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Scalability models are powerful analytical tools for evaluating and predicting the performance of parallel applications. Unfortunately, existing scalability models do not quantify failure impact and therefore cannot accurately account for application performance in the presence of failures. In this study, we extend two well-known models, namely Amdahl's law and Gustafson's law, by considering the impact of failures and the effect of fault tolerance techniques on applications. The deriveddoi:10.1109/clustr.2009.5289177 dblp:conf/cluster/ZhengL09 fatcat:7cyv7iybknappksyjb5vu3cyuy