CCPP Framework Meeting Minutes 2024 06 06

Agenda

• GitHub issues/PRs
• New items
• Updates
• Other business
• notes

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Attendees: Mike Kavulich,

GitHub issues/PRs

CCPP Framework (issues, PRs, discussions)

• Constituent updates #549
• Edge case for "none" unit conversions Issue#567
  • Should be straightforward to fix.
• Remove requirement that suite definition file names begin with "suite_" PR#569
  • Waiting on downstream testing/acceptance

Standard names (issues, PRs, discussions)

• Add water variables PR#69
  • Thanks Jesse for getting this merged, sorry to drop the ball on that

New items for discussion

Updates from last time

Previous notes

Other business

Meeting notes

CCPP Framework

• Constituent updates (#549)
  • Waiting to be added to UFS PR - hopefully early next week
  • Also needs official approval from Steve, or possibly will override if he doesn’t approve (Dom to look at repo settings)
• “None” vs “none” edge case
  • Courtney to open PR once we have a development branch - probably change “none” to lowercase before comparison happens
• Remove requirement that SDF file name begins with “suite_”
  • Held up by upstream PRs that need to be opened

Discussion

• New CCPP register phase?
  • Grant - used to have ccpp_init phase in prebuild that initializes data structures, etc
  • Dom - as long as you’re not passing around data, it should be ok to have a phase that is set up the same as the other, existing phases
    • May also want a more formal framework init phase
  • Dustin - where would this be called from the host?
    • Jesse - has to be before the dycore
    • Dom - can implement init phase in UFS that calls the new phase before the call to the dycore
  • Context from NCAR side:
    • We need some way of initializing constituents at runtime, but it needs to happen before the dycore is initialized
  • Dom - internal field table NML (similar to internal namelist object)? Read once at beginning and then passed around.
    • Grant - field table redundant?
  • Michael K - we’ll keep the discussion ongoing, need to discuss details and specifics
  • Jesse - a full new phase would be “easiest” to understand
    • NCAR folks can try to make an example of this phase and open as a draft PR?
      • General agreement
  • Cheryl - what would we want the name to be? Pre-init? Register?
    • Dustin votes “register”
  • Dom - suggests NCAR folks write simple proposal
    • What it’s needed for, super-high-level design
      • Run it by Steve, etc and then implement small test case