Java thread high CPU usage analysis method

Methods and steps to analyze the high CPU usage of Java threads:

1) To view the CPU occupancy rate TOP10 PID

[Root@qipsuit1 ~]# Ps-aux | Sort-k3nr | head-10
Warning:bad syntax, perhaps a bogus '-'? See/usr/share/doc/procps-3.2.8/faq
root     30428  1.3 12513592 430904 pts/7 Sl   14:20 135:35 java -djava.ext.dirs=/qip/run/app/qip-collector/-jar

2 Display the list of threads and sort by CPU-intensive threads

[Root@qipsuit1 ~]# ps-mp 30428-o thread,tid,time | Sort-rn
user     %cpu PRI SCNT wchan  user SYSTEM   TID     time
root     99.9         -      -30932 01:08:18
Root 99.8---      30933 01:08:18

3 converts the required thread ID to a 16-in format

[Root@qipsuit2 ~]# printf "%x\n" 30932
78d4
[root@qipsuit1 ~]# printf "%x\n" 30933
78d5

4) View Stack

[root@qipsuit1 ~]# jstack 30428 |grep 78d4-a "Thread-15" prio=10 tid=0x00007fa28c058800 nid= 0x78d4 runnable [0x00007fa3a8e49000] Java.lang.Thread.State:RUNNABLE at COM.GTSTAR.COLLECTOR.THREAD.MSGSAVETHR Ead.run (msgsavethread.java:68) at Java.lang.Thread.run (thread.java:745) "Thread-13" prio=10 tid=0x00007fa28c05680 0 nid=0x78d3 waiting on condition [0x00007fa3a8f4a000] Java.lang.Thread.State:TIMED_WAITING (sleeping) at Java . lang.
        Thread.Sleep (Native method) at Com.gtstar.collector.thread.MemoryMsgSaveThread.run (memorymsgsavethread.java:33) At Java.lang.Thread.run (thread.java:745) 

[Root@qipsuit1 ~]# jstack 30428 |grep 78d5-a
' Thread-17 ' prio=10 tid=0x00007fa28c05b000 nid=0x78d5 runnable [0x000 07FA3A8D48000]
   Java.lang.Thread.State:RUNNABLE at
        Com.gtstar.collector.thread.AckMsgSaveThread.run ( ackmsgsavethread.java:66) at
        Java.lang.Thread.run (thread.java:745)

"Thread-15" prio=10 tid= 0x00007fa28c058800 nid=0x78d4 runnable [0x00007fa3a8e49000]
   Java.lang.Thread.State:RUNNABLE
        at Com.gtstar.collector.thread.MsgSaveThread.run (msgsavethread.java:68) at
        Java.lang.Thread.run (Thread.java : 745)

Watch the red part.