ON THE REAL POWER OF LOOSELY COUPLED PARALLEL ARCHITECTURES

Abstract

We propose new models of SIMD distributed memory parallel computers. We define concurrent read/write access also for machines other than PRAM. Our goal is to unify the description of abstract models of parallel machines with the aim of building a complexity theory where all models can be soundly compared. As an example, we introduce the Hypercube Random Access Machine with concurrent read/write capabilities, and show that it can solve some problems faster than the PRAM.