From owner-freebsd-hardware@FreeBSD.ORG Fri Mar 12 02:39:14 2004 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A8CEE16A4CE for ; Fri, 12 Mar 2004 02:39:14 -0800 (PST) Received: from gunfright.epcdirect.co.uk (gunfright.epcdirect.co.uk [195.10.242.32]) by mx1.FreeBSD.org (Postfix) with ESMTP id A5DC743D41 for ; Fri, 12 Mar 2004 02:39:13 -0800 (PST) (envelope-from freebsd-hw@epcdirect.co.uk) Received: from localhost (localhost [127.0.0.1]) by gunfright.epcdirect.co.uk (Postfix) with ESMTP id 8EA6415507; Fri, 12 Mar 2004 10:39:11 +0000 (GMT) Received: from gunfright.epcdirect.co.uk ([127.0.0.1])port 10024) with ESMTP id 89511-10; Fri, 12 Mar 2004 10:39:09 +0000 (GMT) Received: from lfarr (host213-122-199-248.in-addr.btopenworld.com [213.122.199.248]) by gunfright.epcdirect.co.uk (Postfix) with ESMTP id 1060D1551B; Fri, 12 Mar 2004 10:39:09 +0000 (GMT) From: "Lawrence Farr" To: "'Artem Koutchine'" , Date: Fri, 12 Mar 2004 10:39:17 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.5510 In-Reply-To: <002f01c4081c$bd720810$0c00a8c0@artem> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Thread-Index: AcQIHWOFbSi0oqFpSHijJjhQlXSiowAAJMMQ Message-Id: <20040312103909.1060D1551B@gunfright.epcdirect.co.uk> X-Virus-Scanned: by GunFright.EPCDirect.co.uk Subject: RE: Multiprocessor system VS one processor system X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Mar 2004 10:39:14 -0000 I think you need to take into account everything else that changed as well, memory speed, disk controllers etc. Lawrence Farr EPC Direct Limited > -----Original Message----- > From: owner-freebsd-hardware@freebsd.org > [mailto:owner-freebsd-hardware@freebsd.org] On Behalf Of > Artem Koutchine > Sent: 12 March 2004 10:28 > To: freebsd-hardware@freebsd.org > Subject: Multiprocessor system VS one processor system > > Hi! > > I need to understand something very clear. > > As I understand FreeBSD (as of 4.9) runs one process > per one CPU. This means, that if i have dual systems > with 500Mhz CPUs one process can never run faster > than on a single 500Mhz CPU. However, if i substitute > those two CPUs with one 1000Mhz, that one process will run > twice as fast than on dual 500Mhz, however, to box will > become a bit less responsive, because in a dual box > when one CPU is loaded, another one may have some > spare time to respond. However, in case of very loaded > box both CPUs a extremely loaded and the box will > be as responsive as single 1000Mhz CPU box 100% loaded. > So, according to what i just said there is not real reason to > setup a dual CPU box under FREEBSD unless you want to > have 5000Mhz box, but there is no CPU with such speed, so > you put two 2500Mhz CPU in it and if you are running a lot > of processes with short run periods you will get overal > perfomance somewhere near 5000Mhz. However, when i > subsituted two 500Mhz CPUs with 1500Mhz one (even with > less 2nd level cache) on a heavy loaded web server i notice > that sites started to load faster. So, it seems as > one 3X Mhz CPU is faster that two X MHz CPUs, at least > for web server with sql base and many perl scripts. > > So, there are two questions: > 1) Am I right or am wrong? > 2) Does FreeBSD 5.X run one process only on one CPU > or it can run on thread of a process on one CPU and another > thread on another CPU? > > Regards, > Artem > _______________________________________________ > freebsd-hardware@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hardware > To unsubscribe, send any mail to > "freebsd-hardware-unsubscribe@freebsd.org" >