David W. Fenton / 05.1.22 / 07:37 PM wrote:
Mac users are probably confused about virtual memory because of the way it was bolted onto Mac OS as an extension that often conflicted with applications.
You're now living in a completely different world, one where the apps don't know anything about managing system memory at all. They only know about their own memory requirements.
Keep in mind that under OS X you don't have to set the amount of memory to be allocated to an application (as was the case with Mac OS). This is a direct indication of the fact that memory management is now wholly owned by the operating system itself.
I don't think you understood me. You seems to think I was talking about Classic Mac OSes, while you are clearly based on NT Kernel. Did you know OSX blocks swapfile allocation in 67.1MB each for first two, then size multiplies after, i.e., the 3rd is about 135MB, and the 4th is about 268MB, and so on.? It's not like NT Kernel does at all. And, as I said before, there are some apps that calls vm at launch, and the vm size never changes after that regardless of the presence of available physical memory and the size of the project file.
And to your other post, as far as I know, OSX did not take vm architecture from BSD kernel, which was the base design of Darwin Kernel.
right.....VM didn't come from the BSD kernel....it comes from Mach VM but has been enhanced. But OS X VM does still support Universal Page lists. Apple's Darwin kernel is based on FreeBSD
Oh, and when OSX runs out of physical memory and vm space, it will warn you that you need to exit open applications to free up the memory space, but it will continue to run with, as you said, slow performance if one ignores the warning :-)
--
- Hiro
Hiroaki Honshuku, A-NO-NE Music, Boston, MA <http://a-no-ne.com> <http://anonemusic.com>
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