How to check cpu usage in linux

How to check the CPU usage in Linux: First ensure that the Linux environment can access the Internet and configure the source; then execute the command "apt-get install dstat" to install the software; finally execute the command "dstat -c" Just display the overall CPU status of the system.

During Linux system maintenance, you may need to frequently check the CPU usage and analyze the overall operation of the system. Monitoring CPU performance generally includes the following three points: run queue, CPU usage and context switching. So how to check cpu usage? The following article will give you a detailed introduction, I hope it will be helpful to you. [Video tutorial recommendation: linux tutorial]

1. Use the top command

This command is very commonly used in the terminal Directly execute the top command in the command, you can see the cpu usage in the third line.

Note: 96.9id means idle CPU, that is, the CPU unused rate, 100%-96.9%=3.1%, that is, the system’s CPU usage rate is 3.1%.

If there are multiple CPUs and you want to query the usage of each CPU, you can press the numeric key 1 on the top command interface to see the usage of other CPUs, as shown below:

2. Use the vmstat command

The vmstat command is the most common Linux/Unix monitoring tool, which can display the given The status value of the server in the time interval includes the server's CPU usage, memory usage, virtual memory swapping, and IO reading and writing.

Compared with the top command, you can use vmstat to see the CPU, memory, and IO usage of the entire machine, instead of just seeing the CPU usage and memory usage of each process.

Sentence pattern:

vmstat -w-w

Generally, the use of the vmstat tool is completed through two numerical parameters. The first parameter is the number of sampling intervals in seconds, and the second parameter is is the number of samples. Example:

Description: 2 means collecting server status every two seconds, 1 means collecting only once.

3. Use the dstat command

The dstat command is a tool used to replace the vmstat, iostat, netstat, nfsstat and ifstat commands. It is an all-round system information statistics tool.

If there is no dstat command, you need to download and install it.

First we need to ensure that the Linux environment can access the Internet and configure the source. Log in with the root account. Execute the command apt-get install dstat. Perform software installation.

Then execute the command dstat -c. Displays the overall CPU status of the system.

Displays various information such as CPU user occupancy, system occupancy, idle, waiting, interruption, software interruption and other information.

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