This second volume continues to document international high performance computing ecosystems, including the sponsors and sites that host them. Each chapter is punctuated with a site's flagship system and discusses program background and motivation; presents highlights of applications, workloads, and benchmarks; describes hardware architectures, system software, and programming systems; explores storage, visualization, and analytics; examines the data center/facility as well as system statistics; and contains pictures of buildings and systems in production, floorplans, and many block diagrams and charts to illustrate system design and performance.