CCPP Framework Meeting Minutes 2024 02 05

Agenda

Attendees: Dustin Swales, Ligia Bernardet, Lulin Xue, Courtney Peverley, Michael Waxmonsky, Matthew Dawson, Jesse Nusbaumer, Dom Heinzeller

#526: Add optional attribute to capgen/prebuild
- Two proposed solutions, one for capgen and prebuild; this issue is for capgen
- Reintroduce optional attribute for CCPP physics schemes
- Schemes test for presence of argument if variable is declared optional in metadata
- Scheme metadata must have optional if (any) host model uses active other than default (.true.)
- #529: Draft PR for use of optional attribute in capgen
#527: Add tests for optional attribute
#528: Fortran 2008 MPI interface for CCPP framework and CCPP (UFS) physics
- Incompatibility of MPI communicator type (integer for old MPI, MPI_Comm for MPI F08)
- Currently talking with CCPP users to check if we need to support both (can do via framework, rather ugly)
- If only MPI F08, then #523; if both, then #530
#519: Ready to merge (requires CCPP physics PR as well)
#525 (merged): Add new test for active attribute with array transformation (variable actions)

#57: Steve Sandbach (UKMO) sent a suggestion, need to check if ok with UFS
#49: Resolved for now? Create separate sections for different chemical models and describe the names for these models there
#56: Waiting for Mike K and Grant F to re-review and approve

https://github.com/NCAR/ccpp-physics/issues/1047 - CCPP Framework will no longer support unit "flashes 5 min-1"
- Hold off merging feature/capgen into main?
- Easiest way is to extend the long name and change the units? Will come in via a PR before unification (not anytime soon)
SCM testing with capgen?
- caps generation ok for SCM + GFS v16, build system all hooked up, but code doesn't build (module name differences, problematic for modules with derived data types)
- More features in capgen will need changes in CCPP physics - for example, Fortran parser cannot parse deferred array shapes (e.g. arr(-lsoil:+lsoil))
- Max W's regex changes should help with that (in units checker in feature/capgen branch)
- Another modification of regex needed to allow underscores in units (e.g. degrees_north)

Dom working on converting blocked data structures to contiguous arrays for the UFS
- So far converted about half of the DDTs used in the physics

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