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Designing a cluster for geophysical fluid dynamics applications. Göran Broström Dep. of Oceanography, Earth Science Centre, Göteborg University. Our cluster (me and Johan Nilsson, Dep. of Meterology, Stockholm University). Grant from the Knut & Alice Wallenberg foundation (1.4 MSEK)
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Designing a cluster for geophysical fluid dynamics applications Göran Broström Dep. of Oceanography, Earth Science Centre, Göteborg University.
Our cluster(me and Johan Nilsson, Dep. of Meterology, Stockholm University) • Grant from the Knut & Alice Wallenberg foundation (1.4 MSEK) • 48 cpu cluster • Intel P4 2.26 Ghz • 500 Mb 800Mhz Rdram • SCI cards • Delivered by South Pole • Run by NSC (thanks Niclas & Peter)
Geophysical fluid dynamics • Oceanography • Meteorology • Climate dynamics
Large variety of scales Parameterizations are important in geophysical fluid dynamics
Timescales • Atmospheric low pressures: 10 days • Seasonal/annual cycles: 0.1-1 years • Ocean eddies: 0.1-1 year • El Nino: 2-5 years. • North Atlantic Oscillation: 5-50 years. • Turnovertime of atmophere: 10 years. • Anthropogenic forced climate change: 100 years. • Turnover time of the ocean: 4.000 years. • Glacial-interglacial timescales: 10.000-200.000 years.
Timescales • Atmospheric low pressures: 10 days • Seasonal/annual cycles: 0.1-1 years • Ocean eddies: 0.1-1 year • El Nino: 2-5 years. • North Atlantic Oscillation: 5-50 years. • Turnovertime of atmophere: 10 years. • Anthropogenic forced climate change: 100 years. • Turnover time of the ocean: 4.000 years. • Glacial-interglacial timescales: 10.000-200.000 years.
Timescales • Atmospheric low pressures: 10 days • Seasonal/annual cycles: 0.1-1 years • Ocean eddies: 0.1-1 year • El Nino: 2-5 years. • North Atlantic Oscillation: 5-50 years. • Turnovertime of atmophere: 10 years. • Anthropogenic forced climate change: 100 years. • Turnover time of the ocean: 4.000 years. • Glacial-interglacial timescales: 10.000-200.000 years.
Positive NAO phase Negative NAO phase
Positive NAO phase Negative NAO phase
Timescales • Atmospheric low pressures: 10 days • Seasonal/annual cycles: 0.1-1 years • Ocean eddies: 0.1-1 year • El Nino: 2-5 years. • North Atlantic Oscillation: 5-50 years. • Turnovertime of atmophere: 10 years. • Anthropogenic forced climate change: 100 years. • Turnover time of the ocean: 4.000 years. • Glacial-interglacial timescales: 10.000-200.000 years.
Timescales • Atmospheric low pressures: 10 days • Seasonal/annual cycles: 0.1-1 years • Ocean eddies: 0.1-1 year • El Nino: 2-5 years. • North Atlantic Oscillation: 5-50 years. • Turnovertime of atmophere: 10 years. • Anthropogenic forced climate change: 100 years. • Turnover time of the ocean: 4.000 years. • Glacial-interglacial timescales: 10.000-200.000 years.
MIT General circulation model • General fluid dynamics solver • Atmospheric and ocean physics • Sophisticated mixing schemes • Biogeochemical modules • Efficient solvers • Sophisticated coordinate system • Automatic adjoint schemes • Data assimilation routines • Finite difference scheme • F77 code • Portable
MIT General circulation model Spherical coordinates “Cubed sphere”
MIT General circulation model • General fluid dynamics solver • Atmospheric and ocean physics • Sophisticated mixing schemes • Biogeochemical modules • Efficient solvers • Sophisticated coordinate system • Automatic adjoint schemes • Data assimilation routines • Finite difference scheme • F77 code • Portable
Some tests in INGVAR (32 AMD 900 Mhz cluster)
Choosing interconnection (requires a cluster to test) Based on earlier experience we use SCI from Dolphinics (SCALI)
Our choice • Named Otto • SCI cards • P4 2.26 GHz (single cpus) • 800 Mhz Rdram (500 Mb) • Intel motherboards (the only available) • 48 nodes • NSC (nicely in the shadow of Monolith)