buildworld build times 10-stable vs. 11-stable

[Ethan Grammatikidis]

On Sun, Jan 15, 2017, at 05:13 PM, Slawa Olhovchenkov wrote:
> On Sun, Jan 15, 2017 at 10:40:42AM -0600, Dan Mack wrote:
> 
> > I have a system which builds world, kernel, install, boot, installworld, 
> > reboot several times per week.   I just noticed that my build times 
> > increased from about (just cherry picking a couple build logs):
> > 
> >    Starting build of FreeBSD SVN [309852]  10.3-STABLE
> >    Kernel will be GENERIC
> >      building world ... 	90:35 0
> > 
> > 
> >    Starting build of FreeBSD SVN [312099]  11.0-STABLE
> >    Kernel will be GENERIC
> >      building world ... 	146:23 0
> > 
> > before I start bisecting the log files, is there something obvious 
> > introduced in 11 that I missed that would explain the roughly 50 minute 
> > difference in my build times?   clang?  additional subsystems?
> 
> lldb/clang and related.

Around 2007 or 2008, I saw a worse jump in compile time when gcc gained specific optimizations for my CPU. There was no clear increase in performance from the optimized software, so I switched back to generic optimizations. I'll be watching out for this now I'm installing FreeBSD.

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