Abstract
This article assess the state-of-the-art technology in massively parallel processors (MPPs) and clusters of workstations (COWs) for scalable parallel computing. We evaluate the IBM SP2, the Intel Paragon, the Cray T3D/T3E, and the ASCI TeraFLOPS system recently proposed by Intel. The concept of scalability is characterized from several orthogonal dimensions. Scalable performance attributes are discussed in the context of a newly proposed parallel computer model.