On Tuesday 21 April 2009 17:37:50 David Naylor wrote:
> On Tuesday 21 April 2009 10:32:04 Mel Flynn wrote:
> > Hi David,
> > On Monday 20 April 2009 21:48:39 David Naylor wrote:
> > > There has been an article recently published by phoronix
> > > (http://www.phoronix.com/scan.php?page=article&item=pcbsd_vs_kubuntu&nu
> > >m= 1) that compares PC-BSD to Kubuntu. Kubuntu uses GCC 4.3.3 compared
> > > to FreeBSD's GCC 4.2.2. There is a considerable performance difference
> > > between the two OS's, the article contributes this difference to the
> > > compiler.
> > Nice shot in the dark, since except the calculations a lot of these are
> > influenced by "journaled FS vs stock UFS".
> I know, benchmarking anything but the simplest things are influenced by too
> many factors. Pity it doesn't provide an unbiased comparison of FreeBSD
> and Linux.
That and comparing apples and pears as default configured fruit, don't usually
work well. Of course it appeals to the end user "which fruit is healthier".
> > > In order to check if this is so (and to get the speed improvements of
> > > GCC 4.3+) one needs to compile the ports (and preferable world/kernel
> > > as well) with GCC 4.3+.
> > It's license is incompatible with world/kernel.
> What type of incompatibility. I know FreeBSD has reservations about GPLv3
> (I personally don't understand why everyone cannot be friends and use BSD
> Licenses). So is this a policy incompatibility or a legal one (i.e. would
> it be 'illegal' for me to use GCC 4.3+ to compile world/kernel, as an
> end-user/consumer of FreeBSD). I assume the same discussion applies to
Policy. Only legal issue in FreeBSD for the end user is WITH_IDEA.
> > That said, install
> > lang/gcc43 and set CC/CXX for ports. World/kernel would be a lot harder.
> > Maybe setting WITHOUT_GCC in /etc/src.conf and setting CC/CXX would work,
> > but there's quite a few modifications to gcc that aren't in ports
> > lang/gcc, so I have my doubts.
> I suppose it would be nice if there was an easy way to use an out-of-source
> compiler in FreeBSD. Like set PORTS_COMPILER=gcc43 and the port will
> installed and used... One may have dreams.
cat <<'EOF' >> /etc/make.conf
Pretty close, huh?
> > > Is there an easy way to set this up and does anyone know the
> > > compatibility of world/kernel/ports with GCC 4.3+?
> > >
> > > Also has anyone tried this and benchmarked the result?
> > Not me, but be sure to stick around for the new non-gcc compiler coming
> > to a FreeBSD near you. And with the work done by Marcel Molenaar on
> > gpart, hopefully we can have ZFS and gjournal as choices in the
> > installer.
> You mean llvm, waiting patiently. I suppose my suggestion above will
> become even more important (at least for compiling ports) since it will be
> a while till llvm has decent c++ support.
Yeah, I don't know how that's gonna work if llvm is ready for base, but no
c++. I guess we'll have to sit out g++ 4.2 for a while. If you're in the
position to do so, I'd do their benchmarks with ZFS and see how much
difference that already makes.
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