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In this paper, the authors describe their vision for Hobbes, an Operating System and Runtime (OS/R) framework for extreme-scale systems. The Hobbes design explicitly supports application composition, which is emerging as a key approach for applications to address scalability and power concerns anticipated with coming extreme-scale architectures. They make use of virtualization technologies to provide the flexibility to support requirements of application components for different node-level operating systems and runtimes, as well as different mappings of the components onto the hardware. They describe the architecture of the Hobbes OS/R, how they will address the cross-cutting concerns of power/energy, scheduling of massive levels of parallelism, and resilience.
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