We would like to thank Rand Hoven from Hewlett-Packard and Stephen Poole from The Performance Group for giving us access to the workstation clusters used in the experiments described. We would also like to thank Nenad Nedelkovic and Edmar Wienskoski who participated in an early version of this project.
This research was supported in part by NSF NYI Award CCR-9457770, NSF CISE postdoctoral fellowship Award CDA-9310073, NSF Grants CCR-9116343 and BIR-9408503, and by the Texas Advanced Technology Program under Grant 003604012.