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Wavefront Diffusion and LMSR: Algorithms for Dynamic Repartitioning of Adaptive Meshes

By Kirk Schloegel, George Karypis and Vipin Kumar


Existing state-of-the-art schemes for dynamic repartitioning of adaptive meshes can be classi#ed as either di#usion-based schemes or scratch-remap schemes. We present a new scratch-remap scheme called Locally-Matched Multilevel Scratch-Remap #or simply LMSR#. The LMSR scheme tries to compute a partitioning that has a high overlap with the existing partitioning. We show that LMSR decreases the amountofvertex migration required to balance the graph compared to current scratch-remap schemes, particularly for slightly imbalanced graphs. We describe a new di#usion-based scheme that we refer to as Wavefront Di#usion. In Wavefront Di#usion, the #ow of vertices moves in a wavefront from overweight to underweight domains. We show that Wavefront Di#usion obtains signi#cantly lower vertex migration requirements while maintaining similar or better edge-cut results compared to existing di#usion algorithms, especially for highly imbalanced graphs. Furthermore, we compare Wavefront Di#usion ..

Topics: Dynamic Graph Partitioning, Multilevel Di usion, Scratch-Remap, Wavefront Di usion, LMSR, Adaptive Mesh Computations
Year: 1998
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