Find the reason why the java process occupies too much CPU under linux
Find the reason why the java process occupies too much CPU under linux
1. Lookup process
Top to check the resource consumption of the process
It is obvious that the two processes of java 22714 dint 12406 take up too much cpu.
two。 Lookup thread
Use top-H-p to view thread occupancy
3. Find stack information for java
Convert thread id to hexadecimal
# printf% x 15664
# 3d30
Then use jstack to query the stack information of the thread
Syntax: jstack | grep-a thread id (hex)
Jstack | grep-a 3d30
In this way, the problematic code has been found.
All that's left is to analyze the cause and modify the code.
