Use the top command to quickly view real-time CPU usage, focusing on observing the %Cpu(s) line; 2. Install htop to obtain a clearer visual interface and support mouse operations; 3. Use mpstat to obtain detailed CPU usage statistics, suitable for analyzing performance trends. These three methods are suitable for rough viewing, intuitive display and in-depth analysis of scenarios.
Want to know how to check the CPU usage of Linux system? In fact, there are many methods, and most of them are built into the system without additional software installation.

Use the top command to quickly view
top
is one of the most commonly used and intuitive ways. Enter at the terminal:

top
You will see a real-time update interface that includes the overall CPU usage and resource usage of each process. Focus on %Cpu(s)
line, which will display the percentage of user state, system state, idle state, etc.
If you just want to see if there is any exception load, this command is the most suitable. Press q
to exit.

Use htop to view more clearly (need to install)
Although top
is very convenient, its interface is a bit simple. If you are willing to install one more tool, htop
is more friendly:
sudo apt install htop # Debian/Ubuntu htop
Not only does it distinguish colors clearly, it can also view the usage of each CPU core through mouse operations, making it more friendly to novices.
If the server is a multi-core CPU, htop
can help you see at a glance whether a certain core is full while others are idle.
Use mpstat to view detailed statistics
If you need to analyze CPU usage trends over a certain period of time, you can use mpstat
. It belongs to the sysstat
toolkit. First, confirm whether it is installed:
mpstat 1 5
The meaning of this command is: sample once per second, and collect five times in total. The results will list the usage details of each CPU, such as %usr
(user state), %sys
(system state), %iowait
(wait for I/O), etc.
This is especially useful for troubleshooting performance issues, such as finding that there are too many system calls or the user program is too resource-consuming.
Basically these are the methods. Different scenarios are suitable for different commands. Usually, you can use top
and mpstat
for detailed analysis. You can also install htop
without losing money if you want to visually experience it.
The above is the detailed content of How to check CPU usage in Linux. For more information, please follow other related articles on the PHP Chinese website!

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