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DOE OSTI · 1048292

Data-Parallel Mesh Connected Components Labeling and Analysis

Harrison, Cyrus·Childs, Hank·Gaither, Kelly
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Abstract

We present a data-parallel algorithm for identifying and labeling the connected sub-meshes within a domain-decomposed 3D mesh. The identification task is challenging in a distributed-memory parallel setting because connectivity is transitive and the cells composing each sub-mesh may span many or all processors. Our algorithm employs a multi-stage application of the Union-find algorithm and a spatial partitioning scheme to efficiently merge information across processors and produce a global labeling of connected sub-meshes. Marking each vertex with its corresponding sub-mesh label allows us to isolate mesh features based on topology, enabling new analysis capabilities. We briefly discuss two specific applications of the algorithm and present results from a weak scaling study. We demonstrate the algorithm at concurrency levels up to 2197 cores and analyze meshes containing up to 68 billion cells.

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97 MATHEMATICS AND COMPUTING99 GENERAL AND MISCELLANEOUSALGORITHMSPARALLEL PROCESSINGTOPOLOGY

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Harrison, Cyrus, Childs, Hank, Gaither, Kelly. 2011-04-10. Data-Parallel Mesh Connected Components Labeling and Analysis. https://www.osti.gov/biblio/1048292

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