CCPP Framework Meeting Minutes 2020 12 29

Agenda

Need plan yet how to handle optional arguments (Dom to reach out to developers - EMC, GSL, Robert & Dustin, Phil, NRL)
DTC needs to develop a mechanism to avoid using the field_table - use an internal field table approach, similar to the internal input file? --> Dom to create issue in UFS
Steve working on advective species implementation
- In-progress design document

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)
Dom is making good progress on the timestep_init and timestep_final implementation
- PRs will ready for review
- all tests b4b identical except three!
GFS v16 reference tag created in ufs-weather-model develop code on 12/14/2020 --> IPD removed (at least all source files) on 12/29/2020
Transition at the end of February

Update on CCPP/NUOPC interoperability?
- We are not going to submit a proposal to the NOAA OAR funds through DTC (would have taken too much of the available resources)
- Waiting for other opportunities
GPU capabilities for CCPP
- GFDL working with Vulcan Inc on GPU port of FV3
  - Using DOE resources
  - Done so far: basic port of FV3 to GPU (using GridTools4Py)
  - plan is to drop this dycore into NASA's GEOS model
  - need GPU-enabled physics, possibility to use CCPP
  - Conversation ongoing
- Questions:
  - Which programming paradigm will work for us?
  - Different scenarios: run everything on GPUs, or offload only selected parameterizations (more difficult)
  - For better performance, some work may be needed on the actual parameterizations
Random number generators
- Should CCPP provide a number generator if not provided by something else?
- Or make it an external dependency? Which interface?
- See https://github.com/ufs-community/ufs-weather-model/issues/324
- C++-11 standard: https://en.cppreference.com/w/cpp/numeric/random

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