Using getrusage

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Hello Everyone!

As a continuation of this question I'm wondering if I can get some simple sample code as to how to make use of getrusage. I would like to use it to find the time CPU used by a process, ideally from the PID.

I'm working in Cocoa, Objective_C and of course C. Any help would be awesome!

Thanks

I'm not so sure about OS X, but for what it's worth, if this were on Linux it would be a fairly simple matter of reading from a file underneath /proc/<pid>. OS X doesn't seem to have procfs (at least, not standard), though, so this answer will fall into the "any help" category. :)

John Zwinck 2010-08-24 12:05:34

@John. Could you expand on that? Maybe point me in a direction of how exactly I would do what you are saying?

Eric Brotto 2010-08-24 12:42:43

Eric Brotto: On a Linux-based OS, every process is represented by a file, named for the process's PID, on the /proc file system. On Mac OS X, there is no /proc file system (not built in, anyway—I think there's a third-party one available).

Peter Hosey 2010-08-24 13:54:29

So I found out how to implement getrusage using help from here and here. The unfortunate thing is that this manages to get information only about the current process. What I need is CPU time from all the processes running and this from their PID.

Bummer :(

Eric Brotto 2010-08-24 12:47:51

Are you actually interested in the CPU usage of every process separately, or do you only care about CPU usage of the whole system overall?

Peter Hosey 2010-08-24 13:55:00

@Peter I'm interested in the former: "the CPU usage of every process separately" as seen when you call top from command line.

Eric Brotto 2010-08-24 14:27:35

ansaurus

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Using getrusage

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