The following command will display extended statistics (-x), the number of times (-t) each report should be displayed for CPU utilization (-c). The following command will break the CPU utilization into user processes, system processes, I/O wait and idle time. To list the individual report use -c, -d and -h switch for CPU utilization, device utilization and network file system utilization. Running the following command without any options displays all three reports. This utility display system’s average CPU utilization since the last reboot. The iostat command list CPU utilization, device utilization and network file system utilization. 'U' to view processes owned by a specific user.'S' to sort by how long the processes have been running type.'I' to remove the idle processes from the display and to revert back press 'I' again.To modify the output of top command, press: Type 'top' from the terminal to view the statistical data related to the performance of a system. By default, the top command updates data every 5 seconds. The top command displays a real-time view of performance-related data of all running processes in a system. In this tutorial, learn some of the useful command-line tools to check CPU usage and their usage in Linux-based distros. Operating systems have built-in system calls which these tools rely on to extract the performance readings. There are a lot of tools available to monitor and display CPU performance. Monitoring the performance of the CPU is essential to debug processes inside any system, manage system resources, make system decisions, and evaluate and examine systems in real-time. CPU performance is one aspect of measuring the performance of a system.
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