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Tutte seminar - Andreas FeldmannExport this event to calendar

Friday, September 14, 2012 — 3:30 PM to 4:30 PM EDT

Obtaining Balanced Partitions of Grids using Trees

Speaker: Levent Tunçel
Affiliation: University of Waterloo
Room: Mathematics & Computer Building (MC) 5158

Abstract:

We consider the k-balanced partitioning problem, which is defined as follows. Find the minimum number of edges in a graph that, when cut, partition the vertices into k (almost) equally sized sets. Amongst others, the problem derives its importance from the need to distribute data within a parallel computing architecture. In this setting we are particularly interested in 2D finite element model (FEM) simulations. We therefore model the input as a regular quadrilateral tiling of the plane. More precisely, we focus on solid grid graphs. These are finite connected subgraphs of the infinite 2D grid without holes. 
Trees often help to find solutions to the problem on grid graphs. This is surprising since trees and grids are very different from a combinatorial point of view. We show that algorithms for trees help to divise algorithms for grids, both in the special case when k=2 (the bisection problem) and when k can take arbitrary values. Additionally we prove that the k-BALANCED PARTITIONING problem experiences similar hardness on grids and trees.

Location 
MC - Mathematics & Computer Building
5158
200 University Avenue West

Waterloo, ON N2L 3G1
Canada

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