jstack -F解析-未完待续
jstack -F 74926
Attaching to process ID 74926, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.171-b11 Deadlock Detection: No deadlocks found. Thread 10703: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Interpreted frame) - java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=442 (Compiled frame) - org.apache.zookeeper.ClientCnxn$EventThread.run() @bci=9, line=504 (Interpreted frame) Thread 10702: (state = IN_NATIVE) - sun.nio.ch.EPollArrayWrapper.epollWait(long, int, long, int) @bci=0 (Compiled frame; information may be imprecise) - sun.nio.ch.EPollArrayWrapper.poll(long) @bci=18, line=269 (Compiled frame) - sun.nio.ch.EPollSelectorImpl.doSelect(long) @bci=28, line=93 (Compiled frame) - sun.nio.ch.SelectorImpl.lockAndDoSelect(long) @bci=37, line=86 (Compiled frame) - sun.nio.ch.SelectorImpl.select(long) @bci=30, line=97 (Compiled frame) - org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(int, java.util.List, java.util.LinkedList, org.apache.zookeeper.ClientCnxn) @bci=6, line=349 (Compiled frame) - org.apache.zookeeper.ClientCnxn$SendThread.run() @bci=654, line=1141 (Interpreted frame) Thread 10198: (state = BLOCKED) Thread 75943: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Compiled frame) Thread 75941: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Compiled frame) Thread 75939: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75937: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75935: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75933: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75931: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75929: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75927: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75925: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75918: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75916: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75914: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75912: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75910: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame) Thread 75908: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may be imprecise) - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=175 (Compiled frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await() @bci=42, line=2039 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=24, line=1081 (Compiled frame) - java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take() @bci=1, line=809 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=149, line=1074 (Compiled frame) - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) @bci=26, line=1134 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=624 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=748 (Interpreted frame)
jstack -F强制模式的线程堆栈相比非强制模式可读性可要差多了（主要在非强制模式无法dump的情况下采用）。从上可知，jstack强制模式的线程堆栈跟普通模式差异非常大，甚至很多状态看起来完全就不正确，比如BLOCKED，及很多bci。后面找时间仔细研究下。
非强制模式的jstack如下：
[aoptest@ta5host ~]$ more 74926.txt 2020-03-05 22:28:54 Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.171-b11 mixed mode): "main-EventThread" #332 daemon prio=5 os_prio=0 tid=0x00007f1bc4017000 nid=0x29cf waiting on condition [0x00007f1da46ed000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000006a65116e8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:504) "main-SendThread(pm1:2191)" #331 daemon prio=5 os_prio=0 tid=0x00007f1bc400c800 nid=0x29ce runnable [0x00007f1dd4668000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method) at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269) at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93) at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) - locked <0x00000006a6500120> (a sun.nio.ch.Util$3) - locked <0x00000006a6500110> (a java.util.Collections$UnmodifiableSet) - locked <0x00000006a64ffff8> (a sun.nio.ch.EPollSelectorImpl) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:349) at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141) "Attach Listener" #330 daemon prio=9 os_prio=0 tid=0x00007f1cc4001000 nid=0x27d6 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "monitorTaskExecutor-30" #294 prio=5 os_prio=0 tid=0x00007f1a5c054800 nid=0x128a7 waiting on condition [0x00007f1da48f1000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000004523a5d58> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1081) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
对于非强制模式，一般是top -Hp PID找到当前cpu最高的线程，然后将10进制线程号转为16进制，再grep，如下：
jstack 11957 | grep -A100 "37d1"
"DubboServerHandler-10.20.25.225:7789-thread-80" #221 daemon prio=5 os_prio=0 tid=0x00007f1890d8a800 nid=0x37d1 waiting on condition [0x00007f17e126a000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x000000064216a808> (a java.util.concurrent.SynchronousQueue$TransferStack) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:458) at java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362) at java.util.concurrent.SynchronousQueue.take(SynchronousQueue.java:924) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) "DubboServerHandler-10.20.25.225:7789-thread-79" #220 daemon prio=5 os_prio=0 tid=0x00007f1892079000 nid=0x37d0 waiting on condition [0x00007f17e12e9000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at com.hundsun.ta.aop.config.service.DynamicGendataServiceImpl.genData(DynamicGendataServiceImpl.java:153) at com.hundsun.ta.aop.config.service.DynamicGendataServiceImpl$$FastClassBySpringCGLIB$$6dafbed0.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:736) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:56) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.aspectj.AspectJAfterAdvice.invoke(AspectJAfterAdvice.java:47) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
但是这有个不便之处，就是等你top，grep完，已经不是那个线程最繁忙了。
park/unpark的来由参见LockSupport工具类详解。
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