ACTIVITY MONITOR A guided tour to aid diagnosis
Choose a resource
Switch between the different resource types the app can track using the tabs at the
top of the window. To add extra information to the table, or remove what you don’t need to see, choose items listed under View > Columns, or ≈- click a column header as a quick route to the same options. This enables you to strip the table down to the basics to make diagnosis of a problem a simpler process.
Inspect a process
Activity Monitor refers to apps and background services
as processes. Those that are unresponsive will be red, while black ones are running as expected; graphics or video apps, for example, may turn red while doing something intensive – use your judgment based on what you asked the app to do. Use the search box (top right) to locate specific items, or click a column header to sort based on it.
Quit a process
Quit or force quit a process by selecting it in the table and
clicking this button. However, where possible avoid quitting processes that don’t have your login name in the User column, as they’re core OS X functions. Use the ‘i’ button to find out more about the selected process. Here you can extract a sample of what it’s doing behind the scenes to send to its developer to assist them with debugging.
A visual summary
The graph at the bottom of each tab shows a historical record of the resource being
consumed. The CPU chart is unusual in having two graphs in the same box, showing usage attributed to system and user processes. Red and blue graphs on the Network chart show incoming and outgoing data. In all instances, the most recent measurement is on the right; data scrolls left as later samples are taken.