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Dryad is a general-purpose distributed execution engine for coarse-grain data-parallel applications. A Dryad application combines computational "Vertices" with communication "Channels" to form a dataflow graph. Dryad runs the application by executing the vertices of this graph on a set of available computers, communicating as appropriate through files, TCP pipes, and shared-memory FIFOs. The vertices provided by the application developer are quite simple and are usually written as sequential programs with no thread creation or locking. Concurrency arises from Dryad scheduling vertices to run simultaneously on multiple computers, or on multiple CPU cores within a computer. The application can discover the size and placement of data at run time, and modify the graph as the computation progresses to make efficient use of the available resources.

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Format:PDFSize:508 KB
Date:Mar 2007
Pages:14

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