Re: ANN: VMTester - virtual memory testing utility
Re: ANN: VMTester - virtual memory testing utility
- Subject: Re: ANN: VMTester - virtual memory testing utility
- From: Ben Dougall <email@hidden>
- Date: Tue, 5 Apr 2005 23:08:43 +0100
On Tuesday, April 5, 2005, at 10:44 pm, Cameron Hayne wrote:
But so far, I find that it is proving some of my previous statements
wrong -
those about the "inactive" memory. Of course, it's not entirely my
fault
since I was just repeating what Apple has said in its developer docs
(http://developer.apple.com/documentation/Performance/Conceptual/
ManagingMem
ory/Concepts/AboutMemory.html) and in this relatively recent article on
Activity Monitor: http://docs.info.apple.com/article.html?artnum=107918
When I allocate memory using my VMTester app, I see that it is adding
to the
"inactive" list. I had expected to see it added to the "active" list
instead
i think it's like this:
allocating it just ear marks it -- you don't actually, physically get
the memory when you allocate it. when you make use of it, that's when
things actually happen. so i think if you were to allocate 100mb of
memory not a lot happens, apart from you now have the right to use
100mb of memory. when and if you use, say just 1mb of that 100mb,
that's when things actually happen. that's when real memory (1mb) is
taken over by your app. it allocates on actual access/use -- puts
allocation off to the last possible moment basically i think.
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