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Agenda Notes Monday December 18th 2017 11:00 AM

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Michael Duda edited this page Dec 18, 2017 · 7 revisions

MPAS-Developer Telecon:

Date: 18 December 2017
Time: 11:00 MDT / 19:00 CET

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

Agenda Topics:

  1. Framework modifications:
  2. Discuss E3SM/MPAS repo set-up
  3. Short report on MPAS-A speed-ups when switching to grouped halo exchanges
Version         36      72      144     288     576     1152    2304
v5.2-opt        567.36  268.62  123.54  57.21   27.72   13.77   7.1
grouped-halos   562.15  266.27  123.34  58.44   26.98   13.65   6.92

Notes from the previous meeting:

Monday, 11 December 2017 @ 11:00 MDT

Notes:

Participants: Adrian, Matt, Mark, Michael

Framework PRs

  • PR 1462 - Mark will try to reproduce the problem on Cori.
  • PR 1453 - Approved.

Grouped halo exchanges

  • MPAS-Atmosphere timings for the dynamics, which have essentially all of the halo exchanges in MPAS-A, are show in Item 3 of the agenda. These numbers are from global simulations on the x1.40962 mesh on NCAR's Cheyenne system using the Intel compilers and SGI MPT. There doesn't seem to be a clear speed-up when grouping halo exchanges.
  • Depending on machine, MPI library, etc., perhaps grouped halo exchanges need more exchanges to be grouped together to show large improvements?
  • Adrian will soon have performance measurements with grouped halo exchanges for MPAS-Seaice when using up to ~20,000 cores of Cori (or Edison?)

E3SM/MPAS repository considerations

  • E3SM will make use of a completely open development model
    • How might we handle the MPAS repository and its interaction with the E3SM repository?
  • We will probably need recommendations in the January - February time frame
  • We'll start a brainstorming document (Google Doc) to discuss pros/cons of options for repo management
  • Plan for a high-level telecon on 29 January

Next Telecon

Monday 8 January 2018 @ 11:00 MDT

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