## Parallelizing Elimination Orders with Linear Fill (1997)

Citations: | 2 - 0 self |

### BibTeX

@MISC{Bornstein97parallelizingelimination,

author = {Claudson Bornstein and Bruce Maggs and Gary Miller and R. Ravi},

title = {Parallelizing Elimination Orders with Linear Fill},

year = {1997}

}

### OpenURL

### Abstract

This paper presents an algorithm for finding parallel elimination orders for Gaussian elimination. Viewing a system of equations as a graph, the algorithm can be applied directly to interval graphs and chordal graphs. For general graphs, the algorithm can be used to parallelize the order produced by some other heuristic such as minimum degree. In this case, the algorithm is applied to the chordal completion that the heuristic generates from the input graph. In general, the input to the algorithm is a chordal graph G with n nodes and m edges. The algorithm produces an order with height at most O(log 3 n) times optimal, fill at most O(m), and work at most O(W (G)), where W (G) is the minimum possible work over all elimination orders for G. Experimental results show that when applied after some other heuristic, the increase in work and fill is usually small. In some instances the algorithm obtains an order that is actually better, in terms of work and fill, than the original on...