atop:tldr:24b7d

The "atop" command is a Linux utility used to monitor the system's performance in real time. It provides detailed information about various system resources, including CPU usage, memory usage, disk I/O, network activity, and more.

When you run the "atop" command, it displays a continuously updating screen of statistics and metrics related to different system components. By default, it shows the CPU-related statistics, such as individual CPU utilization, load average, and process information.

Here's a breakdown of some commonly used keys while atop is running:

• "q": Quit the atop utility.
• "C": Sort the processes based on the CPU utilization.
• "M": Sort the processes based on memory utilization.
• "D": Sort the processes based on disk activity.
• "n": Change the number of iterations per second.
• "d": Toggle disk activity display.
• "N": Toggle network activity display.

Besides the interactive mode, atop also has several command-line options that allow you to generate reports and logs. You can redirect the output to a file, specify the interval at which statistics are collected, customize the display, and more.

Overall, atop is a powerful tool for analyzing system performance and troubleshooting performance issues, providing a comprehensive overview of the system's resource usage.