arthas

Interface VmToolMXBean

All Known Implementing Classes:

VmTool

public interface VmToolMXBean

VmTool interface for JMX server. How to register VmTool MBean:

 
     ManagementFactory.getPlatformMBeanServer().registerMBean(
             VmTool.getInstance(),
             new ObjectName("arthas:type=VmTool")
     );
 
 

Author:

hengyunabc 2021-04-26

Method Summary

Modifier and Type	Method and Description
long	countInstances(Class<?> klass) 统计某个class在jvm中当前所有存活实例的总个数
void	forceGc() https://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html#ForceGarbageCollection
Class<?>[]	getAllLoadedClasses() 获取所有已加载的类
<T> T[]	getInstances(Class<T> klass)
<T> T[]	getInstances(Class<T> klass, int limit) 获取某个class在jvm中当前所有存活实例
long	getInstanceSize(Object instance) 获取某个实例的占用内存，单位：Byte
long	sumInstanceSize(Class<?> klass) 统计某个class在jvm中当前所有存活实例的总占用内存，单位：Byte

Method Detail

forceGc

void forceGc()

https://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html#ForceGarbageCollection

getInstances

<T> T[] getInstances(Class<T> klass)

getInstances

<T> T[] getInstances(Class<T> klass,
                     int limit)

获取某个class在jvm中当前所有存活实例

Type Parameters:

T -

Parameters:

klass -

limit - 如果小于 0 ，则不限制

Returns:

sumInstanceSize

long sumInstanceSize(Class<?> klass)

统计某个class在jvm中当前所有存活实例的总占用内存，单位：Byte

getInstanceSize

long getInstanceSize(Object instance)

获取某个实例的占用内存，单位：Byte

countInstances

long countInstances(Class<?> klass)

统计某个class在jvm中当前所有存活实例的总个数

getAllLoadedClasses

Class<?>[] getAllLoadedClasses()

获取所有已加载的类