COSIMA TWG Meeting Minutes 2023

COSIMA TWG
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Notes from last week’s COSIMA TWG. Feel free to add whatever I’ve missed or to modify anything that I got wrong.

Date : 2023-08-09
Attendees : Micael Oliveira @micael, Andrew Kiss @aekiss, Aidan Heerdegen @Aidan, Paul Leopardi @paulleopardi, Dougie Squire @dougiesquire, Rui Yang @rui.yang, Angus Gibson @angus-g, Harshula Jayasuriya @Harshula, Ezhil Kannadasan @ezhilsabareesh8, Siobhan O’Farrell @sofarrell

MOM6 Test Cases

  • Call is out for MOM6 test cases (see A call for community model configurations that use MOM6)
  • Question about how to do run the tests in practice from a technical point of view (see Technical requirements for MOM6 node testing):
    • How to launch test on gadi now that access-dev is going to be decommissioned? Should we use github actions?
    • ACCESS-NRI is working on setting up CI infrastructure (VM on Nirin running github runners)
    • Tests can be set up while waiting for infrastructure. Start with one test (e.g., Panan) to work out process.
    • Should tests go to a git repository, just like mom6-examples? Too much maintenance?
      • Depends on how similar tests are to production. Should be fairly close, so production configs get tested.
      • Maybe we could patch production configs for tests - eg shorter run, fewer diagnostics
      • We should use Payu. NRI needs to be broader, since other models use rose/cylc.
    • How to deal with cases that aren’t bitwise reproducible, but close enough? We can start with manual checks. MOM6 PR’s usually have notes as to whether bitwise reproducibility is expected
    • MOM consortium requires nomination of someone to sign off on tests. Suggestion for Angus to do it, plus someone else as backup.

ACCESS-OM3 Status

  • Setting up new configuration to be close to OM2
    • grids etc done, JRA55-do done, separate PRs, need to merge once crash is fixed; parameter settings still need attention.
  • Ongoing comparison of ACCESS-OM3 and CIME builds. Still some differences in results, but closing in. Checking compiler flags, including for dependencies.
  • Found mismatched constants between model components
    • defaults in code; can be overridden via input at runtime
    • see what parameters CIME fixes
  • Will tag configurations and executables matching CIME builds as a starting point, and have history for reproducibility.
  • Shioban noted that CICE6-WW3 configuration doesn’t run properly because DOCN needs to supply additional fields, and NUOPC cap for CICE6 needs options to pick up ocean currents from DOCN.

ACCESS-OM3 Release Process

  • A release of ACCESS-OM3 should include all the things needed to reproduce a given run: codebase, spack env, configs, inputs.
  • We would like to have the same version number in all tags
  • Open questions:
    • how to version the inputs?
    • how about CI docker images - tag those?
  • ACCESS-NRI release team working on these issues.
    • If NRI does releases, NRI will take responsibility for tests, updates to software stack
    • OM3 can be a test case to see what works
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