如何查看应用程序正在使用的当前堆大小? [英] How to view the current heap size that an application is using?
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问题描述
我想我增加了我的堆大小为1 GB的NetBeans,因为我改变了配置看起来是这样的:
I think I increased my heap size to 1 GB in NetBeans since I changed the config to look like this:
netbeans_default_options="-J-Xmx1g ......
重新启动NetBeans后,我能确定吗?我的应用程序现在是1 GB?
After I restarted NetBeans, can I be sure that my app is given 1 GB now?
有没有办法验证这个?
推荐答案
使用此代码:
// Get current size of heap in bytes
long heapSize = Runtime.getRuntime().totalMemory();
// Get maximum size of heap in bytes. The heap cannot grow beyond this size.// Any attempt will result in an OutOfMemoryException.
long heapMaxSize = Runtime.getRuntime().maxMemory();
// Get amount of free memory within the heap in bytes. This size will increase // after garbage collection and decrease as new objects are created.
long heapFreeSize = Runtime.getRuntime().freeMemory();
它是对我来说很有用t。
It was useful to me to know it.
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