Monitoring Linux CPU Usage with the `display cpu-usage` Command

When it comes to monitoring system performance, understanding CPU usage is crucial. In Linux, the `display cpu-usage` command provides an efficient way to track and analyze CPU utilization. This article will explore the various options available with this command and demonstrate how to use them effectively.

By default, the `display cpu-usage` command displays statistics for all processes on all CPUs without specifying any specific options. However, you can customize your output by specifying a process ID (PID), a CPU number, or even a card slot.

To specify a process, use the `job job-id` option followed by the PID of the process you want to monitor. For instance, if you want to track the CPU usage of a specific process with an ID of 1234, type `display cpu-usage history job 1234`. This command will display the CPU usage statistics for that particular process.

If you want to focus on a specific CPU, use the `cpu cpu-number` option. For example, `display cpu-usage history cpu 0` will show you the CPU usage statistics for CPU 0.

When monitoring multiple CPUs or cards, you can specify the card slot number using the `slot slot-number` option. For instance, `display cpu-usage history slot 1` will display the CPU usage statistics for the processes running on card slot 1.

In addition to these options, you can also use the `chassis chassis-number` and `hassis chassis-number slot slot-number` options to specify an IRF (Intelligent Resilient Framework) member device or a specific card on that device.

To view the IDs and names of running processes, use the `display process` command. This will provide you with a list of currently running processes, making it easier to identify the process you want to monitor.

The `display cpu-usage history` command also allows you to view historical CPU usage statistics in a coordinate system. To do this, simply type `display cpu-usage history` without any additional options. This will display a graph showing the CPU usage over time, allowing you to analyze trends and identify patterns.

In summary, the `display cpu-usage` command is a powerful tool for monitoring Linux CPU usage. By specifying process IDs, CPUs, cards, or IRF member devices, you can customize your output to suit your specific needs. Whether you're troubleshooting performance issues or simply want to monitor system activity, this command provides valuable insights into your system's CPU utilization.

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