Date: Tue, 22 Jan 2002 14:12:38 -0600 From: Stephen Montgomery-Smith <stephen@math.missouri.edu> To: mikea <mikea@mikea.ath.cx> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Error in make buildworld Message-ID: <3C4DC7B6.B6C55696@math.missouri.edu> References: <3C4D86A0.1BDE2840@math.missouri.edu> <20020122094857.A5407@mikea.ath.cx>
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mikea wrote: > > On Tue, Jan 22, 2002 at 09:34:56AM -0600, Stephen Montgomery-Smith wrote: > > I have recent sources (the most recent CTM delta). I do make -j4 > > buildworld > > on three different computers. It works on two of them, but on one of > > them (the fastest), I get: > > > > ===> usr.sbin/i4b/ispppcontrol > > rm -f .depend > > mkdep -f .depend -a -I/usr/obj/usr/src/i386/usr/include > > /usr/src/usr.sbin/i4b/ispppcontrol/ispppcontrol.c > > cd /usr/src/usr.sbin/i4b/ispppcontrol; make _EXTRADEPEND > > echo ispppcontrol: /usr/obj/usr/src/i386/usr/lib/libc.a >> .depend > > ===> usr.sbin/i4b/man > > ===> usr.sbin/boot0cfg > > rm -f .depend > > mkdep -f .depend -a -I/usr/obj/usr/src/i386/usr/include > > /usr/src/usr.sbin/boot0cfg/boot0cfg.c > > cd /usr/src/usr.sbin/boot0cfg; make _EXTRADEPEND > > echo boot0cfg: /usr/obj/usr/src/i386/usr/lib/libc.a >> .depend > > 1 error > > *** Error code 2 > > 1 error > > *** Error code 2 > > 1 error > > > > I didn't get this problem when I removed the -j4. This computer had a > > hard drive failure a few months ago, and the replacement drive is > > exceedingly fast. So maybe this computer is "too fast" for -j4 to > > work. As computers get faster and faster, maybe more and more people > > will have this problem. > > This is a known difficulty with multiple make threads. Note that > I do _NOT_ call it a problem. It is caused by a thread that > needs <foo> getting to the part that expects <foo> to have been > built before the thread that actually builds <foo> gets to the > build-foo code. I have found that I frequently can reissue the > same command and <foo> will get built before it is required by > something in another thread, and the make will run to completion > the second time. > But shouldn't the make wait until the first thread finishes before starting the dependent thread? (But I guess if the computer is really fast, it doesn't matter if you don't have -j4. make buildworld takes 45 minutes on the "fast" machine.) -- Stephen Montgomery-Smith stephen@math.missouri.edu http://www.math.missouri.edu/~stephen To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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