MITgcm Releases

1
MITgcm Releases

• Sealion
• mid-May 2000
• Wrapper2
• November 2000
• Pelican
• mid-May 2001

http//www.mitgcm.org/sealion

• Release Attributes
• GPL ?
• 3 year life span
• maintenance patches
• frozen feature set
• frozen documentation

2
Behind the Scenes
Source Repository
checkpoint 1
sealion 1.0.0
checkpoint 2
sealion 1.0.1
To extract code specify codebase and
build codebase identifies revision of each source
file (both development checkpoints and
releases are revision controlled) build
identifies what files and structure to export

• Example
• codebasecheckpoint24 buildforward_ocean
• gets configuration that forms basis for most
  MITgcm ocean-only forward runs e.g. 1/6 Atlantic,
  Global 4

3
Sealion Features
Beta mid-April 2000 Final mid-May 2000

• Checkpoint 24
• Packaged Source Repository
• Intermediate Atmosphere
• Adjoint sensitivity
• Component Model Communication and Coordination
  Library
• Block solver
• Algorithm and code documentation
• To do
• Kalman filter/sequential estimation compatible?
• High-resolution Atlantic test-case?
• MITgcm Sealion ECCO build! (see later )
• Conspicuously absent
• Optimized wrapper (see Wrapper2)
• Bulk formula (volunteer?)
• Tutorial Guide

4
Wrapper2
Beta mid-October 2000 Final mid-Nov 2000

• Checkpoint24 Wrapper
• General tile connectivity.
• Flexible tile size.
• System V IPC mapping, Myrinet MCP mapping, IBM SP
  LAPI mapping, Digital Memory Channel mapping.
• Stand alone library test codes.
• Enhanced documentation.
• Coupled modeling support features.
• Conspicuously absent
• SGI/T3E optimized mapping (volunteers?)

5
MITgcm Pelican Release

• Probable features
• Chemistry packages
• Coupled Experiments
• TEM parameterization
• Generalized horizontal coord, Cubed-sphere,
• Generalized vertical coord,
• Some high-end atmos. physics
• On-line tutorial
• Possible features
• Bottom boundary layer
• Additional advection schemes
• Biological schemes
• Beta mid-April 2001?

6
MITgcm Builds

• Concept
• Different builds for different groups
• Current builds
• forward_ocean
• 1/6 degree Atlantic ECCO model
• Paleo simulation Zhang model
• Geothermal Adcroft model
• Global 4 degree Buginon model
• Barotropic Spiegel model
• intermediate_atmosphere
• atmospheric Jamous model
• coupled Hill-Adcroft model
• ECCO build
• Eckert State Estimation Tool?
• ecco-0.8.8?
• JPL CVS tree?
• which do we target? Just one please!