在Java中计算可用内存的最佳方法是什么?
发布时间:2020-12-14 16:37:46 所属栏目:Java 来源:网络整理
导读:我试图计算出我的 Java程序有多少内存可用. 我现在有这个实现: long getAvailableMemory() { Runtime runtime = Runtime.getRuntime(); long totalMemory = runtime.totalMemory(); long freeMemory = runtime.freeMemory(); long maxMemory = runtime.maxM
我试图计算出我的
Java程序有多少内存可用.
我现在有这个实现: long getAvailableMemory() { Runtime runtime = Runtime.getRuntime(); long totalMemory = runtime.totalMemory(); long freeMemory = runtime.freeMemory(); long maxMemory = runtime.maxMemory(); long usedMemory = totalMemory - freeMemory; long availableMemory = maxMemory - usedMemory; return availableMemory; } 是对的吗?有更简单/更准确的计算方法吗?看了别人的代码之后,我看到这样的东西有些不同: long getAvailableMemory() { long totalVmHeap = Runtime.getRuntime().totalMemory(); long freeVmHeap = Runtime.getRuntime().freeMemory(); long usedVmHeap = totalVmHeap - freeVmHeap; long maxVmHeap = Runtime.getRuntime().maxMemory(); long availableVmHeap = maxVmHeap - usedVmHeap + freeVmHeap; return availableVmHeap; } 无论如何,获取这些信息的正确方法是什么? 解决方法
你的解决方案对我来说是正确的(在下面评论来解释你正在计算的):
long getAvailableMemory() { Runtime runtime = Runtime.getRuntime(); long totalMemory = runtime.totalMemory(); // current heap allocated to the VM process long freeMemory = runtime.freeMemory(); // out of the current heap,how much is free long maxMemory = runtime.maxMemory(); // Max heap VM can use e.g. Xmx setting long usedMemory = totalMemory - freeMemory; // how much of the current heap the VM is using long availableMemory = maxMemory - usedMemory; // available memory i.e. Maximum heap size minus the current amount used return availableMemory; } 我不知道你的用例是什么,但是在堆内也有限制,你可能想看看PermGen大小:How do I programmatically find out my PermGen space usage? (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |