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OverView : Generic Visualization of Large-Scale Distributed Systems

Visualization aids developers in conceptual understanding, testing, and debugging of distributed systems. Many of these systems, due to their complexity, are programmed using high-level abstractions (such as actors, ambients, processes, or virtual machines); and while tools are lacking for such visualization in general, there is a specific need for visualization of very large distributed systems, including thousands or tens of thousands of these entities. OverView is an entity-specification driven software toolkit which allows visualization of these systems; preserving the high-level concepts within and displaying their important properties, such as location, remote communication, and migration, both online (that is, in realtime) and offline. OverView’s architecture is generic, in that different abstractions may reuse the same visualization modules, requiring only a change in the entity-specifications that map high-level code to the visualization abstractions. 1 Problem Description Distributed systems (for example, a computer program that is distributed across a network) have recently become very popular, due to their versatility and the relatively low expense of increased computation power through networking. However, these systems are extremely complex, and thus the burden on programmers and researchers to develop these systems has increased. For example, one might wish to see the activity, computationally speaking, of the computers comprising SETI@home[1]. Perhaps one wants to view the interactions between the computers running a highperformance simulation across several computational clusters. You might also want to see, visually, a BitTorrent swarm as its activity spikes and dwindles over time. More intriguing is the idea of a distributed program running on mobile phones, the runtime of which may migrate from the phone to nearby servers and back again as the owner of the phone walks around a city, or if the battery becomes critically low. Developers and maintainers of such systems can gain a productivity boost if they can have a means of visually analyzing these systems; furthermore, such a tool can be used as an aid to teach students concepts of distributed systems. Therefore, the creation of a tool to visualize distributed systems is a useful and worthwhile endeavor to undertake. 1.1 Specific Problems in Distributed Systems Visualization It is worth describing some of the specific problems inherent in visualizing distributed systems, and they At a given time, there are one hundred thousand personal computers working on a computation. http://setiathome.berkeley.edu/