Troubleshooting and positioning of CPU usage on Java line

The recent online frequent alarm CPU idle, so after emergency troubleshooting to share to everyone

1. Use the top command to get the highest CPU-intensive process number

2. View process information for thread number

Command: Ps-ef|grep 22630

3. View thread information for the process

Command: Ps-mp22630-othread,tid,time | sort-nr| Head-15

4, select the first thread number, converted to 16 binary

Command: printf "%x" 22657

Results: 5881

5, use Jstack to query out the specific thread state

Command: Jstack 22630|grep 5881-a 30

With these thread states you can basically locate the problem

Troubleshooting and positioning of CPU usage on Java line