4.0.x FeatureList

Initial list is based on discussion from the Dallas March 2018 face-to-face meeting.

Release Managers

• Geoff Paulsen: IBM
• Howard Pritchard: LANL

Timeframe

• June 12, 2018 - Readiness Review - Review unfinished features on feature list to raise visibility, get rough sense of is/is not and evaluate readiness.
• July 18, 2018 - Branch from master No new features on release branch past branch point.
• July 22, 2018 - All MTT testing online.
• Sept 7, 2018 - create RC1 (shoot for 2 week RC intervals)
• Sept 17, 2018 - Release.

New features proposed for v4.0.x:

• UCX Cuda support - want this to be something that works when Open MPI v4.0 releases.
  • Need to check if datatype support that UCX provides, matches with what open mpi converters supports.
  • UCX 1.4 - Late Sept or Early Oct.
• (UTK/LANL) UCT BTL (i.e., lower layer of UCX) - George
  • This allows us to remove openib BTL
• (LANL) Modify OpenIB BTL to only look for RoCE/IWarp devices unless told otherwise. - Howard
• Latest PMIx
  • PMIx 3.0.x slated for summer 2018 (well how much do we really need this?) Can ULFM just use external PMIx?
  • Include PMIx debugger support
    • This allows us to start deprecating MPIR (i.e., add to NEWS -- next major version can output warnings when MPIR is used).
• Support for hwloc v2.0.x
  • Jeff and/or Geoff
• (UTK) SPC - Software Performance Counters (looks good) - need documentation!
• Possible MPI-3.2 functionality (depends on the MPI Forum)
  • (Fujitsu) Persistent collective operations (with MPIX_ prefix)
• OSHMEM - Mellanox
  • Update to v1.4 API
  • Do not build OSHMEM if a viable SPML cannot be built
• Remove the MXM MTL - Brian
• Update ROMIO - Looking for owner (Gilles, or Geoff)
• Improved performance for single and multi-threaded RMA when using osc/rdma. - Nathan
• OMPIO new vulcan fcoll component - Edgar
• OMPIO Cuda buffer support - Edgar
• OMPIO Luster component updates - Edgar
  • Edgar recommends keeping ROMIO as default for IO when Luster is detected.