Date: Mon, 8 Jul 2013 17:16:18 -0700 From: Garrett Cooper <yaneurabeya@gmail.com> To: Devin Teske <dteske@freebsd.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Alfred Perlstein <alfred@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r253002 - head Message-ID: <93211009-266E-4491-B706-67847A055832@gmail.com> In-Reply-To: <13CA24D6AB415D428143D44749F57D7201FB7609@ltcfiswmsgmb21> References: <201307072039.r67KdCdR028908@svn.freebsd.org> <9D4C7540-A3B0-45E5-8219-6A455D41DF70@gmail.com> <51D9DA55.2090808@freebsd.org> <13CA24D6AB415D428143D44749F57D7201FB7609@ltcfiswmsgmb21>
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On Jul 8, 2013, at 5:12 PM, Teske, Devin wrote: > 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? >> >> Numbers higher seem to result in worse performance as reported by some members of my team. >> > > We've run as high as -j48 ... number of logical cpu's "times-two" (it was on 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. +1 as well, which is part of the reason why I questioned the performance recommendation, but that's beside the point. Thanks!
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