Multi-GPU Simulations of the Infinite Universe

Abstract text:

Multi-GPU Simulations of the Infinite Universe

István Csabai1, 2

1 Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest, Hungary
2 Institute for Physics, Eötvös Loránd University, Budapest, Hungary 

The StePS (Stereographically Projected Cosmological Simulations) is a new zoom-in cosmological direct N-body simulation method, that can simulate an infinite universe with unprecedented dynamic range for a given amount of memory, and in contrast of the traditional periodic simulations, its fundamental geometry and topology match observations. We present the Multi-GPU realisation of this algorithm with MPI-OpenMP-CUDA hybrid parallelisation, and show what parallelisation efficiency can be reached with our implementation. With our code, it is possible to run simulations with few a Gpc diameter and with $10^9M_{\odot}$ mass resolution in the center under days on the MARCC (Maryland Advanced Research Computing Center) GPU cluster or run extremely fast simulations with a reasonable resolution for fitting the cosmological parameters. These simulations can be used for the prediction needs of large surveys such as DES (Dark Energy Survey), Euclid or WFIRST (Wide-Field Infrared Survey Telescope).

László Dobos

End of talk: 6/22/2018 4:40:00 PM

Start of talk: 6/22/2018 4:20:00 PM