Research on scalability of parallel computing system

Scalability has become an important concept in parallel computer system and parallel algorithms.The characteristics of four existing scalability metrics are analysed for parallel computing system,i.e.,the iso-efficiency metrics,iso-speed metrics,average latency metrics and iso-ratio-of-parallel calculation-overhead metrics.A new scalability metric which reflects the scalability of parallel computer system more directly and precisely is proposed.This paper presents some experiments.The results show that this metric can estimate preferably the scalability of parallel computing systems.