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The Astrophysical MUltiscale Software Environment (AMUSE)

The Astrophysical MUltiscale Software Environment (AMUSE). P-I: Portegies Zwart Co-Is: Nelemans, Pols, O’Nuallain, Spaans Adv.: Langer, Tolstoy, Hut, Ercolano, de Grijs, Mellema, Spurzem, Bischof, Quillen. AMUSE. The objectives of AMUSE. More science with existing software

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The Astrophysical MUltiscale Software Environment (AMUSE)

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  1. The Astrophysical MUltiscale Software Environment (AMUSE) P-I: Portegies Zwart Co-Is: Nelemans, Pols, O’Nuallain, Spaans Adv.: Langer, Tolstoy, Hut, Ercolano, de Grijs, Mellema, Spurzem, Bischof, Quillen AMUSE

  2. The objectives of AMUSE • More science with existing software • Combine existing astrophysical codes • This is a technical problem • It is technically possible • Impression of how it works

  3. Existing codes • Excellent single-physics codes exist • hydro • gravity • radiation • stellar evolution • All written in different languages, different format, different architecture.... • Need a homogeneous environment for utilizing these resources

  4. More science with existing code • Universe is multi-physics ... • Scientific objectives: • dense stellar systems (hydro+gravity+stellar evo.) • evolution of galactic environments, star formation, AGN, ... (hydro+gravity+radiation) • planet formation (hydro+gravity+radiation) • galaxy formation and interaction (gravity+hydro+radiation+stellar evo.) • Single physics software solutions exist, try to combine existing codes

  5. This is a technical problem • No new physics needed • Combining requires understanding of how software and computer hardware interacts • Development to a usefull toolbox requires professional engineering • Requires substantial manpower

  6. It is technically feasible • Developing new code not optimal because • it is a time consuming task • large codes tend to become unmanageable • initial assumptions tend to require redesign at a late stage in the development process • Combining existing code via wrapper has been tried, and works • Propose homogeneous software framework, à la Numerical Recipes

  7. AMUSE Flow control layer (scripting language) Interface layer (scripting and high level languages) Gas dynamics Radiative transport Stellar evolution Stellar dynamics Henyey multi-shell stellar evolution 4th order Hermite block timestep N-body Smoothed particles hydrodynamics Metropolis Hastings Monte Carlo

  8. Limitations and Merits - Only problems whose physics are expressible through module coupling (different time scales) - Low and high level use possible - Radiative transfer (and stellar evolution) module links to VO (through eg. ‘spiegel’ and ‘partiview’): dust and stellar continuum, atomic and molecular lines; ELT, JWST, ALMA, Herschel

  9. Impression of how it works • install • suite of test applications • design your own multi-physics problem • write script • run • analyze data • download package from website • write Nature paper

  10. Design/Performance • AMUSE module must be written in language with Foreign Function Interface (C, C++, Fortran as well as high level languages like C#, Java, Haskell. Low level applications optimized. • Top level uses a scripting language. These are slow, but do just I/O, GUI, call sequence. • Top level can run in parallel (using MPI, GRID technology); data exchange through HDF • Low level can run in parallel or on dedicated hardware (eg GRAPE or GPU for direct N-body)

  11. Initial Applications • Young and dense star cluster • Evolution of gas and stars near a black hole in a galactic nucleus • Dynamics of embryonic planets in a debris disk

  12. Relation to other projects • Different concept but with similar scientific objectives/physics: • FLASH • Gadget • Starlab • Comparable in setup but with different scientific objectives: • Atmosphere/Ocean/Tectonic simulations by NASA • Molecular dynamics

  13. QUESTIONS?

  14. management/development plan • programmers under daily supervision of software engineer and PI • regular interaction with postdoc, who protects scientific objectives

  15. The cost • 6-year of programming effort (3x2years?) • 2 years of software engineering • 2 years of postdoc • travel, webservices, hardware, etc. • total cost: 640Keuro • NOVA request: 500kEuro

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