Date: Thu, 12 Apr 2007 21:48:03 +0200 From: "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de> To: Benjamin Lutz <mail@maxlor.com> Cc: Garrett Cooper <youshi10@u.washington.edu>, freebsd-ports@freebsd.org Subject: Re: parallel builds revisited Message-ID: <461E8CF3.3030203@gmx.de> In-Reply-To: <200704122108.01376.mail@maxlor.com> References: <200704100452.40574.mail@maxlor.com> <1176363454.72184.2.camel@pav.hide.vol.cz> <461DF6A3.9030201@u.washington.edu> <200704122108.01376.mail@maxlor.com>
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Benjamin Lutz wrote: > On Thursday 12 April 2007 11:06, Garrett Cooper wrote: >> I dunno how you want to approach this, but gmake does recommend 2 >> jobs be run in parallel for HTT enabled chips, and 3 or 4 jobs for a >> dual core machines. >> -Garrett > > So far the approach is one job per CPU. I'll do some benchmarks lateron > to determine wether it really helps to run more jobs. For the KDE > ports, my gut feeling is that the improvement would be negligible. I'll > have to evaluate non-C++ ports like gnome-*, where the compilation time > per file is shorter. I find the benefit especially big with Gecko based ports like Firefox or Thunderbird. > Of course, to make proper use of distcc, at least #cores + 1 jobs are > required. I'll keep that in mind. The recommendation of the Distcc developers is 2 jobs per core, as long as the machines contain sufficient memory. My personal experience says that it's rarely possible to divide a Makefile into more than 6 threads.
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