Date: Fri, 2 May 1997 16:50:09 -0400 (EDT) From: Chuck Robey <chuckr@mat.net> To: mika ruohotie <bsdhack@shadows.aeon.net> Cc: hackers@FreeBSD.ORG Subject: Re: make flags Message-ID: <Pine.BSF.3.91.970502164758.2470W-100000@Journey2.mat.net> In-Reply-To: <199705021852.VAA03005@shadows.aeon.net>
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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! ----------------------------+-----------------------------------------------
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