Date: Fri, 5 Jul 2013 07:58:39 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: Dimitry Andric <dim@FreeBSD.org> Cc: "freebsd-stable@freebsd.org Stable" <freebsd-stable@freebsd.org> Subject: Re: make buildworld is now 50% slower Message-ID: <20130705145839.GB5449@icarus.home.lan> In-Reply-To: <CE93BC6C-31DE-4549-B257-004D3DFE4294@FreeBSD.org> References: <E1Uv1lv-0000wY-9K@kabab.cs.huji.ac.il> <CE93BC6C-31DE-4549-B257-004D3DFE4294@FreeBSD.org>
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On Fri, Jul 05, 2013 at 02:39:00PM +0200, Dimitry Andric wrote: > [redirecting to the correct mailing list, freebsd-stable@ ...] > > On Jul 5, 2013, at 10:53, Daniel Braniss <danny@cs.huji.ac.il> wrote: > > after today's update of 9.1-STABLE I noticed that make build[world|kernel] are > > taking conciderable more time, is it because the upgrade of clang? > > and if so, is the code produced any better? > > > > before: > > buildwordl: 26m4.52s real 2h28m32.12s user 36m6.27s sys > > buildkernel: 7m29.42s real 23m22.22s user 4m26.26s sys > > > > today: > > buildwordl: 34m29.80s real 2h38m9.37s user 37m7.61s sys > > buildkernel: 15m31.52s real 22m59.40s user 4m33.06s sys > > Ehm, your user and sys times are not that much different at all, they > add up to about 5% slower for buildworld, and 1% faster for build kernel. > Are you sure nothing else is running on that machine, eating up CPU time > while you are building? :) > > But yes, clang 3.3 is of course somewhat larger than 3.2. You might > especially notice that, if you are using gcc, which is very slow at > compiling C++. > > In any case, if you do not care about clang, just set WITHOUT_CLANG= in > your /etc/src.conf, and you can shave off some build time. I just built world/kernel (stable/9 r252769) 5 hours ago. Results: time make -j4 buildworld = roughly 21 minutes on my hardware time make -j4 buildkernel = roughly 8 minutes on my hardware These numbers are about the norm for me, meaning I do not see a substantial increase in build times. Key point: I do not use/build/grok clang, i.e. WITHOUT_CLANG=true is in my src.conf. But I am aware of the big clang change in r252723. If hardware details are wanted, ask, but I don't think it's relevant to what the root cause is. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Making life hard for others since 1977. PGP 4BD6C0CB |
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