Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!gorodish!guy
From: guy@gorodish.Sun.COM (Guy Harris)
Newsgroups: comp.unix.wizards
Subject: Re: Virtual Memory Filesystem (?)
Message-ID: <52309@sun.uucp>
Date: 6 May 88 18:54:31 GMT
References: <3711@lynx.UUCP> <4321@vdsvax.steinmetz.ge.com>
Sender: news@sun.uucp
Distribution: na
Lines: 17

> Another 'feature' is that commands like
> 	cp humongeous-file /dev/null
> will take 0 seconds.

Almost:

	Script started on Fri May  6 11:49:27 1988
	gorodish$ cat /etc/motd
	SunOS Release 4.0 (GORODISH) #267: Thu May 5 14:49:36 PDT 1988
	gorodish$ time cp /vmunix /dev/null

	real	0m0.13s
	user	0m0.03s
	sys	0m0.08s

You *do* have to spend some time starting up the program, opening the file,
"mmap"ping the pages, etc..