From owner-freebsd-hackers Fri May 2 13:51:38 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id NAA22382 for hackers-outgoing; Fri, 2 May 1997 13:51:38 -0700 (PDT) Received: from cais.cais.com (root@cais.com [199.0.216.4]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id NAA22369 for ; Fri, 2 May 1997 13:51:35 -0700 (PDT) Received: from earth.mat.net (root@earth.mat.net [205.252.122.1]) by cais.cais.com (8.8.5/8.7.3) with SMTP id QAA20900; Fri, 2 May 1997 16:51:21 -0400 (EDT) Received: from Journey2.mat.net (journey2.mat.net [205.252.122.116]) by earth.mat.net (8.6.12/8.6.12) with SMTP id QAA05058; Fri, 2 May 1997 16:51:14 -0400 Date: Fri, 2 May 1997 16:50:09 -0400 (EDT) From: Chuck Robey To: mika ruohotie cc: hackers@FreeBSD.ORG Subject: Re: make flags In-Reply-To: <199705021852.VAA03005@shadows.aeon.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Fri, 2 May 1997, mika ruohotie wrote: > something that made me wonder... > > earlier today i read about 'make -j' stuff from the smp list, and i > got the impression that for single cpu something like '-j 4' would > give some performance boost. > > but, i experimented with it myself earlier today and it didnt boost > anything... the fastest compiling i got without any 'j's, i tested > '-j 2' and '-j 4' > > uh, am i missing something? it's only pentium pro spesific? (i have pentium) > > my other kernel flags are '-O2 -pipe' When I tested on my smp box back in January-February, I had an smp kernel, but without activating smp, I was able to get a 30 percent gain by going to -j 8. When I actiavted smp, I was able to get an additional 30 percent gain on top of that. I won't be reporting any updated specs until after May 19 (finals). ----------------------------+----------------------------------------------- Chuck Robey | Interests include any kind of voice or data chuckr@eng.umd.edu | communications topic, C programming, and Unix. 9120 Edmonston Ct #302 | Greenbelt, MD 20770 | I run Journey2 and picnic, both FreeBSD (301) 220-2114 | version 3.0 current -- and great FUN! ----------------------------+-----------------------------------------------