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Poster: FLAMBES: evolving fast performance models

by: Adam Crume, Carlos Maltzahn, Jason Cope, Sam Lang, Rob Ross, Phil Carns, Chris Carothers, Ning Liu, Curtis Janssen, John Bent, Stephan Eidenbenz, Meghan McClelland
In Proceedings of the 2011 companion on High Performance Computing Networking, Storage and Analysis Companion (2011), pp. 31-32, doi:10.1145/2148600.2148617  Key: citeulike:11563285

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Abstract

Large clusters and supercomputers are simulated to aid in design. Many devices, such as hard drives, are slow to simulate. Our approach is to use a genetic algorithm to fit parameters for an analytical model of a device. Fitting focuses on aggregate accuracy rather than request-level accuracy since individual request times are irrelevant in large simulations. The model is fitted to traces from a physical device or a known device-accurate model. This is done once, offline, before running the simulation. Execution of the model is fast, since it only requires a modest amount of floating point math and no event queueing. Only a few floating point numbers are needed for state. Compared to an event-driven model, this trades a little accuracy for a large gain in performance.


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