jstack 은 자바 애플리케이션의 쓰레드(Thread) 덤프를 뜰 수 있도록 도와주는 도구 입니다. 자바 애플리케이션의 쓰레드의 상태를 상세히 알 수 있어서 자바 애플리케이션의 프로파일링을 할 수 있고 이를 통해서 성능을 개선할 수 있습니다. 예를들면 다음과 같습니다.
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2015-01-21 21:11:12 Full thread dump OpenJDK 64-Bit Server VM (23.25-b01 mixed mode): "Attach Listener" daemon prio=10 tid=0x00007fa830001000 nid=0x3c5a waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "ajp-bio-8309-AsyncTimeout" daemon prio=10 tid=0x00007fa85ca18000 nid=0x2e47 waiting on condition [0x00007fa8508f4000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java:152) at java.lang.Thread.run(Thread.java:701) Locked ownable synchronizers: - None "ajp-bio-8309-Acceptor-0" daemon prio=10 tid=0x00007fa85ca16000 nid=0x2e46 runnable [0x00007fa8509f5000] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375) at java.net.ServerSocket.implAccept(ServerSocket.java:478) at java.net.ServerSocket.accept(ServerSocket.java:446) at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60) at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220) at java.lang.Thread.run(Thread.java:701) Locked ownable synchronizers: - None "http-bio-8380-AsyncTimeout" daemon prio=10 tid=0x00007fa85ca13800 nid=0x2e45 waiting on condition [0x00007fa850af6000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java:152) at java.lang.Thread.run(Thread.java:701) Locked ownable synchronizers: - None "http-bio-8380-Acceptor-0" daemon prio=10 tid=0x00007fa85ca12000 nid=0x2e44 runnable [0x00007fa850bf7000] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375) at java.net.ServerSocket.implAccept(ServerSocket.java:478) at java.net.ServerSocket.accept(ServerSocket.java:446) at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60) at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220) at java.lang.Thread.run(Thread.java:701) Locked ownable synchronizers: - None "ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=10 tid=0x00007fa85ca0f800 nid=0x2e43 waiting on condition [0x00007fa850cf8000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1513) at java.lang.Thread.run(Thread.java:701) Locked ownable synchronizers: - None "GroupChannel-Heartbeat-1" daemon prio=10 tid=0x00007fa85ca0b800 nid=0x2e40 waiting on condition [0x00007fa85100d000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.catalina.tribes.group.GroupChannel$HeartbeatThread.run(GroupChannel.java:689) Locked ownable synchronizers: - None "Tribes-MembershipSender" daemon prio=10 tid=0x00007fa85ca0a000 nid=0x2e3e waiting on condition [0x00007fa85110e000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.catalina.tribes.membership.McastServiceImpl$SenderThread.run(McastServiceImpl.java:580) Locked ownable synchronizers: - None "Tribes-MembershipReceiver" daemon prio=10 tid=0x00007fa85ca08800 nid=0x2e3d runnable [0x00007fa85120f000] java.lang.Thread.State: RUNNABLE at java.net.PlainDatagramSocketImpl.receive0(Native Method) - locked <0x00000000a5730da0> (a java.net.PlainDatagramSocketImpl) at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:136) - locked <0x00000000a5730da0> (a java.net.PlainDatagramSocketImpl) at java.net.DatagramSocket.receive(DatagramSocket.java:759) - locked <0x00000000a5803e80> (a java.net.DatagramPacket) - locked <0x00000000a5803e48> (a java.net.MulticastSocket) at org.apache.catalina.tribes.membership.McastServiceImpl.receive(McastServiceImpl.java:339) at org.apache.catalina.tribes.membership.McastServiceImpl$ReceiverThread.run(McastServiceImpl.java:533) Locked ownable synchronizers: - None "NioReceiver" daemon prio=10 tid=0x00007fa85c9da800 nid=0x2e3c runnable [0x00007fa851310000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method) at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:228) at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:83) at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87) - locked <0x00000000a57ca768> (a sun.nio.ch.Util$1) - locked <0x00000000a57ca758> (a java.util.Collections$UnmodifiableSet) - locked <0x00000000a57ca710> (a sun.nio.ch.EPollSelectorImpl) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98) at org.apache.catalina.tribes.transport.nio.NioReceiver.listen(NioReceiver.java:283) at org.apache.catalina.tribes.transport.nio.NioReceiver.run(NioReceiver.java:433) at java.lang.Thread.run(Thread.java:701) Locked ownable synchronizers: - None "GC Daemon" daemon prio=10 tid=0x00007fa85c934000 nid=0x2e38 in Object.wait() [0x00007fa85183a000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000a55cc360> (a sun.misc.GC$LatencyLock) at sun.misc.GC$Daemon.run(GC.java:117) - locked <0x00000000a55cc360> (a sun.misc.GC$LatencyLock) Locked ownable synchronizers: - None "Low Memory Detector" daemon prio=10 tid=0x00007fa85c0fa000 nid=0x2e36 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "C2 CompilerThread1" daemon prio=10 tid=0x00007fa85c0f8000 nid=0x2e35 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "C2 CompilerThread0" daemon prio=10 tid=0x00007fa85c0f5000 nid=0x2e34 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Signal Dispatcher" daemon prio=10 tid=0x00007fa85c0f2800 nid=0x2e33 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Finalizer" daemon prio=10 tid=0x00007fa85c0a4000 nid=0x2e32 in Object.wait() [0x00007fa85254c000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000a57188a8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:133) - locked <0x00000000a57188a8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:149) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189) Locked ownable synchronizers: - None "Reference Handler" daemon prio=10 tid=0x00007fa85c0a2000 nid=0x2e31 in Object.wait() [0x00007fa85264d000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000a57ff5a0> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133) - locked <0x00000000a57ff5a0> (a java.lang.ref.Reference$Lock) Locked ownable synchronizers: - None "main" prio=10 tid=0x00007fa85c009000 nid=0x2e2b runnable [0x00007fa86611b000] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375) at java.net.ServerSocket.implAccept(ServerSocket.java:478) at java.net.ServerSocket.accept(ServerSocket.java:446) at org.apache.catalina.core.StandardServer.await(StandardServer.java:453) at org.apache.catalina.startup.Catalina.await(Catalina.java:777) at org.apache.catalina.startup.Catalina.start(Catalina.java:723) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:622) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:321) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455) Locked ownable synchronizers: - None "VM Thread" prio=10 tid=0x00007fa85c093000 nid=0x2e30 runnable "GC task thread#0 (ParallelGC)" prio=10 tid=0x00007fa85c016800 nid=0x2e2c runnable "GC task thread#1 (ParallelGC)" prio=10 tid=0x00007fa85c018800 nid=0x2e2d runnable "GC task thread#2 (ParallelGC)" prio=10 tid=0x00007fa85c01a000 nid=0x2e2e runnable "GC task thread#3 (ParallelGC)" prio=10 tid=0x00007fa85c01c000 nid=0x2e2f runnable "VM Periodic Task Thread" prio=10 tid=0x00007fa85c105000 nid=0x2e37 waiting on condition JNI global references: 127 |
문제는 이렇게 jstack 의 결과을 보면 당시 쓰레드에 OS 의 자원사용량을 알 방법이 없습니다. OS의 자원이라고 하면 CPU, MEM 등과 같은 것입니다. jstack 의 결과에는 tid 라고 해서 Thread ID 가 헥사(16 진수)로 표시됩니다. 이는 OS상에서 자바 애플리케이션의 쓰레드의 PID 를 가리킵니다. 그래서 jstack […]