Find out how a process in a Tomcat program consumes high CPU

First, the problem found

In a test or production environment, when the Tomcat CPU is found to remain at a certain high level, the program processing is definitely out of the question, the next step is to find out why. The following figure shows that tomcat with a process ID of 8051 occupies a high CPU.

second, positioning problems

Use the command ps-mp 8051-o thread,tid,time to see which threads in this process use a higher CPU, and browse to view thread 8327 that is taking up more CPU.

Convert the required thread ID to 16 binary format

Use the command printf "%x\n" tid, as shown below

Print thread stack information

Using the command jstack PID |grep tid-a 60, view the stack information as shown in the location of the program

4. Modify the program, test and re-release it.