[Llvm-bgq-discuss] Status of OpenMP support in BG/Q

[Hal Finkel]

Michael,

Our bgclang build have had OpenMP support integrated for quite some time. Please feel free to grab recent packages from http://trac.alcf.anl.gov/projects/llvm-bgq, pass -fopenmp, and let me know how it goes.

 -Hal

----- Original Message -----
> From: "Michael Schlottke" <m.schlottke at fz-juelich.de>
> To: llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Thursday, February 6, 2014 9:55:43 AM
> Subject: [Llvm-bgq-discuss] Status of OpenMP support in BG/Q
> 
> 
> Hi Hal,
> 
> 
> Since the clang-omp team announced support for Clang 3.4 today I was
> wondering what the status is of OpenMP support for clang on BGQ? Are
> there any efforts going in this direction? And if not, is it due to
> a lack of interest or because it is too difficult/time consuming to
> do?
> 
> 
> I am asking since we finished some performance tests of mpixlcxx vs
> mpiclang++ on the BGQ in Jülich and found that even with -O5 for the
> XL compiler, the single-core runtime of the clang-compiled
> executables is usually only less than 5% higher. We are therefore
> thinking about dropping support for IBM's XL entirely, since it's
> the only compiler holding us back from C++11.
> 
> 
> Regards,
> 
> 
> Michael
> 
> 
> P. S. : If anyone is interested in the above-mentioned numbers,
> please let me know.
> 
> 
> 
> 
> 
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory