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Conference call notes 20180314

Kenneth Hoste edited this page Mar 14, 2018 · 2 revisions

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Notes on the 97th EasyBuild conference call, Wednesday March 14th 2018 (5pm - 6pm CET)

Attendees

Alphabetical list of attendees (5):

  • Victor Holanda (CSCS)
  • Kenneth Hoste (HPC-UGent)
  • Adam Huffman (Big Data Institute, University of Oxford)
  • Bart Oldeman (ComputeCanada)
  • Davide Vanzo (Vanderbilt University, US)

Agenda

Enable -ftree-vectorize by default?

  • see https://github.com/easybuilders/easybuild-framework/pull/2388
  • no vectorization by default when using GCC...
    • lost performance on systems like Skylake
  • some concerns w.r.t. FP accuracy
    • OK with default options
  • just adding -ftree-vectorize is not enough to get most out of it
    • we could also consider adding -fno-math-errno (does not affect accuracy)
  • has been used at ComputeCanada for a couple of weeks, no issues found
  • tested at CSCS with GROMACS, regtest still passes
  • KH will test with CP2K and foss/2018a
  • Victor: what about Clang/PGI?
  • seems OK to merge to include in EasyBuild v3.6.0...

Added check in easyconfigs test suite to enforce single dependency variant per toolchain generation

Other

  • Victor
    • ETA for next release (which includes -ftree-vectorize)?
      • v3.6.0 is planned for mid April'18, may be pushed a little bit earlier if there enough demand...
    • change bi-weekly schedule to avoid clash with GROMACS conf call?
      • will stick to planned dates in April (11th + 25th) for now
      • can consider skipping a week starting May to shift schedule with 1 week
    • --job-max-jobs support for EB v3.6.0?
    • ways to contribute?
    • filter OS deps via hooks?
      • validating OS deps is done while parsing easyconfig file
      • no hook yet to intervene, could add post-parse hook for that purpose?
    • how to handle EasyBuild configuration & easyconfigs for different platforms (x86, ARM, Cray, ...)?
      • good question for mailing list, could collect info for best practices document on this?
  • Bart
  • easyblock for OpenMPI?
    • --with-verbs vs --without-verbs based on available libraries
      • may need to be careful, don't want to build without IB support by accident...
    • SLURM integration: PMI2 vs PMIx (required for srun)
      • for PMIx, both SLURM & OpenMPI need to be built against sam hwloc
        • only matters with really big jobs (10k+)
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