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Author Alijani, G. S. ♦ Kang, G. ♦ Wedde, H. F. ♦ Brown, W. G. ♦ Chen, S.
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Abstract We analyze current and future needs in building adaptive real-time systems, and then formulate a series of design requirements for their hardware/interconnection, operating system, and application levels from which we derive a plea for a layered and integrated system design. We report on the novel distributed operating system DRAGON SLAYER which provides highly reliable and adaptive kernel services for real-time applications. It supports the novel file system MELODY which, in order to both meet real-time constraints and provide for high availability in a hazardous environment, allows for replicating, relocating, or deleting of file copies. Such copies may also assume a different status regarding the recency, reliability, and consistency of their information: They may be public or private. Status changes as well as file replication, deletion, or relocation are analyzed and managed by local file assigners, based on cost and time delay criteria and - for public copies - on cooperation with all file assigners responsible for the other public copies of a given file. A distributed implementation of our integrated system design model is currently being completed in our labs in order to serve as a distributed real-time testbed. For systems modeled according to our design requirements all relevant parameters could be checked and fine-tuned according to the environmental situation for the tested system.- We also report on a sensitivity study that shows how promptly the MELODY file system reacts to changing environmental situations (changing request patterns). Our findings are discussed, future work is outlined.
Description Affiliation: Computer Science Department, Wayne State University, Detroit, MI (Wedde, H. F.; Brown, W. G.; Chen, S.; Kang, G.) || Computer Science Department, University of Wyoming, Laramie, WY (Alijani, G. S.)
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1975-04-01
Publisher Place New York
Journal ACM SIGOPS Operating Systems Review (OPSR)
Volume Number 23
Issue Number 3
Page Count 15
Starting Page 126
Ending Page 140


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Source: ACM Digital Library