From owner-freebsd-questions@FreeBSD.ORG Thu Sep 21 15:56:03 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4D76F16A494 for ; Thu, 21 Sep 2006 15:56:03 +0000 (UTC) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (gizmo.acns.msu.edu [35.8.1.43]) by mx1.FreeBSD.org (Postfix) with ESMTP id EC45D43D5A for ; Thu, 21 Sep 2006 15:55:59 +0000 (GMT) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (localhost [127.0.0.1]) by gizmo.acns.msu.edu (8.13.6/8.13.6) with ESMTP id k8LFss7w032563; Thu, 21 Sep 2006 11:54:54 -0400 (EDT) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: (from jerrymc@localhost) by gizmo.acns.msu.edu (8.13.6/8.13.6/Submit) id k8LFsrc2032562; Thu, 21 Sep 2006 11:54:53 -0400 (EDT) (envelope-from jerrymc) Date: Thu, 21 Sep 2006 11:54:53 -0400 From: Jerry McAllister To: backyard Message-ID: <20060921155453.GA32545@gizmo.acns.msu.edu> References: <200609211511.10829.list-freebsd-2004@morbius.sent.com> <20060921152110.31431.qmail@web83109.mail.mud.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060921152110.31431.qmail@web83109.mail.mud.yahoo.com> User-Agent: Mutt/1.4.2.2i Cc: freebsd-questions@freebsd.org, RW Subject: Re: How "real time" is FreeBSD? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Sep 2006 15:56:03 -0000 On Thu, Sep 21, 2006 at 08:21:10AM -0700, backyard wrote: > --- RW wrote: > > > On Thursday 21 September 2006 06:12, Walt Pawley > > wrote: > > > At 11:47 PM -0500 9/20/06, W. D. wrote: > > > >Just reading this about Linux on ZDNet and was > > wondering: > > > > > > > >nn> > > > > > > Cybernetic floobydust, IMHO. > > > > If you read what the banker says: " for each > > thousandth of a second that its > > trading software can act faster than competitors' > > software, the company would > > see $100 million a year in new revenue." > > and for every extra trade they do they change the > stock price faster and faster making them more money. > They're creating the money by manipulating the market > faster; the market doesn't create itself... How can > they even quantify this so called loss when their > trading is constantly changing the state of the > market. Yes, Mr Heisenberg... > > It seems to me that they are really misunderstanding > > the problem. What they > > need is a system that's fast most of the time, > > rather than one that meets an > > arbitary deadline all the time. In other words they > > need a fast system, not a > > realtime system. > > > > I would imagine an extra 100 million would buy quite a > dusy of a system at that... processing data at a rate > of 1000 Hz doesn't seem to suggest a real-time system > is required when the average clock is 1 million times > faster then that. its not like they're doing FFT's on > a Radar signal, to determine if its a bogey and arming > the appropriate countermeasures so they can be > deployed the second the blip appears on the operators > screen. They have all kinds of calculus and successive approximations in their models. The more CPU they have, the more they add to the design. ////jerry > > -brian > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"