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Conference of the Invisible Universe, Paris : France (2010)
Cosmological Simulations on a Grid of Computers
B. Depardon1, Eddy Caron1, Frédéric Desprez1, J. Blaizot2, H.M. Courtois3

The work presented in this paper aims at restricting the input parameter values of the semi-analytical model used in GALICS and MOMAF, so as to derive which parameters influence the most the results, e.g., star formation, feedback and halo recycling efficiencies, etc. Our approach is to proceed empirically: we run lots of simulations and derive the correct ranges of values. The computation time needed is so large, that we need to run on a grid of computers. Hence, we model GALICS and MOMAF execution time and output files size, and run the simulation using a grid middleware: DIET. All the complexity of accessing resources, scheduling simulations and managing data is harnessed by DIET and hidden behind a web portal accessible to the users.
1 :  INRIA Grenoble Rhône-Alpes / LIP Laboratoire de l'Informatique du Parallélisme - GRAAL
2 :  CRAL - Centre de Recherche Astrophysique de Lyon
3 :  IPNL - Institut de Physique Nucléaire de Lyon
Cosmologie Observationnelle
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Universe – cosmology – astronomical catalogues – data acquisition – Origin and formation of the Universe – Particle-theory and field-theory models of the early Universe – Astronomical catalogs – atlases – sky surveys – databases – retrieval systems – archives – etc. – Data acquisition: hardware and software