在上面的示例代码中,我们首先通过ManagementFactory.getMemoryMXBean()方法获取MemoryMXBean对象,然后通过该对象的getHeapMemoryUsage()和getNonHeapMemoryUsage()方法分别获取堆内存和非堆内存的使用情况。最后,我们将获取到的内存使用情况打印到控制台上。 结语 通过本文的介绍,我们了解了如何使用Java代码获取JVM内存使用情...
这行代码通过`ManagementFactory`的`getMemoryMXBean`方法获取了当前JVM的`MemoryMXBean`对象,通过该对象我们可以获取JVM内存的使用情况。 ### 步骤2:获取内存使用情况 接下来,我们可以通过`MemoryMXBean`对象来获取内存使用情况,包括堆内存和非堆内存的使用情况。代码如下: ```java MemoryUsage heapMemory = memoryBe...
JVM中MemoryUsage中init,committed,used,max的含义 packagejava.lang.management;importjavax.management.openmbean.CompositeData;importsun.management.MemoryUsageCompositeData;/*** A MemoryUsage object represents a snapshot of memory usage. * Instances of the MemoryUsage class are usually constructed * by meth...
;//Used:7MBSystem.out.println(mxb.getNonHeapMemoryUsage().toString());//init = 2555904(2496K) used = 7802056(7619K) committed = 9109504(8896K) max = -1(-1K)} 5、获取JVM的内存池情况 @Testpublicvoidtest5() { List<MemoryPoolMXBean> mxb =ManagementFactory.getMemoryPoolMXBeans();for(...
put("JVM最大可用内存",jvmMaxMem); memoryUsageMap.put("JVM已使用的内存",jvmUsedMem); result.put("系统内存使用情况",memoryUsageMap); return result; } public Mapcpu() { Map result =Maps.newHashMap(); SystemInfo systemInfo =new SystemInfo(); result.put("程序启动时间",new SimpleDateFormat...
常用命令: jstack pid 堆栈信息 jstat -gcutil pid 1000 间隔1000ms采样GC信息 jmap -heap pid打印jvm heap的情况 jmap -histo pid 打印jvm heap的直方图。其输出信息包括类名,对象数量,对象占用大小。 jmap -histo:live pid 同上,但是只打印存活对象的情况。
committed memory不一定都是resident memory,因为malloc/mmap is lazy unless told otherwise. Pages are only backed by physical memory once they're accessed. 图片来自:https://www.ibm.com/developerworks/library/j-memusage/index.html https://stackoverflow.com/questions/31173374/why-does-a-jvm-report-...
9.2.1 Configuring Memory Initialization Parameters You can modify the following database initialization parameters to tune your memory usage to reflect your application needs more accurately: SHARED_POOL_SIZE Shared pool memory is used by the class loader within the JVM. The class loader, on an ...
10.2.1Configuring Memory Initialization Parameters You can modify the following database initialization parameters to tune your memory usage to reflect your application needs more accurately: SHARED_POOL_SIZE Shared pool memory is used by the class loader within the JVM. The class loader, on an aver...
();List<MemoryPoolMXBean>memoryPoolMXBeans=ManagementFactory.getMemoryPoolMXBeans();for(MemoryPoolMXBeanmemoryPoolMXBean:memoryPoolMXBeans){builder.append(memoryPoolMXBean.getName());builder.append(" ");longused=memoryPoolMXBean.getUsage().getUsed()/(1024*1024);builder.append(used);builder....