To build an exascale system, Stevens said scientists are working toward a "co-design" where everything needed to make such a system possible -- application software and programming models, improvements in optics and memory, and other attributes -- are being done in tandem with hardware development.
But for now, the race is on. China has the world's second-most-powerful supercomputer on the planet, the Nebulae, a 1.27 petaflop system, found the most recent Top 500 ranking. The top system is Cray's 1.76-petaflop Jaguar supercomputer at the U.S. Department of Energy's Oak Ridge National Laboratory
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