CCPP Framework Meeting Minutes 2020 11 24

Agenda

Build updates for unification: https://github.com/NCAR/ccpp-framework/pull/339
This fixed #278 and #293
Now working on #259 and #306, another PR will be #314, #328, #329 and #337
We don't have a plan yet how to handle optional arguments
Also looking at "advective species feature" requested by NRL (#282)
- We should touch base with them in one of the following ccpp-framework meetings; want Cheryl, Dave, Francis, Steve, Grant, Dom as well
- DTC needs to develop a mechanism to avoid using the field_table - use an internal field table approach, similar to the internal input file?

Updated 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 capgen.py (https://docs.google.com/document/d/1M3mCO3ESR9OJqLyUbQf-ahJtmfmGKilZlWaBTxsfMRk/edit?usp=sharing)
Follow up on discussion of last week on removal of optional arguments (or not)
- From two weeks ago: Do we need consent from developers to not support optional arguments? Do we tell developers to not use them right away? Do they need alternatives? Whom to contact? EMC, GSL, Robert & Dustin
- Dom will do - after Thanksgiving
timestep_init, timestep_finalize - Dom is working on this
assumed sizes: Dom needs to take up this PR, update it with the latest code and fix the issues
cleanup of grandfathered stuff (Xia): See https://docs.google.com/spreadsheets/d/1rUMEG0yhZaJvbsl3OawlBzYwLYzo1XBPQfsBZZto63I/edit?usp=sharing
Consolidation of standard names (Ligia and Grant) - https://docs.google.com/spreadsheets/d/1kWDC7_2sagm-PTP_tXaGyI3O3sJFK8FY9FElQbb6V3o/edit#gid=613941307
- No progress since last week

Ligia and Dom met with Georg and Jordan (Schnell); Georg and Jordan are under the impression that ACOM will still use CCPP?
Steve met with SIMA co-leads to seek clarification. Need to distinguish between two different things: (1) Connecting a chemistry suite with a host model will still be done using CCPP (2) How to connect chemistry internally - could use CCPP (we believe that it would be possible to do this) or something else (this seems like what they want to do)
If chemistry connections are done outside of CCPP, this will be a major drawback for collaboration - other efforts at GSL aim at breaking the chemistry up into CCPP components
Complication: chemistry may use complex derived data types, this will require good documentation in metadata for CCPP to work
- CCPP-ized runtime data structures for chemistry arrays - this needs to be worked on
Should we ask the MUSICA working group to give an update in this meeting?
- possibly after MUSICA meeting in early December

CCPP Framework wiki