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Architecture of the Earth System Modeling Framework

Architecture of the Earth System Modeling Framework. GFDL FMS Suite. MITgcm. NASA GSFC PSAS. NCEP Forecast. V. Balaji / GFDL, Cecelia DeLuca / NCAR, Chris Hill / MIT, Max Suarez, Arlindo da Silva / NASA GSFC EGS - AGU Nice, France. NSIPP Seasonal Forecast. NCAR/LANL CCSM. Outline.

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Architecture of the Earth System Modeling Framework

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  1. Architecture of the Earth System Modeling Framework GFDL FMS Suite MITgcm NASA GSFC PSAS NCEP Forecast V. Balaji / GFDL, Cecelia DeLuca / NCAR, Chris Hill / MIT, Max Suarez, Arlindo da Silva / NASA GSFCEGS - AGUNice, France NSIPP Seasonal Forecast NCAR/LANL CCSM

  2. Outline • ESMF Project Overview • Related Projects and Interactions • ESMF Design Overview • ESMF Design Principles • Timeline and Status

  3. Technological Trends In climate research and NWP...increased emphasis on detailed representation of individual physical processes; requires many teams of specialists to contribute components to an overall modeling system. In computing technology... increase in hardware and software complexity in high-performance computing, as we shift toward the use of scalable computing architectures and open community software standards.

  4. ESMF Project Overview GOAL: To increase software reuse, interoperability, ease of use and performance portability in climate, weather, and data assimilation applications PRODUCTS: • Coupling superstructure and utility infrastructure software • Synthetic code suite for validation and demonstration • Set of 15 ESMF-compliant applications (including CCSM, WRF, GFDL models; MIT, NCEP and NASA data assimilation systems) • Set of 8 interoperability experiments RESOURCES: $10.1M over 3 years from NASA Earth Science Technology Office

  5. ESMF Collaborators NOAA NCEPStephen LordMark IredellMike YoungWeiyu YangJohn Derber MITJohn Marshall, PIChris Hill NASA DAOArlindo da Silva, PILeonid ZaslavskyWill SawyerCarlos CruzUniversity of MichiganQuentin Stout • NOAA GFDLAnts LeetmaaV. BalajiRobert HallbergShep Smithline • NASA NSIPPMax Suarez Michele RieneckerChristian KeppenneAtanas Trayanov • DOE ANL • Rob Jacob • Jay Larson NSF NCARTim Killeen, PIByron BovilleCecelia DeLucaRoberta JohnsonJohn MichalakesAl KellieJeff AndersonDavid NeckelsEarl Schwab Nancy CollinsJon WolfeSilverio VasquezDennis FlaniganRobbie Staufer DOE LANLPhil Jones

  6. ESMF Interoperability Demonstrations

  7. Outline • ESMF Project Overview • Related Projects and Interactions • ESMF Design Overview • ESMF Design Principles • Timeline and Status

  8. Related Projects Larson/ANL DeLuca/NCAR-SCD Jones/LANL Stout/U Mich Killeen/NCAR Drake/ORNL Boville/NCAR-CGD Michalakes/NCAR-MMM Suarez/NASA Goddard Balaji/NOAA GFDL ESMFEarth System Modeling Framework CCADOE Common Component Architecture SciDACDOE/NSF CCSM SciDAC Project GEMSGoddard Earth Modeling System FMSGFDL Flexible Modeling System SWMFSpace Weather Modeling Framework WRFWeather Research and Forecast Model CCSMCommunity Climate System Model PRISMProgram for Int. Earth System Modeling CCA SciDAC PRISM WRF CCSM ESMF FMS GEMS SWMF

  9. ESMF and PRISM • A European Earth system modeling infrastructure project, started December 2001 • Funded by the European Commission ($4.8M) • Involves current state-of-the-art atmosphere, ocean, sea-ice, atmospheric chemistry, land-surface and ocean-biogeochemistry models • 22 partners: leading climate researchers and computer vendors, includes MPI, KNMI, UK Met Office, CERFACS, ECMWF, DMI.

  10. ESMF and PRISM, cont. • Working together to supplement CF convention for physical field names and quantities • Component interface database developed by ESMF stores fields in model import and export states • V. Balaji (GFDL) is ESMF liaison to PRISM

  11. ESMF and CCA • Common Component Architecture (CCA) is creating a minimal interface and sets of tools for linking high performance components. CCA can be used to implement frameworks and standards developed in specific domains (such as ESMF). • DOE funded through SciDAC. • Collaborators include LANL, ANL, LLNL, ORNL, Sandia, University of Tennessee, and many more. Ongoing ESMF collaboration with CCA/LANL on language interoperability. • Shujia Zhou / Arlindo da Silva (NASA GSFC) currently prototyping an ESMF API using CCA tool CCAFFEINE; working towards CAM/DAO PSAS coupling using ESMF and CCA.

