2HOT: An improved parallel hashed oct-tree N-body algorithm for cosmological
Michael S. Warren · 2014
We report on improvements made over the past two decades to our adaptive treecode N-body method (HOT). A math- ematical and computational approach to the cosmological N-body problem is described, with performance and scalability mea- sured up to 256k (2 18 ) processors. We present error analysis and scientific application results from a series of more than ten 69 billion (4096 3 ) particle cosmological simulations, accounting for 4×10 20 floating point operations. These results include the first simulations using the new constraints on the standard model of cosmology from the Planck satellite. Our simulations set a new standard for accuracy and scientific throughput, while meeting or exceeding the computational efficiency of the latest generation of hybrid TreePM N-body methods.