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Code 930 Support for GMI

Learn about the essential coding standards, access procedures, and resources related to GMI code support for the Earth System Modeling Framework. Enhance familiarity with the system’s architecture and best practices for streamlined execution.

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Code 930 Support for GMI

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  1. Code 930 Support for GMI Tom Clune (NASA) Bigyani Das (CSC) Jae-Hoon Kim (CSC)

  2. Status • GMI production runs are routinely and capably executed by 930 staff. • Gaining significant familiarity with code, but still reliant upon LLNL for some code modifications. • LLNL support continues to be excellent. • Staffing is currently low (1.5 vs 2.3 FTEs) • Atmospheric Chemistry is becoming separate “sector”.

  3. NCCS Resources provided to GMI • GMI web site • Data archival and community FTP service • HEC - HP/CPQ alpha cluster • Source repository • Semi-private document bulletin board • Mailing lists

  4. NCCS UserIDs • Required to access the GMI data archive and source repository • To obtain: • Fill out online form: <http://nccstag.gsfc.nasa.gov/…> • Use Sponsor Code Account: “a930b” • Request access to “sourcemotel” under “other platforms” • Print, Sign, and Fax forms • After creation of sourcemotel account contact Thomas.L.Clune@nasa.gov to be added to GMI project (for access to repository and bulletin board)

  5. Sourcemotel • Live demonstration?

  6. Existing Coding Standards (LLNL) • Any include files need a ".h" suffix; use a ".F" suffix for the other source files. • Use the "# include" preprocessor declaration to bring in include files. • Use "implicit none"; declare all variables. • All real declarations need to be "real*8" (including function returns). • Change any "e" exponents to "d"; add "d0" to any real numbers that don't have an exponent. • Do not use the "Real" or "Float" intrinsic function; just assign the variable, etc. to a variable that is declared as real*8. • Use generic calls for any intrinsic functions (e.g., use Max, not Amax1). • Use our gmi_phys_constants.h file for all common physical constants. • Put a "c $Id: README.softw,v 1.1.1.1 2003/06/12 14:24:29 oloso Exp $" at the top of each file that will be archived.

  7. Coding Standards Document • Living document to be added to repository. • Possibly contradicts some extant GMI software. • Items either mandatory or strongly encouraged. • Areas of concern: • Portability/Safety • Avoid non-standard implementations • Use implicit none, etc. • Encapsulation - pass all data through interfaces • Numerical accuracy • Parallelization • Software engineering (where to put things and what to call them). • ESMF?

  8. ESMF Background NASA’s Earth Science Technology Office proposed the creation of anEarth System Modeling Framework (ESMF) in the September 2000 NASA Cooperative Agreement Notice: “Increasing Interoperability and Performance of Grand Challenge Applications in the Earth, Space, Life and Microgravity Sciences” A large, interagency collaboration with roots in the Common Modeling Infrastructure Working Group proposed three interlinked projects to develop and deploy the ESMF, which were all funded: Part I: Core ESMF Development (PI: Killeen, NCAR) Part II: Modeling Applications (PI: Marshall, MIT) Part III: Data Assimilation Applications (PI: da Silva, NASA GMAO)

  9. ESMF ESMF Project Description GOALS: To increase software reuse, interoperability, ease of use and performance portability in climate, weather, and data assimilation applications PRODUCTS: • Core framework: Software for coupling geophysical components and utilities for building components • Applications: Deployment of the ESMF in 15 of the nation’s leading climate and weather models, assembly of 8 new science-motivated applications METRICS: RESOURCES and TIMELINE: $9.8M over 3 years

  10. Architecture ESMF Components Layer: Gridded Components Coupler Components ESMF Superstructure • ESMF provides an environment for assembling geophysical components into applications. • ESMF provides a toolkit that components use to • increase interoperability • improve performance portability • abstract common services User Code Model Layer ESMF Infrastructure Fields and Grids Layer Low Level Utilities External Libraries BLAS, MPI, NetCDF, … • Becoming an ESMF Component • Pack model import and export data into ESMF data structures and conform to a standard calendar. Use ESMF utilities internally as desired. Organize model using standard ESMF methods: Initialize, Run, Finalize, ReadRestart, WriteRestart. Methods may be multi-phase (Run phase=1, Run phase=2). Method interfaces are prescribed. • Instantiate an ESMF Component with name, type, config information. Register standard model methods with Component. If desired, register data. • Use ESMF AppDriver to sequence and run Components.

  11. ESMF Time Line

  12. ESMF & GMI • ESMF superstructure is the preferred technology for coupling new components/modules. • ESMF infrastructure • Potentially useful • Considered on case-by-case basis • Leverage GSFC GMAO support for Lin-Rood dynamical core • Possibly reduce “technology hysteresis” with contributing members.

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