Collaborative Research: Framework: Software: NSCI: Enzo for the Exascale Era (Enzo-E)

This project is concerned with getting our adaptive mesh refinement (AMR) astrophysics and cosmology application to run efficiently on upcoming Exascale platforms. Our approach has been to develop Enzo-E, the "Extreme" scalable version of our mature ENZO structured-AMR MPI code. Two key features of Enzo-E are 1) it is built on a re-designed scalable "array-of-octree" AMR framework, Cello; and 2) it is parallelized using Charm++ rather than MPI. Charm++'s asynchronous and data-driven task-based parallel programming approach explicitly targets Exascale application development, and is well-suited for the irregular and dynamic data structures inherent in AMR applications. Weak scaling of Enzo-E is excellent, with demonstrated scaling on some of the largest NSF systems available, including Blue Waters at NCSA and Frontera at TACC. Recent accomplishments include additional                 
physics capabilities, scalable I/O, Version 1.0 release, and the first science publication citing results obtained from Enzo-E simulations.