Conference call notes 20200722

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Notes on the 152nd EasyBuild conference call, Wednesday July 22nd 2020 (15:00 UTC, 17:00 CEST)

Attendees

Alphabetical list of attendees (7):

• Adam Huffman (Big Data Institute, University of Oxford)
• Bart Oldeman (Compute Canada)
• Davide Vanzo (Microsoft)
• Jörg Saßmannshausen (NIHR Biomedical Research Centre, UK)
• Markus Geimer (JSC)
• Maxime Boissonneault (Compute Canada)
• Mikael Öhman (Chalmers University of Technology, Sweden)

Agenda

• CUDA 11
• Clang toolchain
• Q&A

CUDA 11

• The problem: gcccuda would depend gcc and gcccorecuda which means that there is a UCX at GCCcore, and a CUDA-enabled UCX at gcccorecuda Will it work with --minimal-toolchains?
• Using CUDAcore + dummy CUDA to share installations
  • https://github.com/easybuilders/easybuild-easyconfigs/pull/10935
• Introduction of gcccorecuda https://github.com/easybuilders/easybuild-framework/pull/3385

Clang toolchain

• Markus Geimer @geimer has started to work on this: https://github.com/easybuilders/easybuild/issues/640
• Use external LLVM for Clang? Maybe.
• Put it under GCCcore? Probably yes.
• Include Flang or rely on GCCcore's gfortran for any potential fortran codes.
• Default to libstdc++ or libc++? Maybe needs to stick to libstdc++ for compatibility
• Conclusion: Open a PR and go from there.

Q&A

• Markus Geimer: Has anyone looked into GCC with GPU offloading?
  • Maxime: Yes we have it at Compute Canada https://github.com/ComputeCanada/easybuild-easyconfigs/blob/computecanada-master/easybuild/easyconfigs/g/GCC/GCC-9.1.0-CUDAcore-10.1.243-offload.eb
  • Any reason why we don't include this in GCCCuda? Probably because noone asked for it yet, but it seems tempting.