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- Path: comma.rhein.de!serpens!not-for-mail
- From: mlelstv@serpens.rhein.de (Michael van Elst)
- Newsgroups: comp.sys.amiga.datacomm,comp.sys.amiga.advocacy,comp.sys.amiga.misc,comp.sys.amiga.networking
- Subject: Re: New Press Release!
- Date: 24 Mar 1996 11:23:42 +0100
- Organization: dis-
- Message-ID: <4j37re$k6q@serpens.rhein.de>
- References: <4iofm6$e4j@serpens.rhein.de> <DoLC38.2G4@info.uucp> <4ir19b$mml@serpens.rhein.de> <oj6wx4dne22.fsf@hpsrk.fc.hp.com> <4ivdqe$62a@serpens.rhein.de> <19960323.75240E0.D624@contessa.phone.net>
- NNTP-Posting-Host: serpens.rhein.de
-
- mwm@contessa.phone.net (Mike Meyer) writes:
-
- >> Err, yes. If you use more RAM than you have you start thrashing.
-
- >Err, no. Using more RAM than you have is a necessary but precondition
- >for thrashing, but it's not sufficient.
-
- [...]
-
- >thrashing. This is an extreme example of a property called "locality
- >of reference",
-
- [...]
-
- With "use memory" I was refering to "accessing memory". And this means
- the working set of the process. As soon as your working set exceeds
- real memory (or the sum of all working sets) you start thrashing.
-
- And seeing that people want to use VM _in a paint program to load
- pictures larger than real memory_ I am pretty sure that the whole
- picture is part of the working set.
-
- For batch processing programs thrashing might be tolerable (that's
- why I said that AdPro or Lightwave can utilize VM). But then you
- don't expect someone to buy an EC030 machine to run AdPro or
- Lightwave, no ?
-
- >In general, it's considered a win. Systems designed to handle
- >processes that can't afford the performance degradation due to demand
- >paging usually have hooks to lock those processes in memory.
-
- You have to look at how a machine is used. AmigaOS is not UNIX and
- very few people use it to run a plethora of low priority background
- daemons (that don't care about being swapped out) or as a multi-user
- machine (where VM more or less guarantees that no user monopolizes
- the memory resources).
-
- I agree that VM is better than nothing but IMHO it doesn't justify
- extra cost for everyone.
-
- Regards,
- --
- Michael van Elst
-
- Internet: mlelstv@serpens.rhein.de
- "A potential Snark may lurk in every tree."
-