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HOW TO FIND DIED LOOP

HOW TO FIND DIED LOOP

作者: chenmingang | 来源:发表于2017-05-17 14:05 被阅读24次
    @Test
    public void testLoop() {
        int i = 1;
        while (i == 1) {
            System.out.println(System.currentTimeMillis());
        }
    }
zeal@zeal-pc:~$ jps -mlvV
6641 com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 com.loop.Test,testLoop -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:39892,suspend=y,server=n -ea -Didea.junit.sm_runner -Dfile.encoding=UTF-8

zeal@zeal-pc:~$ top -Hp 6641
top - 10:02:09 up 2 days, 0 min,  1 user,  load average: 3.52, 1.70, 0.90
Threads:  17 total,   1 running,  16 sleeping,   0 stopped,   0 zombie
%Cpu(s): 77.8 us, 13.2 sy,  0.0 ni,  7.6 id,  1.0 wa,  0.0 hi,  0.3 si,  0.0 st
KiB Mem :  7736328 total,   125432 free,  6524184 used,  1086712 buff/cache
KiB Swap:  3905532 total,  1087280 free,  2818252 used.   527408 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND                                                                                                                                                              
 6642 zeal      20   0 3292308 278388   1884 R 74.3  3.6   0:48.55 java                                                                                                                                                                 
 6646 zeal      20   0 3292308 278388   1884 S  0.3  3.6   0:00.08 java                                                                                                                                                                 
 6641 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6643 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.07 java                                                                                                                                                                 
 6645 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.07 java                                                                                                                                                                 
 6647 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.09 java                                                                                                                                                                 
 6654 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.01 java                                                                                                                                                                 
 6655 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6657 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6664 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6665 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6668 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6669 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6670 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.32 java                                                                                                                                                                 
 6671 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.40 java                                                                                                                                                                 
 6672 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.00 java                                                                                                                                                                 
 6673 zeal      20   0 3292308 278388   1884 S  0.0  3.6   0:00.02 java       

CPU 占用最高的线程id 6642 转为16进制 19F2

zeal@zeal-pc:~$ jstack -l 6641
2017-05-17 10:03:59
Full thread dump Java HotSpot(TM) 64-Bit Server VM (24.65-b04 mixed mode):

"Attach Listener" daemon prio=10 tid=0x00007fd690001000 nid=0x1ad8 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"Service Thread" daemon prio=10 tid=0x00007fd6c00b1000 nid=0x1a10 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"C2 CompilerThread1" daemon prio=10 tid=0x00007fd6c00ae800 nid=0x1a0f waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"C2 CompilerThread0" daemon prio=10 tid=0x00007fd6c00ac000 nid=0x1a0e waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"JDWP Command Reader" daemon prio=10 tid=0x00007fd694001000 nid=0x1a0d runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"JDWP Event Helper Thread" daemon prio=10 tid=0x00007fd6c00a9800 nid=0x1a0c runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"JDWP Transport Listener: dt_socket" daemon prio=10 tid=0x00007fd6c00a6000 nid=0x1a09 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"Signal Dispatcher" daemon prio=10 tid=0x00007fd6c0090000 nid=0x1a08 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
    - None

"Finalizer" daemon prio=10 tid=0x00007fd6c0078800 nid=0x1a01 in Object.wait() [0x00007fd6aadcc000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0000000089e045e8> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
    - locked <0x0000000089e045e8> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

   Locked ownable synchronizers:
    - None

"Reference Handler" daemon prio=10 tid=0x00007fd6c0076800 nid=0x19ff in Object.wait() [0x00007fd6aaecd000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0000000089e06858> (a java.lang.ref.Reference$Lock)
    at java.lang.Object.wait(Object.java:503)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
    - locked <0x0000000089e06858> (a java.lang.ref.Reference$Lock)

   Locked ownable synchronizers:
    - None

"main" prio=10 tid=0x00007fd6c0012800 nid=0x19f2 runnable [0x00007fd6c75aa000]
   java.lang.Thread.State: RUNNABLE
    at java.io.FileOutputStream.writeBytes(Native Method)
    at java.io.FileOutputStream.write(FileOutputStream.java:345)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
    - locked <0x0000000089e4f040> (a java.io.BufferedOutputStream)
    at java.io.PrintStream.write(PrintStream.java:482)
    - locked <0x0000000089e06990> (a java.io.PrintStream)
    at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)
    at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)
    at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104)
    - locked <0x0000000089e06920> (a java.io.OutputStreamWriter)
    at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185)
    at java.io.PrintStream.write(PrintStream.java:527)
    - locked <0x0000000089e06990> (a java.io.PrintStream)
    at java.io.PrintStream.print(PrintStream.java:611)
    at java.io.PrintStream.println(PrintStream.java:750)
    - locked <0x0000000089e06990> (a java.io.PrintStream)
    at com.loop.Test.testLoop(Test.java:21)
    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:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)

   Locked ownable synchronizers:
    - None

"VM Thread" prio=10 tid=0x00007fd6c0072000 nid=0x19fe runnable 

"GC task thread#0 (ParallelGC)" prio=10 tid=0x00007fd6c0028000 nid=0x19f3 runnable 

"GC task thread#1 (ParallelGC)" prio=10 tid=0x00007fd6c002a000 nid=0x19f5 runnable 

"GC task thread#2 (ParallelGC)" prio=10 tid=0x00007fd6c002b800 nid=0x19f6 runnable 

"GC task thread#3 (ParallelGC)" prio=10 tid=0x00007fd6c002d800 nid=0x19f7 runnable 

"VM Periodic Task Thread" prio=10 tid=0x00007fd6c00b4000 nid=0x1a11 waiting on condition 

JNI global references: 2440

找到19F2 nid=0x19f2 at com.loop.Test.testLoop(Test.java:21)

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