How to troubleshoot Java programs that occupy a high level of CPU under Linux
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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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