Date: Tue, 24 Feb 2004 11:49:36 +1100 From: Tony Frank <tfrank@optushome.com.au> To: D J Hawkey Jr <hawkeyd@visi.com> Cc: freebsd-questions@freebsd.org Subject: Re: Clarification needed on Handbook: Tracking for Multiple Machines Message-ID: <20040224004936.GB48674@marvin.home.local> In-Reply-To: <20040223164607.GA29519@sheol.localdomain> References: <20040222150723.GA25548@sheol.localdomain> <20040222161211.GB35539@marvin.home.local> <20040222172039.GA25979@sheol.localdomain> <20040223.091205.31502112.imp@bsdimp.com> <20040223164607.GA29519@sheol.localdomain>
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Hi,
On Mon, Feb 23, 2004 at 10:46:07AM -0600, D J Hawkey Jr wrote:
> On Feb 23, at 09:12 AM, M. Warner Losh wrote:
> >
> > In message: <20040222172039.GA25979@sheol.localdomain>
> > D J Hawkey Jr <hawkeyd@visi.com> writes:
> > : True or False: Setting CPUTYPE to the lowest target CPU ("p2") in
> > : a build machine's make.conf will cripple the performance of target
> > : machines with higher CPUs ("p3", "p4", "i586", "i686", etc.).
> >
> > False. It might have a minor impact on performance, but not a major
> > one. At least in my experience. Minor here means < 10% for something
> > like the world stone. Cripple to me implies > 25%.
>
> OK, thanks. Just to satisfy my anal-retentive side, would that ~10%
> degradation be a higher level of performance on a PIII (or higher)
> with no CPUTYPE specified at all, given the same *FLAGS?
Perhaps the easiest option is to actually try it and see what the results
are?
> > : If "True", for optimized code across all machines, the code should
> > : just be built on each machine, right?
> > That would give slightly better performance. However, it can be more
> > pain than it is worth if the number of machine types is high.
> Consuming considerably more time and disk space, a shell script to
> alter make.conf and rename /usr/obj between the build for each machine
> is doable, though pro'lly not worth it. The install at each each box
> would just have to mount it's corresponding /usr/obj tree.
Just need to set __MAKE_CONF and MAKEOBJDIRPREFIX before running the build.
Regards,
Tony
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