Pub Date : 1993-10-14DOI: 10.1109/WWOS.1993.348175
Bill N. Schilit, N. Adams, R. Gold, M. M. Tso, R. Want
The PARCTAB is a personal digital assistant (PDA) that communicates via infrared (IR) datapackets to a network of IR transceivers. The infrared network is designed for in-building use, where each room becomes a communication cell. In contrast to the approach used by other PDAs, most PARCTAB applications run on remote hosts and therefore depend on reliable communication through the IR network. The infrastructure provides reliability as well as uninterrupted service when a PARCTAB moves from cell to cell. The PARCTAB and a supporting infrastructure has been operational since March 1993 at the Computer Science Lab at Xerox PARC. The system currently comprises thirty cells and twenty-five PARCTABs and will expand in the near future. There are three types of software components in the PARCTAB system: gateways, agents, and applications. Gateways implement a datagram service for sending and receiving packets using IR signals. Each tab is represented by an agent. An agent tracks the location of its tab and provides location independent reliable remote procedure calls. The protocols enforce security, preventing, for example, an unauthorized application from taking control of a tab.<>
{"title":"The PARCTAB mobile computing system","authors":"Bill N. Schilit, N. Adams, R. Gold, M. M. Tso, R. Want","doi":"10.1109/WWOS.1993.348175","DOIUrl":"https://doi.org/10.1109/WWOS.1993.348175","url":null,"abstract":"The PARCTAB is a personal digital assistant (PDA) that communicates via infrared (IR) datapackets to a network of IR transceivers. The infrared network is designed for in-building use, where each room becomes a communication cell. In contrast to the approach used by other PDAs, most PARCTAB applications run on remote hosts and therefore depend on reliable communication through the IR network. The infrastructure provides reliability as well as uninterrupted service when a PARCTAB moves from cell to cell. The PARCTAB and a supporting infrastructure has been operational since March 1993 at the Computer Science Lab at Xerox PARC. The system currently comprises thirty cells and twenty-five PARCTABs and will expand in the near future. There are three types of software components in the PARCTAB system: gateways, agents, and applications. Gateways implement a datagram service for sending and receiving packets using IR signals. Each tab is represented by an agent. An agent tracks the location of its tab and provides location independent reliable remote procedure calls. The protocols enforce security, preventing, for example, an unauthorized application from taking control of a tab.<<ETX>>","PeriodicalId":345070,"journal":{"name":"Proceedings of IEEE 4th Workshop on Workstation Operating Systems. WWOS-III","volume":"31 16","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114111858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1993-10-14DOI: 10.1109/WWOS.1993.348179
A. Banerji, D. Cohn, D. Kulkarni
Highly portable, powerful computers with wireless connections will radically change the way people think about and use computing. No longer will users limit their computations to a single machine; rather, they will use the machines that best suit their current needs. A user's environment, which we call the computing persona, cannot continue to be redefined on each machine. Rather, as people move between systems, their environment should follow. The notion of computing persona provides new insight into resource management in a distributed and dynamic world. Resource constraints will vary widely and for-fee services will change optimization strategies. Many of the technologies needed to realize personae are current research topics, and the persona concept will focus that work and make it more valuable.<>
{"title":"Mobile computing personae","authors":"A. Banerji, D. Cohn, D. Kulkarni","doi":"10.1109/WWOS.1993.348179","DOIUrl":"https://doi.org/10.1109/WWOS.1993.348179","url":null,"abstract":"Highly portable, powerful computers with wireless connections will radically change the way people think about and use computing. No longer will users limit their computations to a single machine; rather, they will use the machines that best suit their current needs. A user's environment, which we call the computing persona, cannot continue to be redefined on each machine. Rather, as people move between systems, their environment should follow. The notion of computing persona provides new insight into resource management in a distributed and dynamic world. Resource constraints will vary widely and for-fee services will change optimization strategies. Many of the technologies needed to realize personae are current research topics, and the persona concept will focus that work and make it more valuable.<<ETX>>","PeriodicalId":345070,"journal":{"name":"Proceedings of IEEE 4th Workshop on Workstation Operating Systems. WWOS-III","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126064732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1993-08-01DOI: 10.1109/WWOS.1993.348152
J. B. Chen
This paper discusses the use of software methods to collect system trace for DEC Ultrix and 3.0 Mach on a DECstation 5000/200. We assert that software methods are a valuable tool for collecting system trace and understanding operating system and memory system behavior for modern workstation workloads. Software methods have some well documented shortcomings. We discuss how their impact was minimized in our system. We further support the validity of the software approach by comparing behavior predicted by our tracing/simulation system to measurements made with less intrusive methods.<>
{"title":"Software methods for system address tracing","authors":"J. B. Chen","doi":"10.1109/WWOS.1993.348152","DOIUrl":"https://doi.org/10.1109/WWOS.1993.348152","url":null,"abstract":"This paper discusses the use of software methods to collect system trace for DEC Ultrix and 3.0 Mach on a DECstation 5000/200. We assert that software methods are a valuable tool for collecting system trace and understanding operating system and memory system behavior for modern workstation workloads. Software methods have some well documented shortcomings. We discuss how their impact was minimized in our system. We further support the validity of the software approach by comparing behavior predicted by our tracing/simulation system to measurements made with less intrusive methods.<<ETX>>","PeriodicalId":345070,"journal":{"name":"Proceedings of IEEE 4th Workshop on Workstation Operating Systems. WWOS-III","volume":"20 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132285725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/WWOS.1993.348169
Randolph Y. Wang, T. Anderson
The current generation of file systems are inadequate in facing the new technological challenges of wide area networks and massive storage. xFS is a prototype file system we are developing to explore the issues brought about by these technological advances. xFS adapts many of the techniques used in the field of high performance multiprocessor design. It organizes hosts into a hierarchical structure so locality within clusters of workstations can be better exploited. By using an invalidation-based write back cache coherence protocol, xFS minimizes network usage. It exploits the file system naming structure to reduce cache coherence state. xFS also integrates different storage technologies in a uniform manner. Due to its intelligent use of local hosts and local storage, we expect xFS to achieve better performance and availability than current generation network file systems run in the wide area.<>
{"title":"xFS: a wide area mass storage file system","authors":"Randolph Y. Wang, T. Anderson","doi":"10.1109/WWOS.1993.348169","DOIUrl":"https://doi.org/10.1109/WWOS.1993.348169","url":null,"abstract":"The current generation of file systems are inadequate in facing the new technological challenges of wide area networks and massive storage. xFS is a prototype file system we are developing to explore the issues brought about by these technological advances. xFS adapts many of the techniques used in the field of high performance multiprocessor design. It organizes hosts into a hierarchical structure so locality within clusters of workstations can be better exploited. By using an invalidation-based write back cache coherence protocol, xFS minimizes network usage. It exploits the file system naming structure to reduce cache coherence state. xFS also integrates different storage technologies in a uniform manner. Due to its intelligent use of local hosts and local storage, we expect xFS to achieve better performance and availability than current generation network file systems run in the wide area.<<ETX>>","PeriodicalId":345070,"journal":{"name":"Proceedings of IEEE 4th Workshop on Workstation Operating Systems. WWOS-III","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130369703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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