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POP People P. Malone, P. Smith, P. Maltrud, P. Jones, P. Davis, P. Baumgardner, P. Dukowicz

Phil’s Promised Presentation on POP’s Present Progress, Performance and Penultimate Post-present Plan. POP People P. Malone, P. Smith, P. Maltrud, P. Jones, P. Davis, P. Baumgardner, P. Dukowicz. Past/Present. Bryan-Cox-Semtner z-coordinate

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POP People P. Malone, P. Smith, P. Maltrud, P. Jones, P. Davis, P. Baumgardner, P. Dukowicz

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  1. Phil’s Promised Presentation on POP’s Present Progress, Performance and Penultimate Post-present Plan POP People P. Malone, P. Smith, P. Maltrud, P. Jones, P. Davis, P. Baumgardner, P. Dukowicz

  2. Past/Present • Bryan-Cox-Semtner z-coordinate • Introduced features like free surface, pressure-averaging, implicit surface pressure formulation, etc. • General grids (dipole, tripole, icos) • Added (and improved) GM, KPP, anisotropic viscosity, variable sfc layer, partial bottom cells, new EOS and time manager • Publicly available (version 1.4.3) http://climate.acl.lanl.gov/models/pop

  3. POP Purpose • High Resolution Simulations • Global 0.28, 0.1 (Bert) • North Atlantic 0.4, 0.2, 0.1, 1/15 • Wind-driven circulation, eddy processes, performance • Coupled Simulations (CCPP) • NCAR CCSM/PCM (Peter), CSU, UCLA, CICE • Long times, parameterizations, performance, inter-model • Homeland Security

  4. POP 2.0 • Gates release • Partial bottom cells • New EOS • Tripole grids • Performance • Hybrid OpenMP/MPI • Better cache performance • Land point elimination

  5. POP 2.0 • Sub-block decomposition • Domain decomposed into blocks sized for cache (or vector) • Land blocks eliminated • Remaining blocks distributed in load-balanced manner using a rake algorithm • Priorities can be set to maintain some locality during rake • Many blocks on each node provide OpenMP parallelism • Block loops at high level to amortize OpenMP overhead • Different block distribution used for barotropic solver to optimize for communication rather than load balance

  6. Actual Performance • 0.1 Global

  7. POP x1 Performance MLP?

  8. Future Improvements • Hybrid Vertical Coordinate (ALE) • Lagrangian vertical coordinate • Remap (infrequently) to arbitrary coordinate • New incremental remapping advection • Conservative, monotone scheme • Inexpensive for many tracers • Explicit barotropic split • Two-time-level (no mixing, smaller restart)

  9. Future Improvements (cont.) • New Tracer Structure for Biogeochemistry (NOPP, SciDAC, CCSM) • Icosahedral Grid (SciDAC CSU) • CCSM SciDAC • SciDAC ISICS (grids, performance, CCA) • ESMF Compliant

  10. Interactions NOPP SciDAC LANL SCRIP NCAR PRISM CSU POP NPS CICE ORNL UCLA CCPP ANL CCSM LLNL ESMF

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