This is a Barnes-Hut simulator written on top of Charm++. To build: 1. Edit the Makefile CHARM_PATH to point to your built copy of Charm++. 2. Edit the Makefile STRUCTURES_PATH to point to the Changa structures library. git clone https://github.com/N-BodyShop/utility STRUCTURES_PATH = utility/structures 3. make Usage: 1. Prepare a data file with 10K particles: ./plummer 10000 particles.bin 2. Run on a single processor with 100 TreePieces and 50 iterations ./charmrun +p1 ./barnes -in=particles.bin -p=100 -killat=50