[Dune-devel] ICC to be replaced by LLVM-based oneAPI DPC++

[Simon Praetorius]

Hi Christoph,

after your mail, I have started a tryout. It seems to work smoothly with 
my setup, including dune-functions (and AMDiS). Those were not possible 
to compile with the old intel icc compiler, due to internal compiler 
errors in valid c++14 code. But with the llvm based compiler, these 
errors seem to be vanished. I have not tested the most recent icc 
compiler 2021.2, though.

The Intel package comes with MKL and intel mpi library. These are 
detected right away. But, one needs to recompile mpi-based libraries, 
e.g., ParMETIS and PTScotch, due to incompatibilities of the intel-mpi 
and system mpi version. But, this is a normal situation you always face 
when mixing libraries. Setting the user-compiled libraries in cmake 
works also out-of-the-box.

So, for the release/2.8 the core, some staging and extension libraries 
work with this intel llvm-based compiler.

Best regards,
Simon

Am 11.08.21 um 15:59 schrieb Christoph Grüninger:
> Hi fellow Dune developers,
>
> Intel announced that they stop further development of their ICC C++
> compiler. ICC has been received as a compiler creating the fasted
> executable in many cases.
> Intel will invest in the development of their LLVM-based oneAPI DPC++
> compiler, which should be slightly faster in compilation and still
> outperform GCC and LLVM.
>
> More details:
>
>> https://www.phoronix.com/scan.php?page=news_item&px=Intel-LLVM-Adoption-C-CPP
>> https://software.intel.com/content/www/us/en/develop/blogs/adoption-of-llvm-complete-icx.html
> Has anyone already tested Dune with this new compiler? At some point in
> time, we should no longer supporting ICC but the new one.
>
> Bye
> Christoph
>
-- 
Dr. Simon Praetorius
Technische Universität Dresden
Institute of Scientific Computing
phone: +49 351 463-34432
mail: simon.praetorius at tu-dresden.de
web: https://tu-dresden.de/mn/math/wir/das-institut/beschaeftigte/simon-praetorius


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