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This article mainly shows you "how to troubleshoot Java programs that occupy a high CPU under Linux", which is easy to understand and clear, hoping to help you solve your doubts. Let the editor lead you to study and learn this article "how to troubleshoot Java programs that occupy a high CPU under Linux".

Jstack is a stack trace tool that comes with the java virtual machine. Jstack is used to print out the Java stack information for a given java process ID or core file or remote debugging service.

Deliberately set up a scene with a high CPU footprint:

To troubleshoot the problem, steps:

\ 1. Ps-mp [replace with process ID PID]-o THREAD,tid,time

It is found that threads 6322 and 6323 take up a high amount of CPU and take a long time.

\ 2. Printf "% x" [thread ID TID]

Convert TID to hexadecimal.

\ 3. Jstack [process ID PID] | grep [thread ID hexadecimal]-A 10-B 10

Using the jstack tool, look at the front and back 10 lines to find the problem!

Intentionally set in the code:

\ 4. Repeat 2 and 3 to see another thread.

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Appendix: to access your own Virtual Box, the network settings should be adjusted to:

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