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Local Decisions and Triggering Mechanisms for Adaptive Fault Tolerance



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Local Decisions and Triggering Mechanisms for Adaptive Fault Tolerance Phillip Stanley Marbell Diana Marculescu Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA 15213 3890 pstanley dianam ece cmu edu Abstract Dynamic fault tolerance management DFTM was previously introduced as a means of providing environmentand workload driven adaptation for failure prone battery powered systems This paper introduces and analyzes the role of local decision policies in a DFTM environment and presents a precise formulation for when it is beneficial to activate a given DFTM algorithm with respect to metrics that combine performance reliability power consumption and battery life In particular local decision algorithms are described in the context of an imaging array application running on a network of resource constrained processing elements It is demonstrated that DFTM algorithms in conjunction with appropriately chosen activation times increase the mean computation before battery failure for a single battery by a factor between 1 1 to 5 8 for the application investigated 1 Introduction Failure in its many forms is becoming an increasingly important design constraint in computing systems Unlike traditional fault tolerant computing systems where failure is the exceptional case that must be addressed with appropriate preventive and recovery techniques technology trends are making it increasingly difficult to guarantee device operability with the result that larger fractions of manufactured devices must be declared defective when they fail testing These factors make it increasingly important to include reliability as a design constraint in much the same manner as power consumption has in recent years gained importance as a critical constraint alongside performance By including failure as a design constraint and characterizing systems in terms of a combination of performance reliability power consumption and where appropriate battery life it will



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