1. Science Computing BranchGoddard Space Flight Center Code 930 Support for GMI Tom Clune (NASA) Bigyani Das (CSC) Jae-Hoon Kim (CSC)

2. Science Computing BranchGoddard Space Flight Center 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. Science Computing BranchGoddard Space Flight Center 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. Science Computing BranchGoddard Space Flight Center NCCS UserIDs Required to access the GMI data archive and source repository To obtain: –Fill out online form: –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) Thomas.L.Clune@nasa.gov

5. Science Computing BranchGoddard Space Flight Center Sourcemotel Live demonstration?

6. Science Computing BranchGoddard Space Flight Center 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. Science Computing BranchGoddard Space Flight Center 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. Science Computing BranchGoddard Space Flight Center Background NASA’s Earth Science Technology Office proposed the creation of an Earth 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. Science Computing BranchGoddard Space Flight Center 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 ReuseInteroperabilityEase of AdoptionPerformance 15 applications use ESMF component coupling services and 3+ utilities 8 new applications comprised of never-before coupled components 2 codes adopt ESMF with < 2% lines of code changed, or within 120 FTE-hours No more than 10% overhead in time to solution, no degradation in scaling ESMF Project Description

10. Science Computing BranchGoddard Space Flight Center 1.ESMF provides an environment for assembling geophysical components into applications. 2.ESMF provides a toolkit that components use to i.increase interoperability ii.improve performance portability iii.abstract common services 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. Architecture Low Level Utilities Fields and Grids Layer Model Layer Components Layer: Gridded Components Coupler Components ESMF Infrastructure User Code ESMF Superstructure BLAS, MPI, NetCDF, … External Libraries

11. Science Computing BranchGoddard Space Flight Center May 2002Draft Developer’s Guide and Requirements Document completed 1 st Community Requirements Meeting and review held in D.C. July 2002ESMF VAlidation (EVA) suite assembled August 2002Architecture Document: major classes and their relationships Implementation Report: language strategy and programming model Software Build and Test Plan: sequencing and validation May 2003ESMF Version 1.0 release, 2 nd Community Meeting at GFDL November 2003First 3 interoperability experiments completed April 2004Second API and production software release, 3 rd Community Meeting November 2004All interoperability experiments complete; all testbed applications compliant January 2005Final delivery of source code and documentation Time Line

12. Science Computing BranchGoddard Space Flight Center 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.