定位问题——终端环境下使用jstack分析jvm

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定位问题——终端环境下使用jstack分析jvm
我的github pages 地址：https://alexanderwangsgithub.github.io/
终端环境下使用jstack分析jvm(现在一般在Framwork层集成trace)

一般来说，解决问题先看log，再看stack。

jstack定向dump文件

jps |grep Main|awk '{print $1}'|xargs -t jstack >dump1

统计所有线程状态

grep java.lang.Thread.State dump1|awk '{print $2$3$4$5}'| sort | uniq -c

结果如下：

    222 RUNNABLE      5 TIMED_WAITING(onobjectmonitor)     10 TIMED_WAITING(parking)      2 TIMED_WAITING(sleeping)      3 WAITING(onobjectmonitor)    257 WAITING(parking)

打开dump查看257 WAITING(parking)

"thread_async_mq_producer27" #565 prio=10 os_prio=0 tid=0x00007f9fb0009000 nid=0x669a waiting on condition [0x00007f9f3326c000]   java.lang.Thread.State: WAITING (parking)    at sun.misc.Unsafe.park(Native Method)    - parking to wait for  <0x00000006c8e45a08> (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 java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)    at java.lang.Thread.run(Thread.java:745)

调用量太低，线程组处于闲置

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