Abstract: "The personal sequential inference machines: PSI and PSI-II and its object-oriented logic programming and operating system, SIMPOS, have been developed as part of the fifth generation project at ICOT. At present, more than three hundred PSI machines and some other machines have been c...

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Bibliographische Detailangaben

1. Verfasser:	Yoshida, Kaoru (VerfasserIn)
Format:	Buch
Sprache:	English
Veröffentlicht:	Tokyo, Japan 1989
Schriftenreihe:	Shin-Sedai-Konpyūta-Gijutsu-Kaihatsu-Kikō <Tōkyō>: ICOT technical report 524
Schlagworte:	Datenverarbeitung Electronic data processing > Distributed processing Logic programming
Zusammenfassung:	Abstract: "The personal sequential inference machines: PSI and PSI-II and its object-oriented logic programming and operating system, SIMPOS, have been developed as part of the fifth generation project at ICOT. At present, more than three hundred PSI machines and some other machines have been connected to each other via LANs and WANs, and have been used not only for research and development but also for actual daily work. This paper describes the design and implementation of the SIMPOS distributed file system. It was first designed as a local file system; as the need to share resources over the network has arisen, it has gradually evolved into a distributed file system, through revisions and extensions. The goal of the distributed file system was to provide a network-transparent file access environment without loss of compatibility with the existing application software It has been achieved by adopting a dynamic-object-based model for concurrency-access control, a password/capability-based model for access control, and a remote access mechanism for communication control. The remote object access mechanism is the one to allow network-transparent method calls to objects. It has been found very beneficial for both system development and application development: the file system could be globalized with minimal development cost, and all the existing software was enabled to access remote files in exactly the same way as local ones, without any modification. The distributed file system has been in operation since summer 1987 and widely used in the ICOT research center and other research institutes; it has been made available for two different communication protocols: PSI-NET and TCP-IP in spring 1989. To our knowledge, this system would be the first distributed object oriented system running for practical use in this scale.
Beschreibung:	37 S.