System Activity (Top)

The Diagnostics > System Activity page displays list of the top active processes running on the firewall. This is equivalent to running the command top -aSH at a shell prompt, except the GUI version does not have the CPU usage summary.

Using this view, it is easy to see processes that consume the most CPU power during a time of high load. For example, if the highest entry is an interrupt processing queue for one of the network cards, and the system isn’t pushing enough traffic, it could be one sign that the firewall is trying to push more than the hardware can handle in the current configuration. If the top process is a PHP process, it could be that a browser has requested a GUI page that is processing a large amount of data.