  12. Outline • ESMF Project Overview • Related Projects and Interactions • ESMF Design Overview • ESMF Design Principles • Timeline and Status

  13. Architecture Coupling Layer ESMF Superstructure Model Layer User Code Fields and Grids Layer ESMF Infrastructure Low Level Utilities External Libraries BLAS, MPI, NetCDF, …

  14. ESMF Components ESMF provides an environment for assembling geophysical components into an application. Application Component Gridded Components Coupler Components • ESMF provides a toolkit that components use to • increase interoperability • improve performance portability • abstract common services Component: Init( ), Run( ), Checkpoint( ) Field: Halo( ), Import( ), Export( ) + I/O Grid: Regrid( ), Transpose( ) + Metrics Layout, PE List, Machine Model

  15. General Features • ESMF will be usable by models written in F90/C/C++ • ESMF will be usable by models requiring adjoint capability • ESMF will be usable by models requiring shared or distributed memory parallelism semantics • ESMF will support SPMD and MPMD coupling • ESMF will support several I/O formats, including GRIB/BUFR, netCDF, HDF • ESMF will have uniform syntax across platforms • ESMF will target a broad range of platforms, from major centers  commodity hardware

  16. Outline • ESMF Project Overview • Related Projects and Interactions • ESMF Design Overview • ESMF Design Principles • Timeline and Status

  17. Design Principles:Scalable Applications Since each ESMF application is also a component, entire ESMF applications may be treated as Gridded Components and nested within larger applications. climate_comp Example: atmospheric application containing multiple coupled components within a larger climate application ocn2atm_coupler ocn_comp atm_comp phys2dyn_coupler atm_phys atm_dyn PE

  18. Design Principles:Local Communication All inter-component communication within ESMF is local. climate_comp This means:Coupler Components must be defined on the union of the PEs of all the components that they couple. In this example, in order to send data from the ocean component to the atmosphere, the Coupler mediates the send. atm2ocn _coupler ocn_comp atm_comp phys2dyn_coupler atm_phys atm_dyn PE

  19. Design Principles:Modularity Gridded Components don’t have access to the internals of other Gridded Components. Gridded Components may - pass their States through their argument list or - receive methods, through their argument list, for interacting with other Components (Transforms). call ESMF_CompRun(atm, xform) call ESMF_CompRun(ocn, xform) transform coupler ocn_component call ESMF_StateXform(ex_state, & xform) atm_component call ESMF_StateXform(xform, & im_state)

  20. Design Principles:Uniform Communication API The same programming interface is used for shared memory, distributed memory, and combinations of both. Machine model = abstraction of machine architecture (num_nodes, num_pes_per_node) DE = a decomposition element - may be virtual, thread or MPI process Layout = an arrangement of DEs, in which dimensions requiring faster communication may be specified and resources arranged accordingly A 2 x 6 Layout of 4 3-processor nodes The data in a Grid is decomposed into the number of chunks specified in the Layout.

  21. ESMF Class Structure GriddedComponent CouplerComponent Superstructure State Infrastructure Bundle Regrid Field Grid PhysGrid DistGrid F90 Data Communications Route Layout Array Comm C++ More work Prototype exists Utilities: TimeMgr, LogErr, I/O etc. MachineModel

  22. Outline • ESMF Project Overview • Related Projects and Interactions • ESMF Design Overview • ESMF Design Principles • Timeline and Status

  23. Timeline Currently planning for ongoing funding and extensions

  24. May 2003 Release Focus for May 2003 ESMF release is on developing sufficient infrastructure and superstructure to achieve the initial set of interoperability experiments. These are: • FMS B-grid atmosphere coupled to MITgcm ocean • CAM atmosphere coupled to NCEP analysis • NSIPP atmosphere coupled to DAO analysis

  25. More information 2nd ESMF Community Meeting at GFDL May 15, 2003 ESMF website:http://www.esmf.ucar.edu On the website: • Information about the Community Meeting • ESMF documents • ESMF browsable source code repository • On-line forms for community input and catalogued responses • Milestone schedule, project archives and history, related projects • Management plan, board and team contacts • More …

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