Abstract. As overlays get deployed in large, heterogeneous systems-ofsystems with stringent performance constraints, their logical topology must exploit the locality present in the underlying physical network. In this paper, we propose a novel decentralized mechanism-Fluidify-for deploying an overlay network on top of a physical infrastructure while maximizing network locality. Fluidify uses a dual strategy that exploits both the logical links of an overlay and the physical topology of its underlying network. Simulation results show that in a network of 25,600 nodes, Fluidify is able to produce an overlay with links that are on average 94% shorter than that produced by a standard decentralized approach based on slicing, while demonstrating a sub-linear time complexity.
RésuméDistributed collaborative editors allow several remote users to contribute concurrently to the same document. Unfortunately, the currently deployed editors can only support a limited number of concurrent users. A number of peer-to-peer solutions have therefore been proposed to remove this limitation and allow a large number of users to work collaboratively. These approaches however tend to assume that all users edit the same set of documents, which is unlikely to be the case if such systems should become widely used and ubiquitous. In this paper we discuss a novel cohort-construction approach that allow users editing the same documents to rapidly find each other.
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