如何从Java程序中获取JVM的最小和最大堆大小设置

Question

如何从Java程序中获取VM的最小和最大堆大小设置？

Answer 1

最大堆大小：

Runtime.getRuntime().maxMemory();

您可能会感兴趣的其他一些计算：

Runtime runtime = Runtime.getRuntime();
long maxMemory = runtime.maxMemory();
long allocatedMemory = runtime.totalMemory();
long freeMemory = runtime.freeMemory();
long totalFreeMemory = freeMemory + (maxMemory - allocatedMemory);
long usedMemory = maxMemory - totalFreeMemory;

Answer 2

您只需要将Runtime对象与Runtime.getRuntime（）一起使用，然后使用totalMemory（）等方法freeMemory（）

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html#freeMemory()

Answer 3

也许这可以帮到你？

http://download.oracle.com/docs/cd/E11035_01/wls100/perform/JVMTuning.html#wp1109778 http://javahowto.blogspot.com/2006/06/6-common-errors-in-setting-java-heap.html http://www.caucho.com/resin-3.0/performance/jvm-tuning.xtp http://blog.paulgu.com/2008/07/19/6-common-errors-in-setting-java-heap-size/

Answer 4

ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()