The Outer Rim Simulation: A Path to Many-Core Supercomputers
  We describe the Outer Rim cosmological simulation, one of the largest
high-resolution N-body simulations performed to date, aimed at promoting
science to be carried out with large-scale structure surveys. The simulation
covers a volume of (4.225Gpc)^3 and evolves more than one trillion particles.
It was executed on Mira, a BlueGene/Q system at the Argonne Leadership
Computing Facility. We discuss some of the computational challenges posed by a
system like Mira, a many-core supercomputer, and how the simulation code, HACC,
has been designed to overcome these challenges. We have carried out a large
range of analyses on the simulation data and we report on the results as well
as the data products that have been generated. The full data set generated by
the simulation totals more than 5PB of data, making data curation and data
handling a large challenge in of itself. The simulation results have been used
to generate synthetic catalogs for large-scale structure surveys, including
DESI and eBOSS, as well as CMB experiments. A detailed catalog for the LSST
DESC data challenges has been created as well. We publicly release some of the
Outer Rim halo catalogs, downsampled particle information, and lightcone data.
