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IBM Systems Journal

Issue 4 • Date 1978

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Displaying Results 1 - 10 of 10
  • Preface

    Page(s): 322 - 323
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (745 KB)  

    Today's computer environment is characterized by increased computer capacity and capability, by computing options ranging from total centralization to complete decentralization, and by advances in complex applications. This environment challenges the data processor to effectively and fully utilize available computing power. There is a need to study and plan data processing activity, considering such topics as performance tuning, capacity planning, distributed processing, and programming productivity. The papers in this issue explore some of these topics. View full abstract»

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  • National Westminster Bank mass storage archiving

    Page(s): 344 - 358
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1464 KB)  

    The application went on line in June 1977 and handled the full inquiry load a few weeks later. Performance was analyzed after six months to determine the system's effect on users. Response time was found to be better than expected, with many inquiries being processed in less than five minutes, as the mean record retrieval rate usually was below 1000 records per hour. The fast response apparently was due to two factors: there was a noticeable reduction in hard-copy requests, which often had been made as backup for on-line requests, and MSS availability was better than expected. A certain amount of redundancy had been allowed for in the MSS configuration but was rarely needed. Data availability also proved to be excellent, with no cases of unreadable records and only one or two cases of mechanical damage to cartridges. It is not yet known what the inquiry rate will be for data more than three years old. That rate will determine the residual work load of the microfilm bureau. However, the primary objectives of the application-substantial cost savings and improved service to customers-have been amply fulfilled. View full abstract»

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  • The development of software systems to aid in physical planning

    Page(s): 359 - 382
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1948 KB)  

    This paper has discussed the development of a geographic physical planning system and its evaluation by users in two modes of application-one that emphasizes problem analysis and solution and one that emphasizes querying a practical data base. Results have been sufficiently encouraging that the experimental system has formed the basis of an operational system product. The initial results have also been sufficiently successful that further research is being pursued toward the addition of improved graphic presentations, city planning models, and statistical capabilities. Basic research and operational systems are being studied elsewhere in the world with good results. Each system, including the Urban Management System presented in this paper, adds to the general fund of knowledge from which all can draw. Each system also aims toward meeting the special needs of the home region in which it was developed. View full abstract»

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  • Data Stream Linkage Mechanism

    Page(s): 383 - 408
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2037 KB)  

    DSLM, as exemplified by the AMPS prototype, has measurably enhanced programmer productivity and program maintainability in everyday application programming by replacing the conventional programming technique with the more natural process of plugging together data-driven functional modules. View full abstract»

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  • Performance investigations with a DOS/VS-based operating system model

    Page(s): 409 - 443
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2139 KB)  

    In this paper the development of, DDS/ VS-based operating system model that serves as a basis for performance predictions hoc been demonstrated. The model has been developed o a level that is neither too gross nor too detailed with respect to the desired performance results. Nevertheless, it reflects those hardware and software components that may have a significant influence on system performance. View full abstract»

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  • A performance model of MVS

    Page(s): 444 - 462
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1784 KB)  

    In this paper we have presented a case study of the development of a performance model for the IBM OS/VS2 MVS operating system. The purpose of the case study is to demonstrate applications of modeling techniques to real-world problems such as capacity planning and system tuning. The model is also to be used as a research vehicle for studying advanced architectural enhancements. Although further tests are being conducted with actual workloads, the initial validation results have been encouraging. View full abstract»

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  • Authors

    Page(s): 463 - 464
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    Freely Available from IEEE
  • Abstracts

    Page(s): 465 - 466
    Save to Project icon | PDF file iconPDF (982 KB)  
    Freely Available from IEEE
  • Books

    Page(s): 467 - 469
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    Freely Available from IEEE
  • Volume 17, 1978

    Page(s): 470
    Save to Project icon | PDF file iconPDF (832 KB)  
    Freely Available from IEEE

Aims & Scope

Throughout its history, the IBM Systems Journal has been devoted to software, software systems, and services, focusing on concepts, architectures, and the uses of software.

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Meet Our Editors

Editor-in-Chief
John J. Ritsko
IBM T. J. Watson Research Center5