Chapter 10 Install and System Administration for FortiOS 5.0 : Using the web-based manager : Dashboard : System Resources widget
  
System Resources widget
The System Resources widget displays basic FortiGate unit resource usage. This widget displays the information for CPU and memory in either real-time or historical data. For FortiGate units with multiple CPUs, you can view the CPU usage as an average of all CPUs or each one individually.
This widget also is where you reboot or shutdown the FortiGate unit.
 
The options to reboot or shutdown the FortiGate unit are not available for an admin using the prof_admin profile.
Use the Refresh icon when you want to view current system resource information, regardless of whether you are viewing real-time or historical type format.
To change the resource view from real-time to historical, or change the CPU view (for multiple CPU FortiGate units), select the Edit icon (visible when you hover the mouse over the widget).
When viewing CPU and memory usage in the web-based manager, only the information for core processes displays. CPU for management processes, is excluded. For example, HTTPS connections to the web-based manager.