First presenter			Co-presenter(s)
Name :	Sardar Haque *		Name:	Shahadat Hossain
E-mail:			E-mail:
Affiliation:	Middlesex College		Name:	Marc Moreno Maza *
Department:	Department of Computer Science		E-mail:
City:			Name:
State/Province:	Ontario		E-mail:
Country:	Canada		Name:
Talk Number:	11-09		E-mail:
Session:	11- High-Performance Computer Algebra		Schedule:   Room:	Sunday, 12:00   B-2620
Related website:
Title of presentation:	A Note on the Performance of Sparse Matrix-vector Multiplication with Column Reordering
Abstract:
We revisit ordering techniques as a preprocessing step for improving the performance of sparse matrix-vector multiplication (SpMxV) on modern hierarchical memory computers. In computing SpMxV the main purpose of ordering of columns (or rows) is to improve the performance by enhancing data reuse. We present a new ordering technique based on the binary reflected gray codes and experimentally evaluate and compare it with other column ordering techniques from the literature. The results from numerical experiments with very large test matrices clearly demonstrates the performance gains rendered by our proposed technique.