Distributed Memory Management: Design Issues and Future Trends

In: Computers and Technology

Submitted By ontim199312
Words 7654
Pages 31
Distributed Memory Management:
Design Issues and Future Trends
Ehab S. Al-Shaer
College of Computer Science
Northeastern University
Boston, MA 02115
March 19, 1993
ABSTRACT
In recent times the shared memory paradigm has received considerable attention in the realm of distributed systems. Distributed Shared Memory (DSM) is the abstraction for supporting the notion of shared memory in a physically non-shared (distributed) architecture. Issues to be addressed in the design and implementation of DSM include maintaining the consistency of the shared data across the network without incurring high overhead and integrating the DSM mechanisms with the local memory management.
The consistency model provided by a given DSM implementation attempts to balance performance and ease of programming: while DSM provides the abstraction of shared memory, it is not true shared memory - both from the point of view of the semantics and the cost of shared memory access.
The focus of this paper is to identify the issues involved in the design of DSM systems, briefly highlight the mechanisms in use by some current DSM implementations and propose some new DSM models for future distributed systems.
I INTRODUCTION
As computers become cheaper, there is increasing interest in using multiple CPUs to speed up individual applications. There are basically two design approaches to achieve this goal of high performance at low cost: multiprocessors and multicomputers.
Multiprocessors contain physical shared memory; Processors in a multiprocessor can easily communicate by reading and writing words in this memory. Multicomputers, on the other hand, do not contain physical shared memory; processors communicate by exchanging messages.
To combine the advantages of multiprocessors (easy to program) and multicomputers (easy to build), communication paradigms that simulate shared…...

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