In Linux, it is found that the CPU usage is too high.

Http://mnt.conf.blog.163.com/blog/static/115668258201211734032988/

First, use the top command to sort by P in descending order of CPU usage

 

 

Then the PS aux | grep PID command can be used to determine whether a problem occurs in Tomcat.

However, to locate a specific thread or code, the following operations are required:
First, display the thread list: PS-mp pid-O thread, tid, time

Found the thread with the highest time consumption of 32720, occupying the CPU for more than half an hour

Then, convert the required thread ID to the hexadecimal format:

Printf "% x \ n" TID

Finally, print the stack information of the thread:

Jstack PID | grep tid-a 60