On Mar 5, 2008, at 4:13 PM, Scott.D.R wrote:

As the titled mentioned, How to monitor the system status?
Mac OS X provided a very powerful application "Activity Monitor", which can let you inspect the system status such as CPU usage, disk usage, network usage and so on. But how to retrieve these information using APIs?

Mostly through the sysctl() routines. For an example, see <http://developer.apple.com/qa/qa2001/qa1123.html >.

See the man page, and search for "sysctl" at developer.apple.com for more.

-Ken

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