CCPP Framework Meeting Minutes 2020 09 29

Agenda

• cap_gen.py progress
• transition to cap_gen.py
• CCPP announcements mailing list
• other business

cap_gen.py progress

• not much progress due to Hurricane Supplemental work
• need to go through open issues next week to prioritize/add/remove as needed

Transition to cap_gen.py

• DTC timeline and resource chart (https://docs.google.com/spreadsheets/d/1XbSF1ejYcPMrVtZtk1OSiMX-vI5srLkwEUhyAirGr8k/edit?usp=sharing)

• things that need to happen for transitioning UFS to cap_gen.py (https://docs.google.com/document/d/1M3mCO3ESR9OJqLyUbQf-ahJtmfmGKilZlWaBTxsfMRk/edit?usp=sharing)

• (from almost four weeks ago) Xia working on assumed-size array declarations

  • several test failures and crashes
  • Dom needs to get started on this, use full compiler debug flags

• Dom created a feature branch feature/transition-to-capgen-1 under the NCAR GitHub account to collect the following PRs:

  • Grant's removal of GFS DDTs is ready to review and in the commit queue - https://github.com/NCAR/ccpp-physics/pull/493
  • Man's cleanup/fix of units is ready to review (draft PR)? (see also the standard names spreadsheet below) https://github.com/NCAR/ccpp-physics/pull/496; contains changes that don't belong in there
  • Xia's renaming of horizontal_dimension to horizontal_loop_extent PR for ccpp-physics is ready to review - https://github.com/NCAR/ccpp-physics/pull/498

• Consolidation of standard names (Ligia and Grant) - https://docs.google.com/spreadsheets/d/1kWDC7_2sagm-PTP_tXaGyI3O3sJFK8FY9FElQbb6V3o/edit#gid=613941307

  • 2020/09/17: gone through Statein, Stateout, Sfcprop and Coupling so far
  • 2020/09/29: halfway through Control

• need to collect some of these changes in a feature/transition_to_capgen branch and send it to EMC at once (only those that don't change the answer)

CCPP announcements mailing list

• https://groups.google.com/a/ucar.edu/g/ccpp-announce/
• email to ccpp-announce@ucar.edu
• admins (managers): Laurie, Steve, Dom
• initial members: Linlin, Man, Ligia, Grant, Julie, Mike
• currently 32 members
• from 2020/09/17: how do we spread the word - Ligia did all of it!
  • email to GSL modeling group, send to Arun and Fanglin for distribution at EMC
  • DTC staff mailing list, MMM (invite Jimy Dudhia, Dave Gill, Michael Duda, Chris Davis, Laura Fowler)
  • note on CCPP wikis and CCPP website
  • email "usual suspects" (people who submitted PRs, people who submitted questions to gmtb-help)
  • NRL, NSSL, Vulcan (Jeremy), AER (Mike, John Henderson)
  • UFS portal: Ricky, Henrique
  • scientists who contributed code (MG, Thompson, RRTMG, RRTMGP)?
  • Ligia is volunteering!
  • how to sign up?
    • https://groups.google.com/a/ucar.edu/forum/#!forum/ccpp-announce
    • To request to join, send an email to: ccpp-announce+subscribe@ucar.edu
    • or, if one has a Google account (any flavor), there will be an "ask to join group" button on the group/forum page

Other business

• wish list: tool to report / change metadata in bulk operations (e.g. units for a variable etc)
• Dom was asked to "improve the debugging experience" by implementing a check for variables being allocated (correctly) or not, depending on their active attribute, when the code is compiled in debug mode - this will need to be added to cap_gen.py as well. Example:

[ntwa]
  standard_name = index_for_water_friendly_aerosols
  long_name = tracer index for water friendly aerosol
  units = index
  dimensions = ()
  type = integer
...
[qgrs(:,:,index_for_water_friendly_aerosols)]
  standard_name = water_friendly_aerosol_number_concentration
  long_name = number concentration of water-friendly aerosols
  units = kg-1
  dimensions = (horizontal_dimension,vertical_dimension)
  active = (index_for_water_friendly_aerosols > 0)
  type = real
  kind = kind_phys

--> in the cap:

if (ntwa > 0) then
   dummy = sum(qgrs(:,:,ntwa))
end if
! now call subroutine that does something with qgrs(:,:,ntwa) ...

- create issue to add `--debug` flag for `cap_gen.py` to generate debugging code in the Fortran caps - see also https://github.com/NCAR/ccpp-framework/issues/294
- separate from `--verbose` flag
- do not implement in `ccpp_prebuild.py` anymore, go straight to `cap_gen.py`

• wish list / required features for debugging with CCPP: https://docs.google.com/document/d/1PMMFTu__SEaw8BTuq2FAN4p93tP76lwWVsprQmrLRME/edit