An Implementation of Distributed Shared Memory in Wide Area Network and Its Performance Evaluation

摘要

A distributed shared memory (DSM) has been used mainly in small-scale distributed systems as a way of inter-process communications. Furthermore, it has been used as a repository for shared data in distributed parallel processing on computer clusters. In addition to these applications, in this paper, it is confirmed that DSM can be effectively used as foundation of data sharing in a wide-area network based on the Internet. For that purpose, we have implemented a new memory consistency protocol called Cluster-based Release Consistency (CRC) on Lernuria a platform of distributed parallel proceesing which has been now develop- ing. CRC can be applied to layered computer clusters and can make it possible to practically use DSM in wide-area distributed environments. In this paper, the functions and processing schemes in Lemuria for the wide area distributed environments are described. Furthermore, the performance evaluation in the Internet is presented. As a result of evaluation, Lemuria has been able to run at higher speed several times as much as other DSM systems.