From: utzoo!decvax!duke!unc!mcnc!trt
Newsgroups: net.unix-wizards
Title: Re: Availability of C and/or UNIX for IBM 4341?
Article-I.D.: mcnc.1416
Posted: Mon Dec 13 10:47:42 1982
Received: Tue Dec 14 02:40:59 1982
References: sri-unix.4822

Amdahl's UTS is UNIX-on-VM.  It is expensive.
Does anyone on Usenet currently use it?

TUCC (Triangle Universities Computation Center) tried it
two years ago, but cancelled the project in favor of a huge MVS/TSO system.
The project head was Steve Bellovin (unc!smb still works),
with Dennis Rockwell (mcnc!dennis) and myself (duke!trt) part time.
The following info is about 2 years old, but I bet it is still valid.

UTS is half-duplex, its biggest problem.
Its other big problem is that it runs under VM
which is a 20% cpu slowdown unless you have less than 2 Mbytes of primary
in which case it is a 60% IO slowdown (1 or 2 users!).
A 4341 group 2 with 4+ Mbytes supports about 2/3 as many people
as the same machine running CMS/VM.
These are mostly guesses, for more info contact unc!smb.
	Tom Truscott