Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site cvaxa.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!qantel!lll-crg!gymble!umcp-cs!seismo!mcvax!ukc!warwick!cvaxa!aarons From: aarons@cvaxa.UUCP (Aaron Sloman) Newsgroups: net.arch,net.ai Subject: M68020 and SUN3 Message-ID: <171@cvaxa.UUCP> Date: Fri, 29-Nov-85 18:27:57 EST Article-I.D.: cvaxa.171 Posted: Fri Nov 29 18:27:57 1985 Date-Received: Mon, 2-Dec-85 03:24:39 EST Organization: Univ of Sussex, Cognitive Studies, UK Lines: 36 Xref: watmath net.arch:2205 net.ai:3125 Xpath: warwick ubu >From: Shih-Lien Lu >Subject: Re: M68020 and SUN3 >Newsgroups: net.arch,net.ai >In-Reply-To: <166@cvaxa.UUCP> >Organization: UCLA Computer Science Dept. > >In your posting to the net.arch news group you stated that a relative >speed up of 3 to 5 is achieved with SUN3 over SUN2 in the area of running >PROLOG. Do you have information in other areas? (e.g. floating point >bound computation, memory bound application ... etc.) > ..... Sorry - SUN lent us the machine (without manuals) for only 3 days to try porting POPLOG, and whet our appetite... Lack of manuals and minor discrepancies with SUN-2 held up work. So we did not have time for a full range of tests. We did try to simulate using the machine (SUN-3 with 4 Mbytes memory and 71 Mbyte disk) as a multi-user machine (which we are hoping to use eventually for teaching purposes) and found evidence that with up to 7 users at least, performance degraded reasonably well, real time for 7 processes varying between 3 and 7 times one process (depending whether disk access was holding things up). We are very impressed so far, and would like to own some! Aaron Ps Contrary to some views on net.arch we would not consider a machine without virtual memory facilities, because most of our programs are sufficiently large that start-up time would be intolerable. It made a huge difference when the virtual memory Unix system started working on our 8 MByte GEC-63 machine. -- Aaron Sloman, U of Sussex, Cognitive Studies, Brighton, BN1 9QN, England uucp:...mcvax!ukc!cvaxa!aarons arpa/janet: aarons%svga@uk.ac.ucl.cs OR aarons%svga@ucl-cs