How to check CPU utilization in Linux command?

Checking CPU Utilization in Linux: A Comprehensive Guide

Introduction

In today’s world, CPU utilization is a crucial aspect of system performance. It measures the percentage of CPU time spent by the operating system and other applications. A high CPU utilization can lead to slow system performance, freezes, and even system crashes. In this article, we will explore the various ways to check CPU utilization in Linux.

Method 1: Using top Command

The top command is a built-in Linux utility that displays a list of running processes, including their CPU usage. Here’s how to use it:

• Open a terminal and type top to display the current system status.
• The top command will display a list of processes, including their CPU usage.
• To view only the CPU usage, use the -u option followed by the process ID (PID) of the process you want to view.
• For example, to view the CPU usage of the chrome process, type top -u 1234.

CPU Utilization	Description
0-10%	Normal CPU usage
11-20%	Moderate CPU usage
21-30%	High CPU usage
31-40%	Very high CPU usage
41-50%	Extremely high CPU usage

Method 2: Using htop Command

The htop command is a more advanced tool that provides a more detailed view of CPU usage. Here’s how to use it:

• Open a terminal and type htop to display the current system status.
• The htop command will display a list of processes, including their CPU usage.
• To view only the CPU usage, use the -u option followed by the process ID (PID) of the process you want to view.
• For example, to view the CPU usage of the chrome process, type htop -u 1234.

CPU Utilization	Description
0-10%	Normal CPU usage
11-20%	Moderate CPU usage
21-30%	High CPU usage
31-40%	Very high CPU usage
41-50%	Extremely high CPU usage

Method 3: Using ps Command

The ps command is a powerful tool that provides detailed information about running processes. Here’s how to use it:

• Open a terminal and type ps -eo pid,comm,etimes to display a list of running processes, including their PID, process name, and CPU usage.
• To view only the CPU usage, use the -o option followed by the etimes column.
• For example, to view the CPU usage of the chrome process, type ps -eo pid,comm,etimes.

CPU Utilization	Description
0-10%	Normal CPU usage
11-20%	Moderate CPU usage
21-30%	High CPU usage
31-40%	Very high CPU usage
41-50%	Extremely high CPU usage

Method 4: Using top -H Command

The top -H command is similar to the top command, but it displays a list of processes in a more human-readable format.

• Open a terminal and type top -H to display the current system status.
• The top -H command will display a list of processes, including their CPU usage.
• To view only the CPU usage, use the -u option followed by the process ID (PID) of the process you want to view.
• For example, to view the CPU usage of the chrome process, type top -H -u 1234.

CPU Utilization	Description
0-10%	Normal CPU usage
11-20%	Moderate CPU usage
21-30%	High CPU usage
31-40%	Very high CPU usage
41-50%	Extremely high CPU usage

Method 5: Using htop -H Command

The htop -H command is similar to the htop command, but it displays a list of processes in a more human-readable format.

• Open a terminal and type htop -H to display the current system status.
• The htop -H command will display a list of processes, including their CPU usage.
• To view only the CPU usage, use the -u option followed by the process ID (PID) of the process you want to view.
• For example, to view the CPU usage of the chrome process, type htop -H -u 1234.

CPU Utilization	Description
0-10%	Normal CPU usage
11-20%	Moderate CPU usage
21-30%	High CPU usage
31-40%	Very high CPU usage
41-50%	Extremely high CPU usage

Conclusion

Checking CPU utilization in Linux is a crucial aspect of system performance. By using the top, htop, ps, and htop -H commands, you can easily check the CPU utilization of your system and identify any potential issues. Remember to always monitor your system’s CPU utilization to ensure optimal performance.

Additional Tips

• To view the CPU utilization of all running processes, use the top command with the -u option followed by the --sort option.
• To view the CPU utilization of a specific process, use the ps command with the -o option followed by the etimes column.
• To view the CPU utilization of a specific process in real-time, use the htop command with the -u option followed by the process ID (PID) of the process you want to view.

By following these tips and using the various methods outlined in this article, you can easily check your CPU utilization in Linux and ensure optimal system performance.