Telcon: 2023 06 07

Wednesday June 7th, 9am PT (UTC -7:00)

Attendees

• Peter Scheibel (host)
• Richarda Butler
• Davide DelVento
• Phil Regier
• David Gomez
• Jakov Petrina
• Mark Krentel
• Massimiliano Culpo
• Tammy Dahlgren
• Tyler Cruise
• Wileam Phan
• Akhil
• Allen Sanderson
• Brian Van Essen

Agenda

This meeting is just Q&A: there are no pre-planned general Spack topics

• Davide: if I have two Spack instances, how do I isolate the configuration of each
  • Suggestion: customize the config dir inside ~/.spack based on the git commit of Spack itself
  • export SPACK_USER_CACHE_PATH=`pwd`/misc-cache export SPACK_DISABLE_LOCAL_CONFIG=true
  • Question: where is config written when you have export SPACK_DISABLE_LOCAL_CONFIG=true and you don't have an env
• David: spack bootstrap examines PATH, which in my case includes /usr/sbin
  • I cannot ls that directory
  • Can Spack ignore items in PATH?
    • Moreover it examines every element of PATH even if an executable can be found in an earlier item
  • Peter: is it possible to edit PATH to edit Spack
• Phil: in old-fashioned build systems using autoconf, there is a config.log
  • If I look at the "post-mortem" i.e. spack cd <the-package>, is config.log there
  • config.log should be live in the staging dir (you might need to cd to the stage root, which might be just above spack cd <the-package>, where spack-build-out.txt)
  • spack -d install ... will also generate logs of the compiler wrappers in you're CWD
• Wileam: ping on https://github.com/spack/spack/pull/35919
  • How to rpath libgomp when using amdgcn
  • i.e. a gcc instance built with amdgcn support
  • If using it as a compiler in compilers.yaml, you can update the extra_rpaths field
  • If you want users to be able to invoke gcc themselves, then Davide suggested making your own wrapper that RPATHs the libgomp library directory
  • Massimiliano: there is a specs file in the gcc prefix (note: this is not a Spack Spec, but related to a GCC concept)
    • The Spack gcc package modifies this automatically in the write_rpath_specs post-install step (spack install gcc+amdgcn could modify add libgomp when executing this step)
• Allen: working with a Spack-built package with +cuda and trilinos
  • Want to expand it to include HIP support
    • You may have to add several packages
    • spack external find --tag=rocm
  • Added some hip externals: to make sure Spack sees them, you can run spack config blame packages
  • Examples of ROCmPackage classes include: lbann, raja