virt-manager:tldr:44684

The command "virt-manager --show-domain-performance ${select}" is used to display the performance information of a virtual machine in virt-manager.

• "virt-manager" is a graphical user interface (GUI) application used to manage virtual machines on the Linux platform.
• "--show-domain-performance" is an option or flag that tells virt-manager to display the performance information of a virtual machine.
• "${select}" is a placeholder for the name or ID of a specific virtual machine that you want to view performance information for.

By executing this command and providing the name or ID of a virtual machine after the "--show-domain-performance" option, virt-manager will open a window or display a separate tab showing various performance metrics for that particular virtual machine. These metrics may include CPU usage, memory usage, network traffic, disk I/O, etc., allowing you to monitor and assess the performance of the virtual machine.