This paper was originally published as a Technical Report (No. 184) for the CSIS (Computer Science and Information Systems) Department in 2002.

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In this paper, we propose an effective multiway hypergraph partitioning algorithm. We introduce the concept of net gain and embed itin the selection of cell moves. Unlike traditional FM-based iterative improvement algorithms in which the selection of the next cell to move is only based on its cell gain,our algorithm selects a cell based on both its cell gain and the sum of all net gains for those nets incidents to the cell. To escape from local optima and to search broader solution space, we propose a new perturbation mechanism. These two strategies significantly enhance the solution quality produced by our algorithm. Based on our experimental justification, we smoothly decrease the numbers of iteration from pass to pass to reduce the computational effort so that our algorithm can partition large benchmark circuits with reasonable run time. Compared with the recent multiway partitioning algorithms proposed by Dasdan and Aykanat [5], our algorithm significantly outperforms theirs in terms of solution quality (cutsize) and run time: the average improvements in terms of average cutsize over their PLM3 and PFM3 are 47.64% and 36.76% with only 37. 17% and 9.66% of their run time respectively.