From owner-freebsd-current Sat Mar 21 14:03:34 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id OAA10205 for freebsd-current-outgoing; Sat, 21 Mar 1998 14:03:34 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from sendero.simon-shapiro.org (sendero-fddi.Simon-Shapiro.ORG [206.190.148.2]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id OAA10145 for ; Sat, 21 Mar 1998 14:03:19 -0800 (PST) (envelope-from shimon@simon-shapiro.org) Received: (qmail 17195 invoked from network); 21 Mar 1998 22:09:00 -0000 Received: from localhost.simon-shapiro.org (HELO sendero-fxp0.simon-shapiro.org) (@127.0.0.1) by localhost.simon-shapiro.org with SMTP; 21 Mar 1998 22:09:00 -0000 Message-ID: X-Mailer: XFMail 1.3-alpha-031798 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Sat, 21 Mar 1998 14:09:00 -0800 (PST) Reply-To: shimon@simon-shapiro.org Organization: The Simon Shapiro Foundation From: Simon Shapiro To: Brian Tao Subject: Re: Worldstone Continued... Cc: current@FreeBSD.ORG, Andrew Reilly Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 21-Mar-98 Brian Tao wrote: > On Thu, 19 Mar 1998, Andrew Reilly wrote: >> >> It would be interesting to see a "speed of light" figure for >> buildworld. I note that there are some people on this list with >> access to machines with seriously big DRAM (.5G?) on their systems. >> I doubt that any one compile operation exercises more than a few >> Meg, with -pipe. > > If you have that much RAM to spare on a system, make a 384MB > memory filesystem, and stick /var/tmp, /usr/obj and /usr/src on it. > Then try a buildworld and see how fast it goes. /usr/obj and /usr/src > should fit in 384MB. My very humble opinion is that we are barking up the wrong tree. Disk I/O is not the limiting factor here. I am looking at disk bandwidth utilization of less than 20%. From idle observation, it appears that parsing Makefiles is 4-5 times the amount of time it takes to actually compile anything. The curious could take the kernel directory and write a simple script to compile it without make at all. Tell us the results. Simon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message