Java Services cpu100% resolution sharing

Updated: May 01, 2024 07:37:28 Author: Qian Yun

A recent task is to optimize an export function, but click on the function found that the program for a long time no reaction, after a period of time there is a reaction, by viewing the monitoring of the service found that the service cpu continues to 100% of the situation, the following share my processing plan and process, the need of friends can refer to

catalogue

backdrop

A recent task is to optimize an exported function, but click on the function found that the program for a long time no reaction, after a period of time there is a reaction, by viewing the monitoring of the service found that the service cpu continues to 100% of the situation, the following share my processing plan and process

Processing process

1. Program cpu monitoring chart

2. Locate the situation where the cpu usage is found to be 100%, but problems exist on both nodes. In this case, check the cpu status

a. Log in to the server and run the top command to check the cpu usage

-- This image is not 100% screenshot

b. Run the to-hp [pid] command to check the cpu usage of a thread

We can see that 506 and 856 are higher

c. Execute printf "%x\n" [thread id] to convert the thread id into hexadecimal, and +0x before the prefix, the purpose is to find the corresponding thread specific information in the thread log, the highest cpu when I got the thread hexadecimal 0x1a8

d. Run jstack [pid] > jstack.txt

e. Run 0x1a8 obtained in step c to query jstack.txt

The thread log found that this thread is actually a GC thread, which means that the existence of fullgc caused the cpu to continue to be too high, and fullgc is caused by large objects, which thinks that there are large objects in the system.

f. Check the memory status of the jvm

A large object was found on the memory snapshot

g. View program logs

The timing task was found to be running, and the same class as the large object was found in the class

e. Find the cause. The scheduled task queries more than 200,000 pieces of data to the object at one time, causing the fullgc to shut down the scheduled task, and the service recovers

peroration

The reason for this problem is that fullgc causes the cpu usage to be too high, and many of the exceptions of high cpu are occasional, so it is not easy to troubleshoot, because basically you can only see which threads are faulty when 100% occurs.

The above is the Java service cpu100% solution process to share the details, more information about Java service cpu100% please pay attention to other related articles Script home!

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