Date: Thu, 5 Feb 2015 16:48:34 -0600 (CST) From: "Valeri Galtsev" <galtsev@kicp.uchicago.edu> To: "Bob Willcox" <bob@immure.com> Cc: freebsd-questions@freebsd.org Subject: Re: buildworld in 45 min! Message-ID: <26731.128.135.70.2.1423176514.squirrel@cosmo.uchicago.edu> In-Reply-To: <20150205223942.GF90738@rancor.immure.com> References: <201501081101.t08B1V2a010623@mech-as221.men.bris.ac.uk> <20150205215106.GE90738@rancor.immure.com> <63016.128.135.70.2.1423175559.squirrel@cosmo.uchicago.edu> <20150205223942.GF90738@rancor.immure.com>
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On Thu, February 5, 2015 4:39 pm, Bob Willcox wrote: > On Thu, Feb 05, 2015 at 04:32:39PM -0600, Valeri Galtsev wrote: >> >> On Thu, February 5, 2015 3:51 pm, Bob Willcox wrote: >> > On Thu, Jan 08, 2015 at 03:01:41AM -0800, Anton Shterenlikht wrote: >> >> I got a Sun Fire X4100 for 60 pounds off ebay: >> >> >> >> FreeBSD 10.1-RELEASE #0 r274401: Tue Nov 11 21:02:49 UTC 2014 >> >> CPU: Dual-Core AMD Opteron(tm) Processor 2220 (2792.64-MHz K8-class >> CPU) >> >> real memory = 17179869184 (16384 MB) >> >> avail memory = 16595623936 (15826 MB) >> >> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs >> >> FreeBSD/SMP: 2 package(s) x 2 core(s) >> >> >> >> It does buildworld -j8 in under 45 min. >> >> That's really fast! >> >> I'm used to 4 hour ia64 builds. >> >> Time to move on perhaps... >> >> >> >> Anton >> > >> > Not trying to show anyone up (really), but you can just imagine how >> > shocked I >> > was when I first ran a buildworld on my current workstation system in >> 11 >> > minutes! >> > >> > FreeBSD 10.1-STABLE #3 r277033: Sun Jan 11 17:07:24 CST 2015 >> > CPU: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz (3300.07-MHz K8-class >> CPU) >> > real memory = 34359738368 (32768 MB) >> > avail memory = 33184337920 (31647 MB) >> > FreeBSD/SMP: Multiprocessor System Detected: 12 CPUs >> > FreeBSD/SMP: 1 package(s) x 6 core(s) x 2 SMT threads >> > >> > The latest run was 11:43 (looks like I'm losing a little ground). This >> is >> > with -j12. >> >> I couple of times had notices incomplete build with -j16 (or whatever >> those boxes allowed), ever since run buildworld as a single thread... >> Maybe just me ;-) >> >> Valeri > > Hmm, I have had quite some success with parallel builds myself. However, I > never bother to go beyond the number of logical CPUs in the system. So do I. "16" was a figure of speech. I usually would use number of CPUs less by 2 than number of physical CPUs on the box (leaving a couple of CPUs for the rest that runs on the box). Otherwise you loose on process switching overhead between processes sharing the same CPU. Not only 0 gain in speed, but loss on process switching overhead. As far as incomplete builds are concerned, I indeed have seen them occasionally, so, lazy person's solution was: single thread build ever since ;-) Again, probably just me. And probably at particular point in time with particular compiler... Valeri > When I > did > try that in the past it didn't seem to really speed things up all that > much > (if any). > > Bob > >> >> > >> > I can remember building 386bsd back in the early '90s on a 386 system >> and >> > it taking >> > just under 24 hours! :) >> > >> >> >> ++++++++++++++++++++++++++++++++++++++++ >> Valeri Galtsev >> Sr System Administrator >> Department of Astronomy and Astrophysics >> Kavli Institute for Cosmological Physics >> University of Chicago >> Phone: 773-702-4247 >> ++++++++++++++++++++++++++++++++++++++++ > > -- > Bob Willcox | You climb to reach the summit, but once > bob@immure.com | there, discover that all roads lead down. > Austin, TX | -- Stanislaw Lem, "The Cyberiad" > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" > ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
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