HPS IMPLEMENTATION OF VAX; INITIAL DESIGN AND ANALYSIS.

HPS (High Performance Substrate) is a new microarchitecture targeted for implementing high performance computing engines. Like the other aspects of Aquarius, it attempts to achieve high performance, in part, by exploiting concurrency. The HPS execution model is a restriction on fine granularity data flow. This paper reports on the first experiment using HPS, a preliminary design and simulation of the VAX architecture. We briefly describe the execution model of HPS and the rationale for using it to implement the VAX. We then discuss in detail our design approach with respect to a number of the fundamental aspects of a VAX implementation. Finally, we present some encouraging preliminary measurements of a partial simulation of the VAX architecture.