From owner-freebsd-smp Thu May 1 14:47:03 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id OAA19289 for smp-outgoing; Thu, 1 May 1997 14:47:03 -0700 (PDT) Received: from Ilsa.StevesCafe.com (Ilsa.StevesCafe.com [205.168.119.129]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id OAA19284 for ; Thu, 1 May 1997 14:46:56 -0700 (PDT) Received: from Ilsa.StevesCafe.com (localhost [127.0.0.1]) by Ilsa.StevesCafe.com (8.8.5/8.8.5) with ESMTP id PAA08539; Thu, 1 May 1997 15:45:42 -0600 (MDT) Message-Id: <199705012145.PAA08539@Ilsa.StevesCafe.com> X-Mailer: exmh version 2.0gamma 1/27/96 From: Steve Passe To: Chuck Robey cc: Andreas Klemm , Walter Haslbeck , smp@FreeBSD.ORG, everybodyunix@wup.de, jk@ct.heise.de Subject: Re: Dual PPro Mainboard f. SCO SMP In-reply-to: Your message of "Thu, 01 May 1997 17:11:25 EDT." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 01 May 1997 15:45:42 -0600 Sender: owner-smp@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Hi, >Andreas, I think you really ought to double check this. When I did my >own checks on my SMP setup, I found that just running make -j 8 (without >going smp) gave a serious speedup. There WAS additional speedup when I >turned on smp, but it's NOT 2 for 1. To do the benchmark correctly, you >have to run the same program in both places, and turning on the -j 8 >feature for smp only is fooling you. being a bi-noid I always have trouble with statistical type math, but I would set the difference shown by these figures as 1.79 using "-j4" for UP and "-j8" for SMP is fair, as these produce the best results for each case. the time for UP at -j4: 213.17 the time for SMP at -j8: 119.08 213.17 / 119.08 == 1.789696 not quite 2-1, but not shabby. Chuck, you might want to re-try your test compiles, we have gained some speed with recent changes. -- Steve Passe | powered by smp@csn.net | Symmetric MultiProcessor FreeBSD