DocumentCode :
2737552
Title :
A proposal for a DSM architecture suitable for a widely distributed environment and its evaluation
Author :
Oguchi, Masato ; Aida, Hitoshi ; Saito, Tadao
Author_Institution :
Fac. of Eng., Tokyo Univ., Japan
fYear :
1995
fDate :
2-4 Aug 1995
Firstpage :
32
Lastpage :
39
Abstract :
To realize functionally distributed computing in a wide area distributed environment, distributed shared memory (DSM) is an attractive option due to the simplicity and flexibility in software programming. DSM has mainly been studied in a local environment. In a widely distributed environment, the latency of communication impacts system performance, even if a high bandwidth network is used. DSM models in a widely distributed environment are discussed and evaluated in this paper. First, two existing DSM models are examined: shared virtual memory and replicated shared memory. Next, an innovative replicated shared memory model, which uses internal machine memory, is proposed. A prototype of this model using multi-thread programming was implemented on multi-CPU SPARCstations. These DSM models are compared with SCRAMNet, whose mechanism is based on replicated shared memory. Results from this evaluation show the superiority of the replicated shared memory compared to shared virtual memory when the length of the network is large. While replicated shared memory using external memory is influenced by the ratio of local and global accesses, replicated shared memory using internal machine memory is suitable for a wide variety of cases. The replicated shared memory model is considered to be suitable particularly for applications which impose real time operation in a widely distributed environment, since some latency hiding techniques such as context switching or data prefetching are not effective for real time demands
Keywords :
distributed memory systems; parallel architectures; performance evaluation; shared memory systems; SCRAMNet; SPARCstations; data prefetching; distributed shared memory architecture; functionally distributed computing; internal machine memory; latency hiding techniques; multi-thread programming; replicated shared memory; shared virtual memory; software programming; widely distributed environment; Bandwidth; Computer architecture; Context modeling; Delay; Distributed computing; Functional programming; Prefetching; Proposals; Prototypes; System performance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
High Performance Distributed Computing, 1995., Proceedings of the Fourth IEEE International Symposium on
Conference_Location :
Washington, DC
ISSN :
1082-8907
Print_ISBN :
0-8186-7088-6
Type :
conf
DOI :
10.1109/HPDC.1995.518692
Filename :
518692
Link To Document :
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