From owner-freebsd-hackers Fri Oct 31 18:29:54 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id SAA22571 for hackers-outgoing; Fri, 31 Oct 1997 18:29:54 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from sendero-ppp.i-connect.net (sendero-ppp.i-Connect.Net [206.190.143.100]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id SAA22542 for ; Fri, 31 Oct 1997 18:29:45 -0800 (PST) (envelope-from shimon@sendero-ppp.i-connect.net) Received: (qmail 26046 invoked by uid 1000); 1 Nov 1997 02:30:12 -0000 Message-ID: X-Mailer: XFMail 1.2-beta-100797 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit MIME-Version: 1.0 In-Reply-To: <199710312143.QAA25551@dyson.iquest.net> Date: Fri, 31 Oct 1997 18:30:12 -0800 (PST) Organization: Atlas Telecom From: Simon Shapiro To: "John S. Dyson" Subject: Re: Memory VS. Performance under FreeBSD Cc: hackers@FreeBSD.ORG, (Jamil J. Weatherbee) Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Hi "John S. Dyson"; On 31-Oct-97 you wrote: > Jamil J. Weatherbee said: > > > > Does anybody have any statistics on memory vs. performance as you go to > > large memory configurations (>64MB), also what is the biggest RAM > > configuration possible on a FreeBSD machine? > > > > Kind of something like: > > > > > > RAM for x USERS for x MEAN PROCESSES vs x DISK ACCESS > > > Can't answer that specific question. However, there is kind of a design > "idea" that it should work with 3GB of RAM. That would require > significant > kernel tuning, because few of us have any experience with machines that > large. > > We have avoided or fixed terrible algorithms like O(n^2,3,4) stuff. We > still have > stuff that can be improved, but we are making continual progress. Old, old yardsticks for timeshare and RDBMS (very arguable) 64k per char mode user 1MB per X user 1MB per xterm screen 1MB per seat for RDBMS engine 1MB per MIPS There are not necessarily cumulative, but are definitely speculative :-) --- If Microsoft Built Cars: Every time they repainted the lines on the road, you'd have to buy a new car. Sincerely Yours, Simon Shapiro Atlas Telecom Senior Architect 14355 SW Allen Blvd., Suite 130 Beaverton OR 97005 Shimon@i-Connect.Net Voice: 503.799.2313