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This work presents a scalability analysis of embarrassingly parallel applications running on cluster and multi-cluster machines. Several applications can be included in this category. Examples are Bag-of-tasks (BoT) applications and some classes of online web services, such as index processing in online web search. The analysis presented here is divided in two parts: first, the impact of front end topology on scalability is assessed through a lower bound analysis. In a second step several task mapping strategies are compared from the scalability standpoint.