Menu
I'm looking at implementing a tool that looks at CPU usage on my Mac, similar to Activity Monitor, but I'm using the numbers in a calculation. I need to be able to get the CPU usage at 0.5 second intervals or so. What API does Activity Monitor use? Is it documented somewhere?
I'd rather not parse the output of command line programs if that's avoidable.
913
The Energy pane of Activity Monitor is your Mac's resource monitor. It shows overall energy use and power used by each app. You'll see the Energy Impact of running apps, along with the Avg Energy Impact of each app over the last 12 hours or since your Mac booted up, whichever is shorter.
Every copy of macOS has the Activity Monitor app installed in it. Like the Task Manager in Windows, Activity Monitor lets you see everything that's running on your Mac. This includes apps that you can open and quit as normal, but it also includes background processes, which you don't normally see.
The user named root, or superuser, is a special user account in UNIX-like operating systems that has unrestricted read and write privileges to all areas of the file system in OS X 10.10 or earlier.
Look for any suspicious processes that are running on your Mac. On the menu bar, click Go, and then select Utilities. Double-click Activity Monitor. Review the list for any processes that look suspicious to investigate further.
You could probably find out by looking at the source for the Darwin version of the top command.
http://www.opensource.apple.com/source/top/top-73/libtop.c
This looks like it might be useful...
static kern_return_t libtop_pinfo_update_cpu_usage(task_t task, libtop_pinfo_t* pinfo, int *state)
54
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
