The 5th International Workshop on

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Presentation outline
1 PRISM General Presentation 2 - PRISM
Goals 3 - PRISM Scientific and Technical
Standards 4 - PRISM Coupling and I/O System 5 -
PRISM first coupler Oasis 3.0
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1 PRISM General Presentation

• PRISM PRogram for Integrated Earth System
  Modelling
• A European project, started December 2001,
• funded by the European Commission (4.8 M)
• Coordinators
• Guy Brasseur (MPI, Hamburg)
• Gerbrand Komen (KNMI, Amsterdam)
• PRISM Director Reinhard Budich (MPI)

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1 PRISM General Presentation
gt 22 partners leading climate research
institutes and computer vendors

• MPG-IMET, Germany
• KNMI, Netherlands
• MPI-MAD,
• Met-Office, UK
• UREADMY, UK
• IPSL, France
• Météo-France, France
• CERFACS, France
• DMI, Denmark
• SHMI, Sweden

• NERSC, Norway
• ETH Zurich, Switzerland
• ING, Italy
• MPI-BGC, Germany
• PIK, Germany
• ECMWF, Europe
• UCL-ASTR, Belgium
• NEC Europe
• FECIT/Fujitsu
• SGI Europe
• SUN Europe

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2 - PRISM Goals

• Help climate modellers spend more time on
  science
• Provide software infrastructure
• to easily assemble Earth system coupled models
  based on existing state-of-art European
  components models
• launch/monitor complex/ensembles Earth system
  simulations
• Define and promote technical and scientific
  standards for Earth System modelling
• Undertake a pilot infrastructure project toward,
  on the longer term, the establishment of a
  European Climate and Earth System Modeling
  Supercomputer Facility.

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2 - PRISM Goals
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3 - PRISM scientific and technical standards

• Scientific standards
• Physical interfaces
• Global Earth System parameters
• Technical standards
• Architecture and User Interface
• Coupler and I/O
• Data and grid format
• Coding and quality

Interaction with other groups (ESMF, ESG/NOMADS,
CF...)
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4- PRISM Coupling and I/O System
Keynotes - PSMILe Driver - Transformer

• PRISM Coupling and I/O System
• Model Interface Library (PSMILe) Driver
  Transformer
• Programming language Fortran 90 and C
• All sofware produced are open source
• Coupling and I/O system use freely available open
  source software products external libraries,
  hidden from the model developer (MPICH, LAM-MPI,
  NetCDF, libXML, mpp_io, SCRIP, )
• Vendors may provide optimized versions for
  specific independent software components (e.g.
  MPI, NetCDF)

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4 - PRISM Coupling and I/O System
Keynotes - PSMILe Driver - Transformer

• Insures data coupling exchanges between any two
  component models either directly or via or the
  transformer including repartitioning with MPI1 or
  MPI2
• Insures data input/output from/to files
• gtSwitch between coupling exchanges
• and input/output is
• indicated by the user in a coupling
  configuration file (XML)
• transparent for the component model
• managed automatically by the PSMILe

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4 - PRISM Coupling and I/O System
Keynotes - PSMILe Driver - Transformer

• Concise and extendable interface
• Coupling data produced by a source model can be
  consumed by more than one target model and at a
  different frequency.
• Coupling data may be only partially consumed by
  the target model (extraction of subspaces,
  hyper-slabs or indexed grid points).
• Local operation on the coupling data can
  performed before exchange.

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4 - PRISM Coupling and I/O System
Keynotes - PSMILe Driver - Transformer

• Different classes of primitives insuring
• The Startup phase
• Initialization prism_init(),
• Termination of definition prism_enddef()
• The Definition phase
• Definition of Grid prism_def_grid(),
  prism_set_mask(),
• Definition of Data prism_def_var()
• The Transfer of fields
• Exchange or I/O of Data prism_put(),
  prism_get()
• The Termination phase
• Termination of PRISM application
  prism_terminate()

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4 - PRISM Coupling and I/O System
Keynotes - PSMILe Driver - Transformer

• Launching of component models
• - static all at beginning of simulation (MPMD or
  SPMD)
• Distribution of global information
• - initial date, calendar, coupling parameters,
  etc.
• Component model monitoring
• - centralises all logging messages sent by the
  models during the simulation (timestep, restart
  saved, etc.)

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4 - PRISM Coupling and I/O System
Keynotes - PSMILe Driver - Transformer

• Different transformations
• Spatial interpolation nearest-neighbour,
  bilinear, bicubic, conservative remapping,
• Other spatial transformations flux correction,
  merging, etc.
• General algebraic operations
• Combination of coupling data produced by one
  model may have to be combined before the
  exchange.
• On different types of fields
• 1D, 2D, 3D, 4D, scalar or vector, static or
  dynamic structure
• On different types of grids
• regular, gaussian, stretched, reduced,
  unstructured, etc.

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5 - PRISM First Coupler Oasis 3.0

• gt Available for beta testers
• New PRISM System model interface (PSMILe V.0)
• Using MPI1 or MPI2 and Conforming with final
  PRISM coupler interface.
• Direct communication between models with same
  grid and partitioning
• Modularity prism_put and prism_get may be
  called at each model
• time step exchange is performed or not by
  PSMILe, depending on
• users specifications in namcouple.
• Automatic time integration by PSMILe depending
  on users specification
• I/O and combined I/O and coupling
  functionalities
• New interpolations / interfacing with SCRIP
  library
• 1st and 2nd order conservative remapping for all
  grids
• Bilinear and bicubic interpolation for
  logically-rectangular grids
• Bilinear and bicubic interpolation for reduced
  atmospheric grids
• F90 rewriting (dynamic memory allocation)
• NetCDF format for grid and restart auxiliary
  files

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Contact us http//www.enes.org Sophie.valcke_at_cer
facs.fr Damien.Declat_at_cerfacs.fr Rene.Redler_at_ccrl-
nece.de Latour_at_fujitsu.fr Reiner_at_munich.sgi.com Sc
hoenemey_at_compuserve.de