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Agenda Notes Monday December 5th 2016 11:00 AM

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Michael Duda edited this page Dec 5, 2016 · 11 revisions

MPAS-Developer Telecon:

Date: 5 December 2016
Time: 11:00 MST / 19:00 CET

Call-in number: 1-866-740-1260
Access Code: 4978161

Agenda Topics:

  1. Framework modifications:
  2. Design Document Discussions
  3. Timekeeping issue affecting ACME runs starting in year 1850 has been narrowed down to mpas_calibrate_alarms routine
    • How to fix this?
  4. PIO performance issues with forcing
  5. Proposal for directory structure of test case infrastructure:
  6. Perpetual to-do list:
  7. News/updates:
    • MPAS v5.0 release branch has been created (release-v5.0) with a planned release on 9 December. PRs for cleanup and bugfixes for MPAS v5.0 should target the release-v5.0 branch.

Notes:

  • No objections to the new testing directory structure or the renaming of infrastructure to COMPASS.

  • For PR #1199, we may run into problems with block streams, which make calls to mpas_dmpar_init. It seems that we're overloading the mpas_dmpar_init to initialize the message-passing layer as well as to redirect standard error and output to log files. One possible solution may be to split the logic for redirecting log files into a new routine. See discussion for PR #1199.

  • We'll hold off on code changes to address timekeeping issues in ACME until after ACME has been updated to the latest CIME.

  • Slow forcing I/O performance seems to be a result of terrible performance in PIO when reading xtime variables in MPAS_seekStream (see details in Issue #1156). Using more clever search logic in MPAS_seekStream may help to reduce the number of times that the xtime variable needs to be read; but, we should also follow-up with PIO developers, since even a small number of reads causes a measurable performance hit.

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