Date: Tue, 19 Dec 2000 09:38:58 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: Alessandro de Manzano <demanzano@iol.it> Cc: stable@freebsd.org Subject: Re: make -j Message-ID: <20001219093858.N19572@fw.wintelcom.net> In-Reply-To: <20001219122433.A1961@libero.sunshine.ale>; from demanzano@iol.it on Tue, Dec 19, 2000 at 12:24:34PM %2B0100 References: <Pine.LNX.4.10.10012181816270.29890-100000@inet.ssc.nsu.ru> <20001218101613.Y19572@fw.wintelcom.net> <20001219122433.A1961@libero.sunshine.ale>
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* Alessandro de Manzano <demanzano@iol.it> [001219 03:25] wrote: > > The rule with -j is that it _should_ work, if it doesn't then try > > without -j and let us know. > > I did a buildworld/buildkernel last week with "-j 8" on my dual celeron system and all, apparently, went fine. > It saved about 30-40% of time. Version 4.2-stable. > > Could someone, please, explain to me why the "-j" stuff could be dangerous ? > It's not much clear to me why doing more then one "cc" (example) at time could break the final object code. > (no flame, it's a very honest question! :-) ) It's possible for incorrectly set up dependancies to cause files to be compiled incorrectly. It's also possible that incorrectly set up dependancies can cause the build to fail. > > 4-8 is good for a single processor with enough ram (gcc is large), > > 4-24 is ok for a SMP box. > > I did with 8 and now trying with 10 (I've only 96Mb RAM) That may be a bit much, if you start swapping because of it that's one way to know you're using too high of a -j. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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