Shulou(Shulou.com)06/02 Report--

Command how to troubleshoot multithreading problems, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

This is a previous deadlock case:

A multi-thread deadlock case, how to avoid and solve the deadlock problem?

If such a deadlock occurs in the program, how to troubleshoot it? We can use the jstack command that comes with java to troubleshoot.

1. First run the above deadlock example on the server to make the program fall into a deadlock.

2. Use jps and ps-ef | grep java to view the pid of the current java process. In serious cases, you can use the top command to view the process pid with the highest memory usage of the current system cpu/.

Here our deadlock pid is: 3429, here the program is very simple, although the program deadlock, does not take up a lot of resources.

3. Use the top-Hp 3429 command to view the threads that take up the most resources in the process.

The thread that we see here takes up the most resources: 3440.

4. Use the command printf "% x\ n" 3440 to convert the thread pid to a hexadecimal number, and get: D70.

5. Use the command jstack 3429 | grep-20 D70 to query where the thread is blocked.

This is basically the end of the trace, go to the code line to see why the deadlock.

After reading the above, have you mastered the command how to troubleshoot multithreading problems? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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