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SC Conference - Activity Details
Roadrunner: First to a Petaflop, First of a New BreedPrimary Session Leader:
Kenneth Koch (Los Alamos National Laboratory)
Secondary Session Leader:
Last May Roadrunner became the first supercomputer to exceed a sustained Petaflops. Achieving this performance at reasonable power and cost required a unique hybrid architecture utilizing Opteron and PowerXCell (Cell) processors. This hybrid architecture presents both unique opportunities and challenges to writing efficient code because of the internal Cell architecture and using Cells as accelerators to Opterons and not as additional compute nodes. This session will introduce attendees to the unique architecture of Roadrunner and the approaches and algorithmic issues for achieving high performance. A brief architecture talk will set the stage and then we'll focus on coding strategies and performance optimizations seen as generally applicable by a growing set of codes running on Roadrunner including two Gordon Bell finalists (VPIC & SPaSM), the TOP500 hybrid Linpack code, and some LANL Open Science Roadrunner efforts started last summer. We'll wrap up with audience discussion on implications for the future.