Date: Sun, 07 Jul 2013 11:50:29 +0300 From: Daniel Braniss <danny@cs.huji.ac.il> To: Jeremy Chadwick <jdc@koitsu.org> Cc: "freebsd-stable@freebsd.org Stable" <freebsd-stable@freebsd.org>, Dimitry Andric <dim@FreeBSD.org> Subject: Re: make buildworld is now 50% slower Message-ID: <E1Uvkft-0007jb-O6@kabab.cs.huji.ac.il> In-Reply-To: <20130705145839.GB5449@icarus.home.lan> References: <E1Uv1lv-0000wY-9K@kabab.cs.huji.ac.il> <CE93BC6C-31DE-4549-B257-004D3DFE4294@FreeBSD.org> <20130705145839.GB5449@icarus.home.lan>
next in thread | previous in thread | raw e-mail | index | archive | help
> 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 > It's been a long time since I saw such numbers, maybe it's time to see where time is being spent, I will run it without clang to compare with your numbers. > 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. > from what you are saying, I guess clang is not responsible. looking for my Sherlock Holmes hat. thanks, danny > -- > | Jeremy Chadwick jdc@koitsu.org | > | UNIX Systems Administrator http://jdc.koitsu.org/ | > | Making life hard for others since 1977. PGP 4BD6C0CB | >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?E1Uvkft-0007jb-O6>