We present an open-source code, Xyst, intended for the simulation of complex-geometry
3D compressible flows. The software implementation facilitates the effective use of
the largest distributed-memory machines, combining data-, and task-parallelism on
top of the Charm++ runtime system. Charm++’s execution model is asynchronous by default,
allowing arbitrary overlap of computation and communication. Built-in automatic load
balancing enables redistribution of arbitrarily heterogeneous computational load based
on real-time CPU load measurement at negligible cost. The runtime system also features
automatic checkpointing, fault tolerance, resilience against hardware failure, and
supports power- and energy-aware computation. We verify and validate the numerical
method and demonstrate the benefits of automatic load balancing for irregular workloads.
