Live Webcast 15th Annual Charm++ Workshop

Cosmological simulators are currently an important compo- nent in the study of the formation of galaxies and planetary systems. However, existing simulators do not scale effectively on more recent ma- chines containing thousands of processors. In this paper, we introduce a new parallel simulator called ParallelGravity. This simulator is based on the Charm++ infrastructure, which provides a powerful runtime sys- tem that automatically maps computation to physical processors. Using Charm++ features, in particular its measurement-based load balancers, we were able to scale the gravitational force calculation of ParallelGravity on up to one thousand processors, with astronomical datasets containing millions of particles. As we pursue the completion of a production version of the code, our current experimental results show that ParallelGravity may become a powerful resource for the astronomy community.