Date: Thu, 1 May 1997 17:11:25 -0400 (EDT) From: Chuck Robey <chuckr@mat.net> To: Andreas Klemm <andreas@klemm.gtn.com> Cc: Walter Haslbeck <WH@ODS.de>, smp@FreeBSD.org, everybodyunix@wup.de, jk@ct.heise.de Subject: Re: Dual PPro Mainboard f. SCO SMP Message-ID: <Pine.BSF.3.91.970501170835.2470B-100000@Journey2.mat.net> In-Reply-To: <199705011339.PAA02810@klemm.gtn.com>
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On Thu, 1 May 1997, Andreas Klemm wrote: > [Posted and mailed] > > In article <6VndaKB5SfB@surfer.ods.de>, > WH@ODS.de (Walter Haslbeck) writes: > [snip] > > BTW: Wie siehts eigentlich z.Z. an der FreeUnix Front aus in Sachen SMP? > > Gibts irgendwo im Web Benchmarkergebnisse, die SCO SMP mit Linux/SMP > > bzw. FreeBSD/SMP vergleichen? > > I'm writing this in english, so I can write this also to the > FreeBSD SMP mailinglist. I suppose the people there are interested > in numbers and figures as well ;-) > > I'll put together some nice gif files later, that are suitable to > be put onto a Web Server. > > I made something like an application level benchmark by compiling > my FreeBSD custom kernel with different kernels and job parameters > for make (-j). You can see this kind of tests already in PC magazines > like C't, where they bench the compile time for a Linux kernel. > > For reference: > Tyan Titan Pro ATX, 64 MB RAM, 2 x 200 MHz Pro [some deletions of data] 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. > > 2) Using the SMP kernel with 2 CPU's and make -j 4 and -j 8 is > really fast > > The performance boost you get now with FreeBSD SMP > _for_this_kind_of_application is factor 1.9 !!! > > To sum up: you nearly double the performance of your system !!! > > I think important here is, that every PPro CPU has it's own 2nd > level cache. > > Andreas /// > > -- > powered by > Symmetric MultiProcessor FreeBSD > http://www.freebsd.org/~fsmp/SMP/SMP.html > > ----------------------------+----------------------------------------------- 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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