freebsd stable - Aug 2016 - Benchmarks results for FreeBSD 11

On Sun, 28 Aug 2016 14:55:37 +0200
Dimitry Andric <dim at FreeBSD.org> wrote:
> On 28 Aug 2016, at 02:10, K. Macy <kmacy at freebsd.org> wrote:
> >   
> >> The problem here is that Phoronix took a Beta version of FreeBSD
11.
> >> Beta versions have a lot of debugging (malloc, invariants,
witness)
> >> options enabled which make it significantly slower than release
> >> versions. This is even obviously when you run a Beta as a desktop.
It
> >> just feels much slower.  
> > 
> > 
> > I don't know what was going on in these particular tests, but in a
> > more recent benchmarking run
> >
-https://www.phoronix.com/scan.php?page=article&item=freebsd11-clang-gcc&num=1
> > - you're seeing the result of openmp being disabled in base. The
clang
> > maintainer for src refuses to include libomp as required for -fopenmp
> > because nothing in base requires it.  
> 
> Come on, this is nonsense.  I have indicated earlier that I would have
> liked to import openmp into base, but this was shot down precisely for
> that reason: nothing in base uses it.
> 
> So for now, the solution is simply: install one of the llvm ports, and
> use it.  These have configuration setting to install every optional
> component from the LLVM project.
> 
> -Dimitry
> 
With 11, one can even simply install devel/openmp which will only install the
libopenmp bits from llvm, and after that, base cc can do openmp.

-- Matthieu Volat <mazhe at alkumuna.eu>
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>>
>
> With 11, one can even simply install devel/openmp which will only install
the libopenmp bits from llvm, and after that, base cc can do openmp.
This isn't really useful unless the clang in base knows where to find
libomp. Considering that even the devel/llvm ports aren't configured
properly for that I don't see -fopenmp working. Without patching
makefiles or configure. So although this is better than having to
installing a complete copy of the compiler for the sake of a single
library it's still forcing FreeBSD users to jump through extra hoops
that they don't have to with gcc or on other platforms.
-M