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Incorporation of ESMF in CCSM

Incorporation of ESMF in CCSM. Erik Kluzek CCSM SEWG Meeting February 4, 2003. Outline. Design of current CCSM Design of CCSM main program using ESMF Main tasks -- subroutinization, coupling, utilities Subroutinization Coupling Utilities Implementation plan. Current CCSM.

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Incorporation of ESMF in CCSM

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  1. Incorporation of ESMF in CCSM Erik Kluzek CCSM SEWG Meeting February 4, 2003

  2. Outline • Design of current CCSM • Design of CCSM main program using ESMF • Main tasks -- subroutinization, coupling, utilities • Subroutinization • Coupling • Utilities • Implementation plan

  3. Current CCSM CAM2Atmosphere Model CLM Land Model CSIM Sea-Ice Model CCSM Coupler POP Ocean Model

  4. CCSM Design with ESMF • Single Executable • The CCSM application (main program) creates models (atmosphere, land, sea-ice, and ocean) as ESMF sub-components • Models run concurrently and pass data to a flux component (flx). • Transforming data between components is done in the ESMF coupler layer.

  5. CCSM with ESMF

  6. Details of a component

  7. ESMF Terms • Component A computational entity associated with a physical process or function (such as land-model). There are three types: Application, Gridded, and ESMF Coupler components. • Layout A list of Processors and decomposition strategy (threads and tasks). • Import State The data a component requires from other components to run. • Export State The data that a component will supply to other components

  8. Processor Layouts

  9. Outline of CCSM Application • Create application component and retrieve initial layouts for each component. • Read in the global resource file (“namelist”). • Create each component and associate the initial, run, and finalize methods. • Initialize ESMF coupler component and get transforms for each component. • Initialize the clock information (start, stop, reference times) • Set the clock alarms to go off on the coupling intervals. • Run the initial methods for each component (components set own time-step). • Do the initial send and receive. (Either, use transforms or call coupler methods at application layer) • Run the run method for each component (Run until either: clock stop-time, time-interval input, or number of model time-steps input. • Run the final method for each component. • Do the final send and receive. • Run the destroy method for each component.

  10. Main Tasks • Subroutinization -- Divide each model component (atm, ocn, ice, lnd, and flx) into initial, run, and finalize subroutines. The interfaces to these subroutines will be set by ESMF. • Coupling -- Replace MPI/MCT coupling subroutines with ESMF equivalents. • Utilities -- Implement utilities such as: Log, Error, Performance-Profiling, IO, Time manager, Communication and Config attributes into CCSM models.

  11. Subroutinization • Each model decomposed into initial, run, and final subroutines. • The interface to these subroutines is standardized by ESMF (some standard and some optional arguments). • Interfaces accessible from a module.

  12. Coupling • Models become components. • Models fill export states and query import states. • ESMF coupler created to send/receive data between components. • Communication done using ESMF Transforms which act on ESMF States (import or export states)

  13. Some utilities will be implemented in CCSM using csm_share code as a wrapper layer. Fields, Bundles, Grids, States, Communication and Transforms for coupling Time manager for most models (POP?) Log, Error, PerfProf Config Attributes Utilities

  14. Implemention Plan • Pseudo-code development of CCSM -- 1st qtr 2003 • Move to CPL6 -- 1st qtr 2003 • Subroutinize models -- April 2003 • ESMF calendar in ESMF branch for CAM,CLM,CPL --- 2nd qtr 2003 • Prototype ESMF superstructure in CAM -- 2nd qtr 2003 • Prototype ESMF superstructure in CPL6/dead model -- 3rd qtr 2003 • Implement shared code using ESMF infrastructure -- April 2004 • First pass at ESMF coupling in CCSM on ESMF branch -- 1st qtr 2004 • Move ESMF branch to production model versions -- 2nd qtr 2004

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