解决方案

试试这个：

  MemoryMXBean mem = ManagementFactory.getMemoryMXBean（）; 
 mem.getHeapMemoryUsage（）。getUsed（）; 
 mem.getNonHeapMemoryUsage（）。getUsed（）; 
  

但它们只提供快照数据，而非累积值。

I am trying to find out programatically the max permgen and max heap size with which a the JVM for my program has been invoked, not what is currently available to them.

Is there a way to do that?

I am familiar with the methods in Java Runtime object, but its not clear what they really deliver.

Alternatively, is there a way to ask Eclipse how much was allocated for these two?

解决方案

Try this ones:

MemoryMXBean mem = ManagementFactory.getMemoryMXBean();
mem.getHeapMemoryUsage().getUsed();
mem.getNonHeapMemoryUsage().getUsed();

But they only offer snapshot data, not a cummulated value.

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