CCPP Framework Meeting Minutes 2021 10 14

Agenda

(Dom on leave today, running Mt. Sanitas during the meeting)

• Transition to capgen.py
• Criteria for adding new physics to CCPP physics repository
• Dictionary of standard names
• Metadata section in CCPP technical documentation

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Transition to capgen.py

• GitHub project "capgen unification" https://github.com/NCAR/ccpp-framework/projects/3
• Created a new issue to capture the work on implementing the var_action class
• Steve and Dom need to come up with estimated on how long the different tasks take
• Navy would like to use capgen in their first operational implementation, but the implementation window is closing fast (when?)
  • Dom sent an email to Alex (Oct 5) to ask about this - no reply yet
• Navy also wants to add RAMS microphysics to CCPP physics repository
  • Dom also asked Alex about this (who ports it, who tests and maintains it) - no reply yet
• New feature in ccpp_prebuild.py: debugging feature to help detect unallocated or wrongly allocated arrays
  • Code is generated if --debug is added to ccpp_prebuild.py
  • Old --debug flag is now --verbose (because this is what it does)
  • Optional to be implemented in capgen.py for the transition, can be done later
  • PR https://github.com/NCAR/ccpp-framework/pull/404
  • prebuild issue https://github.com/NCAR/ccpp-framework/issues/405
  • capgen issue https://github.com/NCAR/ccpp-framework/issues/406

Criteria for adding new physics to CCPP physics repository (from last week)

• Being tested and maintained by someone using one or more models
• Regression testing: what does it mean/encompass?
• Follow CCPP requirements
• Runtime performance and other computational criteria?
• Scientific value? This is very difficult to decide, may depend on host model, ...
• Relates to ongoing CCPP physics governance discussion

Dictionary of standard names (from last week)

• New standard names from MPAS porting efforts
  • Every name in every scheme is now uniquely identified across all schemes for MPAS
• Dave will create a PR for their variables to CCPPStandardNames
  • How do we handle duplicates? By definition there can't be any duplicates
  • Differences w.r.t. rules for composing standard names (prefix vs suffix)
  • Can we start with schemes that are already in both NCAR ccpp-physics main and MPAS
    • For conflicting names, decide which is better and update the dictionary, existing modeling systems and rules accordingly

CCPP technical documentation section on metadata

• CCPP metadata is becoming more complex, we should dedicate a section to it in the CCPP technical documentation
• With Julie retiring, we will give this task to the new CCPP doc lead (yet to be determined)