the Virtual Memory
the Virtual Memory
- Subject: the Virtual Memory
- From: Graham J Lee <email@hidden>
- Date: Fri, 09 Jun 2006 00:18:49 +0100
Hi,
a while ago I wrote a tool similar to Linux's free for Darwin (basically
at the time because I needed a quick way to log the RAM consumption of a
WebObjects server), but left out reporting on swap because I didn't know
how. Now I'm coming back to fill in reporting on swap, and still don't
know how :-)
Does the value vm_statistics_t->pageouts report the number of pageouts
since boot, or the number of pages which are currently paged out? If
the latter, then I suppose the 'used swap space' is simply that quantity
times the page size. What is the 'total swap space', if such a question
makes sense with this VMM? Is it just the size of all of the in-use
swapfiles? Is there yet any way to determine the files currently being
used for swap? Oh, and is there a modern equivalent for mach_swapon and
/etc/swaptab?
Maybe a better question would be: where is there a general reference to
the VMM used in Darwin, beyond the source code (xnu/osfmk/vm/)? I've
just found the Rashid/Tevanien/et al paper on the mach VMM, which I
"look forward" to ploughing through along with the appropriate chapter
in the OSF documentation. Is there anything Darwin-specific?
Cheers,
Graham.
--
Graham Lee
UNIX Systems Manager,
Oxford Physics Practical Course
http://iamleeg.blogspot.com/
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