freebsd stable - Aug 2016 - Benchmarks results for FreeBSD 11

> 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. I certainly can't speak for the
community as a whole - but based on my experience when discussing new
features that adversely impact networking performance my impression is
that out of the box performance is generally not a priority.

-M

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

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