??????λ??????????????cpu??????????????????????cpu???????????????????????????????λ????
?????ó????￡? jstack+top????????????????
????jstack+top
????jstack+top???????·??
????1??top -H ??cpu??y???????????????????id
????2??jstack  ????????dump??????У???????и??????id????????????? ???jstack????????id??16???????????????ν????????
????3???о??????????
????jstack+top?????????
????1???鷳??????top????????????仯????????????Σ??????????????????????????
????2?????????????top -H????????????cpu???????????jstack ????????????sleep??????????????????????APM
????????????????Щ?鷳 —— ???????????????????????????????cpu???????? —— Hot Threads ?????
????Hot Threads
????Hot Threads?????С?????????????????????
????1??????jar???????????????
????2?????java -jar HotThread.jar [pid] ?????pid??????????????????????·?????ɡ?
????Hot Threads???????
?????????????????Hot Threads??????????????????10????????????????sun.management.ThreadImpl.getThreadInfo??????????????cpu?????3?????????????????????cpu??????
106.3% CPU Usage by Thread 'Swing-Shell'
10/10 snapshots sharing following 10 elements
sun.awt.shell.Win32ShellFolder2.getAttributes0(Native Method)
sun.awt.shell.Win32ShellFolder2.access$600(Unknown Source)
sun.awt.shell.Win32ShellFolder2$6.call(Unknown Source)
sun.awt.shell.Win32ShellFolder2$6.call(Unknown Source)
java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
java.util.concurrent.FutureTask.run(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
1.6% CPU Usage by Thread 'RMI TCP Connection(9)-172.30.41.210'
10/10 snapshots sharing following 32 elements
sun.management.ThreadImpl.getThreadInfo0(Native Method)
sun.management.ThreadImpl.getThreadInfo(Unknown Source)
sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(Unknown Source)
com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(Unknown Source)
com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(Unknown Source)
com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(Unknown Source)
com.sun.jmx.mbeanserver.PerInterface.invoke(Unknown Source)
com.sun.jmx.mbeanserver.MBeanSupport.invoke(Unknown Source)
javax.management.StandardMBean.invoke(Unknown Source)
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(Unknown Source)
com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(Unknown Source)
javax.management.remote.rmi.RMIConnectionImpl.doOperation(Unknown Source)
javax.management.remote.rmi.RMIConnectionImpl.access$200(Unknown Source)
javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(Unknown Source)
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(Unknown Source)
javax.management.remote.rmi.RMIConnectionImpl.invoke(Unknown Source)
sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
sun.rmi.transport.Transport$1.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
sun.rmi.transport.Transport.serviceCall(Unknown Source)
sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
0.0% CPU Usage by Thread 'Reference Handler'
10/10 snapshots sharing following 3 elements
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:485)
java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)
???????????????? 10/10 ???? n / m ??ζ??m??????У???n?ζ??????????