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- Newsgroups: comp.sys.acorn
- Path: sparky!uunet!ftpbox!mothost!merlin.dev.cdx.mot.com!merlin.dev.cdx.mot.com!lezz
- From: lezz@merlin.dev.cdx.mot.com (Lezz Giles)
- Subject: Re: OS differences and improvements (Was Re: new PC's, what's happening acorn?)
- Message-ID: <1992Aug25.134924.9601@merlin.dev.cdx.mot.com>
- Sender: news@merlin.dev.cdx.mot.com (USENET News System)
- Nntp-Posting-Host: monarch.dev.cdx.mot.com
- Reply-To: lezz@merlin.dev.cdx.mot.com (Lezz Giles)
- Organization: Motorola Codex, Canton, MA
- References: <9208250652.AA04072@ucbvax.Berkeley.EDU>
- Date: Tue, 25 Aug 1992 13:49:24 GMT
- Lines: 20
-
- (lots of garbage on why VM is terrible deleted (as it should be :-)
-
- Anybody who thinks that VM doesn't and cannot work should (a) try using
- a decent computer, and (b) take a decent computer science course. For
- many years I worked on an Amdahl mainframe supporting around 200 users
- running a SVR2-1/2 (i.e. halfway between release 2 and release 3) Unix.
- It worked extremely well - you could easily live with the illusion that
- you were the only user on the system. Basically, the underlying operations
- required by a VM are so fast and implemented at such a low level in hardware
- that the overhead is tiny and totally unnoticed. "Ah but" I hear you cry,
- "That's fine for mainframes, but what about smaller systems!". I'm currently
- on a DECstation - a single user workstation with X windows. I don't
- notice the VM at all. I've also seen HP, Sun, etc. etc workstations with
- VM and with the same illusion of no VM.
-
- Virtual memory is a fact of life, and virtual memory works extremely well.
- Before anybody flames me back, make sure that you have satisfied both
- conditions (a) and (b) above.
-
- lezz "what, me elitist?" Giles
-