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ESMF Design Overview and Implementation Strategy

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Title: ESMF Design Overview and Implementation Strategy


1
ESMF Design Overview andImplementation Strategy

MITgcm
NASA GSFC PSAS
NCEP Forecast
GFDL FMS Suite
Cecelia DeLuca / NCAR2nd ESMF Community
MeetingPrinceton, NJ
NSIPP Seasonal Forecast
NCAR/LANL CCSM
2
Outline
  • ESMF Design Goals
  • ESMF Design Strategies
  • Architecture and Features
  • Implementation Strategy

3
ESMF Design Goals
  • Composable, swappable, nestable model components
    for building Earth system applications

hurr_sim
ocean
assim_atm
assim
atm
dyn
phys
4
ESMF Design Goals (cont.)
  • Reusable toolkits for grid operations and routine
    utilities
  • Performance portability and ease of use in a
    complex, transient computing environment
  • Application and infrastructure codes that are
    maintainable and extensible

5
ESMF Design Goals (cont.)
  • Flexibility
  • To allow unconstrained scientific development
  • To encourage technical innovation
  • To support partial adoption of framework services
  • To accommodate different programming models

6
Outline
  • ESMF Design Goals
  • ESMF Design Strategies
  • Architecture and Features
  • Implementation Strategy

7
Architecture
Composable, swappable, nestable model components
for building Earth system applications Reusable
toolkits for grid operations and routine
utilities Performance portability and ease of
use in a complex, transient computing environment
Coupling Layer
ESMF Superstructure
Model Layer
User Code
Fields and Grids Layer
ESMF Infrastructure
Low Level Utilities
External Libraries
BLAS, MPI, NetCDF,
8
ESMF Design Approach
Application and infrastructure codes that are
maintainable and extensible
  • Component-based architecture large, functionally
    related pieces of software (e.g., atmosphere,
    land models) interact through well-defined
    interfaces
  • Object oriented design smaller, functionally
    related pieces of software are bundled into
    modules containing data and methods
  • Layered design details of platform and
    parallelism are not visible at the highest level
    interfaces

9
ESMF Design Approach (cont.)
  • Flexibility
  • To allow unconstrained scientific development
  • To encourage technical innovation
  • To support partial adoption of framework services
  • To accommodate different programming models
  • Physical interfaces to components are not
    prescribed
  • Designed to be compatible with user-managed
    intra-component communication
  • Extensible for new grids / algorithms / comm
    libraries
  • Many ESMF services may be used independently
  • Allows arbitrary placement of inter-component
    communication

10
Outline
  • ESMF Design Goals
  • ESMF Design Strategies
  • Architecture and Features
  • Implementation Strategy

11
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 sequential and concurrent modes
    of execution
  • 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

12
ESMF Services
components (gridded, coupler, app)states
Components / Coupling
field metadatafield and field bundle datafield
I/O
Fields
Fields and Grids
grid metadatagrid decomposition
Grids
transpose, halo, etc.abstract machine layout
Parallel Utilities
event alarmsperformance profilingI/O
primitivescommunication primitives, etc.
Low-Level Utilities
13
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
DELayout, PE List, Machine Model
14
ESMF Version 1.0
ApplicationComponent
GriddedComponent
CouplerComponent
Superstructure
State
Infrastructure
Bundle
Regrid
Field
Grid
PhysGrid
DistGrid
F90
Data
Communications
Layout
Array
Comm
Route
C
Design Complete Limited Prototype Fuller Prototype
MachineModel
Utilities TimeMgr, Config, LogErr, I/O etc.
15
Outline
  • ESMF Design Goals
  • ESMF Design Strategies
  • Architecture and Features
  • Implementation Strategy

16
Implementation Strategy for ESMF Version 1.0
  • Sufficient breadth to prototype how all major
    parts of the ESMF system will interact
  • Well-developed superstructure (Components and
    States)
  • Basic functions in most infrastructure classes

Superstructure
Infrastructure
17
Implementation Strategy for ESMF Version 1.0
(cont.)
  • Sufficient depth to develop simple ESMF
    applications
  • Groundwork laid for high performance
    communication, uniform API across
    shared/distributed memory, load balancing
    capability
  • Fully developed F90/C interoperability strategy

Superstructure
Infrastructure
18
Implementation Strategy for ESMF Version 1.0
(cont.)
  • Over the next year
  • Development of grid and parallel regrid services
  • Continued work on communication, decomposition,
    and other utilities
  • Organization, standardization, fine-tuning
    interfaces
  • Hardening and optimizing implementation
  • Extending and polishing documentation and
    tutorial examples

Superstructure
Infrastructure
19
Development Focus
  • Near-term framework development focus is on
    creating 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

20
The Team
  • Fields and Grids
  • Nancy Collins, Jon Wolfe, David Neckels
  • Regrid
  • Phil Jones
  • Time Machine Model/Comms
  • Earl Schwab
  • Benchmarks
  • Gerhard Theurich
  • Web and Admin
  • Robbie Stauffer
  • I/O
  • Nancy Collins, Atanas Trayanov
  • Profiling and logging
  • Shep Smithline, Erik Kluzek
  • Attributes
  • Leonid Zaslavsky, Nancy Collins
  • System Tests and Demos
  • Silverio Vasquez, Nancy Collins, Jon Wolfe
  • Build
  • Dennis Flanigan

21
More information
  • 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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