2025 11 06 meeting minutes

Attendees: Carl, Nicole, Stephen, Gabriel, Vivek, Hugo

NEXT TIME ON ZOOM

Carried forward from last time

• Today we are still on Teams, but hope to move to HPSF Zoom soon
  • Time seems okay
  • Cedric will move us over to HPSF zoom at some point
  • 11/20 meeting is week of SC, Stephen will cancel
  • 12/4 meeting will be on Zoom hopefully

General Topics

• NCCL CI (Gabriel)

  • UBI9 Image (kind of like RHEL)
    • Carl will add NCCL to the UBI9 image as a first try

• NCCL

  • https://github.com/kokkos/kokkos-comm/pull/183
    • MPI API is in-place, while NCCL is not

• US government Shutdown

  • Sandians may or may not be working in 2 weeks
  • Sandians may or may not be traveling to SC

• SC

  • Cedric will be there
  • Tony, Evan, and Nicole will be there
  • Stephen will be there if travel is allowed

Round Table

• Nicole

  • https://github.com/kokkos/kokkos-comm/pull/181
    • Allow collective communications > rank 1 as long as views are contiguous (matches Trilinos behavior)
    • Gabriel: what does reduce / allreduce / scan mean on rank > 1 views
    • Nicole: will revert scan changes, make the corresponding NCCL changes (remove static checks on rank)

• Gabriel

  • On vacation, probably not doing much until after SC
  • Nothing beyond what's discussed above

• Hugo

  • Cedric said he will do the HPSF Zoom

• Carl

  • Following up about funding

• Vivek

  • Kokkos Tools + LDMS integration:
    • allreduce, scatter/gather collectives would be good
  • Gabriel: latest NCCL has scatter and gather