Date: Tue, 9 Jul 2013 00:12:22 +0000 From: "Teske, Devin" <Devin.Teske@fisglobal.com> To: Alfred Perlstein <alfred@freebsd.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Devin Teske <dteske@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, Garrett Cooper <yaneurabeya@gmail.com> Subject: Re: svn commit: r253002 - head Message-ID: <13CA24D6AB415D428143D44749F57D7201FB7609@ltcfiswmsgmb21> In-Reply-To: <51D9DA55.2090808@freebsd.org> References: <201307072039.r67KdCdR028908@svn.freebsd.org> <9D4C7540-A3B0-45E5-8219-6A455D41DF70@gmail.com> <51D9DA55.2090808@freebsd.org>
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On Jul 7, 2013, at 2:15 PM, Alfred Perlstein wrote: > On 7/7/13 2:01 PM, Garrett Cooper wrote: >> Why the magic number 12? >=20 > Numbers higher seem to result in worse performance as reported by some me= mbers of my team. >=20 We've run as high as -j48 ... number of logical cpu's "times-two" (it was o= n a box with 24 logical CPUs). We did buildworld in under 9 minutes. Beyond the "times-two" rule we saw a = slow-down. NOTE: I might also mention this was on RAID-1 SSD. --=20 Devin >> On Jul 7, 2013, at 1:39 PM, Alfred Perlstein <alfred@FreeBSD.org> wrote: >>=20 >>> Author: alfred >>> Date: Sun Jul 7 20:39:11 2013 >>> New Revision: 253002 >>> URL: http://svnweb.freebsd.org/changeset/base/253002 >>>=20 >>> Log: >>> Document tip on how to build all kernels quickly. >>>=20 >>> Modified: >>> head/Makefile >>>=20 >>> Modified: head/Makefile >>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D >>> --- head/Makefile Sun Jul 7 19:58:14 2013 (r253001) >>> +++ head/Makefile Sun Jul 7 20:39:11 2013 (r253002) >>> @@ -32,6 +32,12 @@ >>> # targets - Print a list of supported TARGET/TARGET_ARCH pa= irs >>> # for world and kernel targets. >>> # toolchains - Build a toolchain for all world and kernel targ= ets. >>> +# >>> +# "quick" way to test all kernel builds: >>> +# _jflag=3D`sysctl -n hw.ncpu` >>> +# _jflag=3D$(($_jflag * 2)) >>> +# [ $_jflag -gt 12 ] && _jflag=3D12 >>> +# make universe -DMAKE_JUST_KERNELS JFLAG=3D${jflag} >>> # >>> # This makefile is simple by design. The FreeBSD make automatically rea= ds >>> # the /usr/share/mk/sys.mk unless the -m argument is specified on the >>> _______________________________________________ >>> svn-src-head@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/svn-src-head >>> To unsubscribe, send any mail to "svn-src-head-unsubscribe@freebsd.org" >=20 _____________ The information contained in this message is proprietary and/or confidentia= l. If you are not the intended recipient, please: (i) delete the message an= d all copies; (ii) do not disclose, distribute or use the message in any ma= nner; and (iii) notify the sender immediately. In addition, please be aware= that any message addressed to our domain is subject to archiving and revie= w by persons other than the intended recipient. Thank you.
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