Use of jstack

quote ：https://blog.csdn.net/mynamepg/article/details/81702075

One 、jstack Command parameter

Two 、jstack solve the problem

1、 A dead cycle leads to cpu soar

Examples of dead cycles ：https://blog.csdn.net/goldenfish1919/article/details/8755378

step ： Find the process -》 Lookup thread -》 analysis threadDump journal -》 Find out the problem code

a、 see cpu high java process

 top

b、 Generate stack logs for all threads under the process

 jstack 1721 > 1712.txt

c、 Check which threads in the process occupy a high cpu

top -p 1712 -H

d、 Put the decimal system pid Convert to hexadecimal pid

printf “%x” 8247

2037

2、 Deadlock problem location

3、thread dump Log analysis

jstack：
https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jstack.html
java State of thread
https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr034.html
java Thread state transformation ：
https://mp.weixin.qq.com/s/GsxeFM7QWuR–Kbpb7At2w
https://blog.csdn.net/mynamepg/article/details/81630487
A dead cycle leads to CPU High load
https://blog.csdn.net/goldenfish1919/article/details/8755378
Regular expressions lead to a dead loop ：
https://blog.csdn.net/goldenfish1919/article/details/49123787
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