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

[Schlottke, Michael]

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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