Investigation and response to excessive CPU and Sys usage in Linux systems

Title: Investigation and response to high CPU and Sys usage in Linux systems

In Linux systems, high CPU and Sys usage is a common problem , may affect system performance and stability. This article will introduce how to diagnose and deal with the problem of high CPU and Sys usage, and give specific code examples.

Problem Analysis

Excessive CPU usage may be due to a process in the system consuming too many computing resources, causing the system load to be too high. High Sys usage may be due to frequent system calls or problems with the kernel module.

Investigation method

Check the system load

You can use the top command or the htop command to check the system load, including CPU Usage, memory usage, and process information.

top

Check the CPU usage

Use the top command or the ps command to check the process with high CPU usage among the currently running processes.

top -c

View Sys calls

Use the strace command to track the system calls of the process and view the frequency and execution time of the system calls.

strace -p <pid>

View the kernel log

View the system's kernel log and check if there are any relevant errors or warnings.

dmesg

Solution

Terminate the process that takes up too much CPU

You can use the kill command to terminate the process that takes up too much CPU.

kill -9 <pid>

Optimize code

Perform performance optimization of processes that occupy too much CPU, reduce the amount of calculation or optimize algorithms.

Upgrade the kernel

Sometimes Sys usage is too high due to kernel module problems. You can try upgrading the kernel and restarting the system.

Adjust system parameters

You can optimize system performance by modifying the parameters in the /proc/sys/ directory, such as adjusting memory allocation, scheduling strategies, etc.

Summary

Through the above methods, we can investigate and respond to the problem of excessive CPU and Sys usage in the Linux system to ensure stable system operation. In actual operations, appropriate investigation methods and processing methods are selected according to specific situations to solve problems in a timely manner and improve system performance and stability.

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