How to check CPU utilisation in linux?

**How to check CPU utilisation in Linux?**

CPU utilisation is an essential metric to monitor the performance of a Linux system. By understanding how much of the CPU’s processing power is being used, you can identify resource-intensive processes, optimize system performance, and troubleshoot potential bottlenecks. In this article, we will explore various methods to check CPU utilisation in Linux.

1. How can I use the top command to check CPU utilisation?

You can use the `top` command in Linux to display real-time CPU utilisation. Simply run `top` in the terminal, and the CPU utilisation will be shown as a percentage in the summary section.

2. What if I want to see the CPU usage of specific processes?

To see the CPU usage of specific processes, use the `top` command with the `-p` flag followed by the process IDs. For example, `top -p 1234 5678` will display CPU utilisation for processes with IDs 1234 and 5678.

3. How can I view CPU utilisation in a graphical format?

If you prefer a graphical representation, you can use a tool like `htop` or `gnome-system-monitor` to check CPU utilisation. These tools provide a user-friendly interface that displays CPU usage and other system metrics in a graphical format.

4. Is there a command-line option to check CPU utilisation in real-time?

Yes, the `sar` command allows you to monitor CPU utilisation in real-time. Running `sar -u 1` will display CPU usage every second, providing a detailed view of how the CPU is being utilized.

5. Can I check the historical CPU utilization using the sar command?

Absolutely! The `sar` command can also retrieve historical CPU utilisation data. For example, running `sar -u -f /var/log/sa/sa01` will display CPU utilisation for a specific day (sa01 file).

6. How can I check CPU utilisation using the /proc file system?

The `/proc/stat` file in the Linux file system provides information about CPU utilisation. By reading the contents of this file, you can parse the data and calculate the CPU usage manually.

7. Is there a command-line tool to display CPU utilisation as a bar graph?

Yes, the `dstat` command can be utilized to display CPU utilisation as a bar graph. Running `dstat -c` will show a continuously updating bar graph, making it easier to visualize percentage utilisation.

8. Can I check CPU utilisation using a specific interval?

Yes, the `mpstat` command allows you to specify an interval for monitoring CPU utilisation. For instance, running `mpstat 5` will display CPU usage every five seconds.

9. How can I monitor CPU utilisation using a web-based interface?

You can use tools like `Glances` or `Netdata` to monitor CPU utilisation through a web-based interface. These tools provide comprehensive system information, including CPU usage, in a visually appealing way.

10. What if I want to check CPU utilisation on a remote Linux server?

If you need to check CPU utilisation on a remote Linux server, you can use tools like `top` or `htop` with SSH. Simply SSH into the remote server and run the desired command to view the CPU utilisation.

11. Are there any dedicated command-line tools to monitor CPU utilisation?

Yes, there are several dedicated command-line tools available for monitoring CPU utilisation, such as `cpustat`, `nmon`, and `sysstat`. These tools provide detailed information about CPU usage and system performance.

12. Can I check CPU utilisation using a GUI without installing additional tools?

Yes, Linux distributions often come with built-in system monitors that display CPU utilization and other system resources. GNOME system monitor, KDE system monitor, and Xfce task manager are some common examples that provide CPU utilisation information without requiring additional tool installation.

In conclusion, monitoring CPU utilisation is crucial for maintaining optimal system performance. By utilizing command-line tools, GUI options, or parsing system files, you can easily determine CPU utilization and take appropriate actions to enhance your Linux system’s efficiency.

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