The success of high performance multiple processor systems depends upon the ability to decompose a program into small segments suitable for execution on one processor. It is argued that purely applicative languages ar...
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The success of high performance multiple processor systems depends upon the ability to decompose a program into small segments suitable for execution on one processor. It is argued that purely applicative languages are better suited for parallel processing because they offer considerable advantage over Fortran-like languages in program transformation and decomposition. A scheme for decomposing applicative programs is described through examples.
This paper discusses the benefits that can be obtained by the use of a relatively small desk top computer with a storage media for the preparation of the APT source program for subsequent processing with a post proces...
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This paper discusses the benefits that can be obtained by the use of a relatively small desk top computer with a storage media for the preparation of the APT source program for subsequent processing with a post processor on a large mainframe time share system.
When thinking of sorting data, one generally focuses first on data processing. But sorting also finds many applications in engineering, especially in systems programs. This article discusses several algorithms that il...
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When thinking of sorting data, one generally focuses first on data processing. But sorting also finds many applications in engineering, especially in systems programs. This article discusses several algorithms that illustrate the sorting process and improve its efficiency. A look at the three basic types of sorting algorithms - exchange, insertion and selection - helps clarify the process of organizing information.
The interface between the host computer and an intelligent graphics terminal and the optimization of functional responsibilities of each become increasingly important in a time-sharing computer-aided design environmen...
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The interface between the host computer and an intelligent graphics terminal and the optimization of functional responsibilities of each become increasingly important in a time-sharing computer-aided design environment. This paper describes the implementation of the ACM/SIGGRAPA Core System on a DEC GT42 (W/PDP 11/10) and the CDC Cyber 74 as host computer.
This paper deals with the statistics of estimating the software reliability of complex real-time systems where an electronic digital computer and associated computer programs are essential elements of system design an...
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This paper deals with the statistics of estimating the software reliability of complex real-time systems where an electronic digital computer and associated computer programs are essential elements of system design and function. Testing is conducted in the operating environment or a simulated environment related to the operating environment in some known way. The procedure is Bayesian so that improvement of reliability estimation is realized in a formal and convenient way as more and more test data are accumulated.
In order to take full advantage of the capabilities of very large computers, it is important that data structure and coding practices be carefully selected to efficiently use the special hardware features. The data st...
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In order to take full advantage of the capabilities of very large computers, it is important that data structure and coding practices be carefully selected to efficiently use the special hardware features. The data structure must be designed to stage information from the high speed, relatively small devices, to the lower speed, relatively large capacity devices. Coding practices must consider instruction stacks, cache memories, and main memory structure, in order to drive the arithmetic units at maximum speed. For virtual memory machines, the real memory must be used in such a manner as to prevent thrashing. Large machines may provide for scalar processing in parallel with vector processing, and the arithmetic units may utilize either parallel or pipeline processing.
The paper studies the problems of definition, modification and control of input-output systems (including automatic emergency takeover). The organization and the control of distributed input-output systems are present...
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The paper studies the problems of definition, modification and control of input-output systems (including automatic emergency takeover). The organization and the control of distributed input-output systems are presented followed by the aspect of language definition.
A report is presented on the development and testing of a sampling technique designed to extract accurate measurements of reference string characteristics while recording only a part of the complete reference string. ...
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A report is presented on the development and testing of a sampling technique designed to extract accurate measurements of reference string characteristics while recording only a part of the complete reference string. The cost of the measurements is controlled by the sampling rate. Results are based on experiments using synthetic reference strings from an LRU generative model. 12 refs.
A description is given of the KRTM kernel which has been designed in order to facilitiate real-time multiprogramming during the development of TELEX-M, a dedicated operating system for telex exchanges. KRTM creates a ...
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A description is given of the KRTM kernel which has been designed in order to facilitiate real-time multiprogramming during the development of TELEX-M, a dedicated operating system for telex exchanges. KRTM creates a run-time environment supporting execution of all the operating system programs. Although the KRTM characteristics have been derived from the very concrete real life program (to design and implement a reliable operating system capable to provide a satisfactory service for 512 telex abonents and trunks to other switching systems), the resulting product seems to be more general, covering a wider class of strongly multiprogramed, real-time minicomputersystems with high reliability and modularity requirements. The KRTM itself has been designed with the requirement for modifiability in mind, and therefore it is easy to obtain new versions of the kernel, adapted to a particular application.
Data organization in major-minor loop magnetic bubble memory is described, including an analysis of sequential and random accessing. A typical sorting application is described and analyzed, including information on op...
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Data organization in major-minor loop magnetic bubble memory is described, including an analysis of sequential and random accessing. A typical sorting application is described and analyzed, including information on optimal algorithms, buffering criteria, and run time. Deviations from this example are presented and analyzed, including highly parallel systems, highly independent systems, and a range of floating buffering schemes.
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