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Re: getrusage only partially working?

Subject: Re: getrusage only partially working?
From: Terry Lambert <email@hidden>
Date: Tue, 11 Dec 2007 18:27:34 -0800
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On Dec 11, 2007, at 7:26 AM, Mike Fischer wrote:

Hi!
For some reason I can't seem to get getrusage(2) to work the way I expect it to under 10.4.11 on a PPC G5 machine (haven't tested on other machines).

I expected the memory related fields to show values other than 0 which more or less correlate with the actual memory usage of the application. But what I am seeing is values of 0 only in each of these fields (ru_maxrss, ru_ixrss, ru_idrss, ru_isrss).

Probably I'm doing something wrong, but what?

Most of the information you are requesting in Mac information, and you are requesting it using a BSD API.

The BSD API idea of the information will not be updated until the process exits (see xnu/bsd/kern/kern_exit.c:proc_exit()).

If you want this information while the process is running, you're going to need link against the whole kernel and use unsupported APIs.

Needless to say, this will end up being rather expensive, which is why we don't export them via BSD in the first place.

-- Terry
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