Date: Sat, 15 Sep 2007 23:38:34 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: josh.carroll@gmail.com Cc: Maxim Khitrov <mkhitrov@gmail.com>, Aryeh Friedman <aryeh.friedman@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Building a new workstation - dual or quad-core CPU for FreeBSD 7? Message-ID: <46EC50DA.6000104@FreeBSD.org> In-Reply-To: <8cb6106e0709151435p72cd328by63895421f3a63ea4@mail.gmail.com> References: <26ddd1750709141351i3646e9bdg8d8b7e93461167f9@mail.gmail.com> <bef9a7920709141441r5c228a8bu1fcf2ea15868c3c@mail.gmail.com> <26ddd1750709151014x2112b022r9bcb999fbf1e7e49@mail.gmail.com> <46EC270A.3020100@FreeBSD.org> <8cb6106e0709151421h7bfdeb6fo7dc671820294e9c7@mail.gmail.com> <46EC4F59.7070104@FreeBSD.org> <8cb6106e0709151435p72cd328by63895421f3a63ea4@mail.gmail.com>
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Josh Carroll wrote: >> Yes, 4BSD is still the default, although you definitely want to use ULE >> for performance reasons (NB: only on 7, dont use ULE on 6). I don't >> know whether the release engineers plan to change that default, but I >> will check. > > Great, thanks for the info. Good to know, I'll be sure to use ULE when > 7.0 is released. :) > >> JFYI, buildworld is a really bad benchmark for testing SMP performance >> in general (on 4 cpus it is not too bad), because the makefiles are not >> written to efficiently parallelize builds on many CPUs, so large parts >> end up running with only a single make job at a time. > > Understood, just a data point. :) Probably a better one: ffmpeg > encoding H.264 content with -threads 8 is nearly 4x as fast as a > single threaded ffmpeg process, so it's scaling well at least for > ffmpeg (linked against pthread). That's good to know. You should be using libthr for threaded performance though :) That benchmark is probably almost all userland though, so performance may not suffer much from libpthread. Kris
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