Re: 7+ days of dogfood

On Mon, Feb 11, 2013 at 01:17:41PM +0100, Fabian Keil wrote:
> Erich Dollansky <erichsfreebsdlist_at_alogt.com> wrote:
> 
> > On Mon, 11 Feb 2013 11:48:11 +0100
> > Fabian Keil <freebsd-listen_at_fabiankeil.de> wrote:
> 
> > > It's unfortunate that the builworld time roughly trippled since
> > > 2010 but I guess that's progress and a more powerful system
> > > should fix it. I certainly welcome clang in general, though.
> > > 
> > Trippled? Are you sure? I have the feeling it is much worse than this.
> 
> I'm sure it depends on lots of factors and our worlds probably
> don't even match.
> 
> I intend to eventually plot the numbers I've collected over the years
> (mainly to have a baseline for ZFS tuning) but so far I haven't and
> just looked at the first and last ones:
> 
> --------------------------------------------------------------
> >>> Kernel build for ZOEY completed on Mon May 31 17:18:12 CEST 2010
> --------------------------------------------------------------
> 
> real    10m42.935s
> user    8m16.834s
> sys     1m22.951s
> --------------------------------------------------------------
> >>> World build completed on Mon May 31 18:38:59 CEST 2010
> --------------------------------------------------------------
> 
> real    71m16.524s
> user    51m55.771s
> sys     12m24.944s
> 
> # FreeBSD r500.local 10.0-CURRENT FreeBSD 10.0-CURRENT #543 r+b74c91e: Sun Feb  3 17:17:03 CET 2013     fk_at_r500.local:/usr/obj/usr/src/sys/ZOEY  amd64
> --------------------------------------------------------------
> >>> World build completed on Tue Feb  5 21:33:55 CET 2013
> --------------------------------------------------------------
> 
> real	261m25.904s
> user	189m2.690s
> sys	22m46.777s
> 
> # FreeBSD r500.local 10.0-CURRENT FreeBSD 10.0-CURRENT #547 r+21d959a: Sun Feb 10 16:00:14 CET 2013     fk_at_r500.local:/usr/obj/usr/src/sys/ZOEY  amd64
> --------------------------------------------------------------
> >>> Kernel build for ZOEY completed on Sun Feb 10 21:41:31 CET 2013
> --------------------------------------------------------------
> 
> real	18m34.822s
> user	12m13.900s
> sys	2m14.028s
> 
> fk_at_r500 ~ $expr 261 / 71
> 3
> 
> I agree that it "feels" worse, though.
> 
> Disclaimer: These aren't "benchmark" results, I didn't create them in
> single-user mode and various relevant factors vary. I also didn't run
> the numbers through ministat and don't intend to either.
> 
> > Was it in 2009 when I could compile world in a few minutes on my quad
> > core. The same machine takes now hours despite having more memory.
> 
> I'm using a Core(TM)2 Duo CPU T5870 _at_ 2.00GHz and don't remember
> ever being able to compile world in a few minutes. The bottle
> neck on my system seems to be the puny 2 GB of RAM the linker
> has to share with ZFS.
> 
> At least I can still buildworld without first attaching an USB
> stick for additional swap space which is necessary for Firefox ...

I also dislike that src build times increased over the years since I run
CURRENT on my notebooks (starting 7-CURRENT, now 10-CURRENT).
Wouldn't it be possible to add a
DO_NOT_BUILD_CLANG_AND_GCC_IF_NOTHING_CHANGED= yes switch to src.conf?

Building clang takes ages and gcc is also pretty big...