The first step: you need to recognize the activity monitor in the diagram below, which is an OS X self-contained system application that can be used to monitor processor activity, hard disk usage, virtual memory, and network activity and application state.
Step Two: Open the Activity Monitor, and you can decide for yourself if you want to minimize it to the Dock.
The third step: right now minimized to the Dock in the icon, select "Monitor", you can see these options if you click "Show CPU Usage", the desktop will jump out of a small window to display separately.
Fourth step: The emphasis is on, select the function in the "Dock icon", the icon in the dock will be directly replaced by the display of the graphic display is very vivid and understandable, in the process of identifying them should not encounter any difficulties.
Fifth step: Complete.