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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!kithrup!hoptoad!decwrl!mips!munnari.oz.au!bruce.cs.monash.edu.au!monu6!yoyo.cc.monash.edu.au!parry
- From: parry@yoyo.cc.monash.edu.au (Tom J Parry)
- Subject: Re: Above 16MB. Possible FAQ. Summary needed.
- Message-ID: <1992Aug19.123804.15920@monu6.cc.monash.edu.au>
- Originator: parry@yoyo.cc.monash.edu.au
- Sender: news@monu6.cc.monash.edu.au (Usenet system)
- Organization: Monash University, Melb., Australia.
- References: <1992Aug18.171339.16425@njitgw.njit.edu>
- Date: Wed, 19 Aug 1992 12:38:04 GMT
- Lines: 44
-
- David Charlap (dic5340@hertz.njit.edu) wrote:
- >
- > Since ISA boards are physically incapable of using DMA to transfer
- > data above the 16MB line, OS/2 has to copy data first. In other
- > words, if you close the window and OS/2 has to write something to the
- > disk, and that something is located in high memory (above 16MB), then
- > the system has to move the data "south" of the 16MB line before
- > writing it. This may require other data to be moved "north" or
- > swapped to disk.
- >
- > At least, it's a good theory. It might also simply be a bug.
-
- If that IS the case, any suggestions on what to do with the >16MB. I
- presume (if your above analysis is correct) disk caches in that area
- will have the same problem. On the other hand, would OS/2 not recohnise
- this higher memory and prefer the lower stuff to it. These pauses I hget
- occur even ijust after I start OS/2. I would find it difficult to
- believe 16MB has already been consumed by that point.
-
- >
- > >Also, what is the best program around for getting stats on memory usage.
- > >Sort of a MEM for OS/2 or even better, something like MANIFEST (I live &
- > >dream in hope).
- >
- > Not likely. What kind of info do you want? With a virtual memory
- > system, all memory is either free, or can be made free. And you have
- > all the swap space on your disk that can be allocated as well. You'd
- > need many numbers, like:
- >
- > Number of free pages in memory
- > Number of discardable pages in memory
- > Number of pages that can be swapped to disk
- > Amount of free swap space on disk
- > Size of the largest contiguous block of memory
-
- The kind of stats I would probably be after would be physical memory
- stuff. Information such as how mnuch is being used and for what. How
- much of my RAM is free etc. In my opinion these facts govern performance
- more than the amount of swap space availabl;e and demonstrate what OS/2
- is actually doing with RAM (which up to now, seems to be a mystery).
-
- --
- Tom J Parry.
- Your reality is a figment of my imagination.
-