arthas

Class VmTool

java.lang.Object

arthas.VmTool

All Implemented Interfaces:

VmToolMXBean

public class VmTool
extends Object
implements VmToolMXBean

Since:

3.5.1

Author:

ZhangZiCheng 2021-02-12, hengyunabc 2021-04-26

Field Summary

Fields

Modifier and Type	Field and Description
static String	JNI_LIBRARY_NAME 不要修改jni-lib的名称

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
static VmTool	getInstance()
static VmTool	getInstance(String libPath)
<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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

JNI_LIBRARY_NAME

public static final String JNI_LIBRARY_NAME

不要修改jni-lib的名称

See Also:

Constant Field Values

Method Detail

getInstance

public static VmTool getInstance()

getInstance

public static VmTool getInstance(String libPath)

forceGc

public void forceGc()

Description copied from interface: VmToolMXBean

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

Specified by:

forceGc in interface VmToolMXBean

getInstances

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

Specified by:

getInstances in interface VmToolMXBean

getInstances

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

Description copied from interface: VmToolMXBean

获取某个class在jvm中当前所有存活实例

Specified by:

getInstances in interface VmToolMXBean

limit - 如果小于 0 ，则不限制

Returns:

sumInstanceSize

public long sumInstanceSize(Class<?> klass)

Description copied from interface: VmToolMXBean

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

Specified by:

sumInstanceSize in interface VmToolMXBean

getInstanceSize

public long getInstanceSize(Object instance)

Description copied from interface: VmToolMXBean

获取某个实例的占用内存，单位：Byte

Specified by:

getInstanceSize in interface VmToolMXBean

countInstances

public long countInstances(Class<?> klass)

Description copied from interface: VmToolMXBean

统计某个class在jvm中当前所有存活实例的总个数

Specified by:

countInstances in interface VmToolMXBean

getAllLoadedClasses

public Class<?>[] getAllLoadedClasses()

Description copied from interface: VmToolMXBean

获取所有已加载的类

Specified by:

getAllLoadedClasses in interface VmToolMXBean