Telcon: 2026 03 25 - spack/spack GitHub Wiki
Wednesday March 25th, 9am PT (UTC -7:00)
Invite Link: https://zoom.us/j/93354081914?pwd=kkovIeyqQPkb9KgQUKKgOnV3kWafS0.1
Attendees
- Peter Scheibel (host)
- Brad Richardson
- Tammy Dahlgren
- Mark Krentel
- Alec Scott
- Greg Becker
- Massimiliano Culpo
- Samuel Browne
- Patrick Goetz
- Todd Gamblin
- Diego Menéndez
- Asher Antao
- Yang
Agenda
This is for Q&A: there are currently no pre-planned topics
- Diego: Amber package fix addressing issue discussed in https://github.com/spack/spack/wiki/Telcon%3A-2026-03-11
- Diego: openmpi problem
- slurm/openmpi use pmix to handle processes
- in manual config, this works
- in manual installation, newer pmix chosen
- slurm is system-installed, openmpi/pmix are in spack
- Todd: we should be able to do
spack external find pmix - Greg: there is library-based external detection
- Peter: docs section is https://spack.readthedocs.io/en/latest/packaging_guide_advanced.html#making-a-package-discoverable-with-spack-external-find, but no info on library-based detection
- Example of
libraries =, anddetermine_versionwith a library: - Todd:
strings <the library file> | grep -i "version"- Looks like there is a line there: "OpenPMIx x.y.z"
- Other option: run the
pmix-infobinary- this would be binary-based detection (which is documented above)
- Diego: openmpi + gcc@15 build
- Build is failing
- Todd: newer mpis might require newer pmix (and this constraint might not be recorded)
- Brad: slides from HPSF talk week: https://hpsf2026.sched.com/event/2GmZZ/mixing-and-matching-and-multiple-versions-oh-my-brad-richardson-amentum?iframe=no
- Asher Antao
- Kokkos does not respect module file hierarchy
- Does not end up under gcc, but instead it ends up in core
- It's purely dependent on c++
- I'm on 1.1.1
- Massimiliano: Can you check head of develop: there was an issue with pure c++ packages not following the hierarchy
- Asher agreed to check this, and if it works, it will be backported
- The PR https://github.com/spack/spack/pull/52018
- (this can go into 1.1.2)
- https://github.com/spack/spack-packages/blob/develop/repos/spack_repo/builtin/packages/kokkos/package.py
- Yang: installed gcc w/ spack, generated module with spack, loaded module, but compiler wasn't available
- Peter: not sure what is causing this (we agreed to continue in Spack)
- Patrick: ping on issue installing gcc on ubuntu (couldn't get gcc@15 to install without defining a compilers.yaml)
- Peter: no progress, can you make an issue on this?
- Patrick: have an administrator to install packages
- have users create environments with those packages
- how do I make it so each user puts environments in their ~?
- Asher: I'm using
spack env activate -d .to create an "unmanaged" env, and then pointing those envs to an upstream instance of spack