ISSN:0038-0644    

DOI:10.1002/spe.4380050102

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractThis paper describes a skeletal operating system which provides the services and structure necessary to implement real‐time applications. Features which would require a specific configuration or a non‐minimal computer are either omitted or optional. In particular, although some protocol is established, no peripheral devices are required. System features include dynamic storage allocation, memory protection, multiprogramming, pseudo‐clocks, and co‐ordination and communication primitives. Due to its simple design, the system ‘kernel’ has proven to be remarkably

ISSN:0038-0644    

DOI:10.1002/spe.4380050103

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractWe are accustomed to thinking that the requirements of different users of FORTRAN (or any other language for that matter) are so varied that they can only be met by a series of compliers: a standard one, an optimizing one, an in‐core batching one and so on. This paper describes a complier which, although its main aim was to process batches of small student jobs, was desinged to compete with all the manufacturer's compliers on their chosen groun

ISSN:0038-0644    

DOI:10.1002/spe.4380050104

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractThis paper describes the mechanism used to schedule jobs and control machine use on the IBM 370/165 at Cambridge University, England. The same algorithm is currently being used in part at the University of Bradford, and implementations are in progress at the Universities of Leeds, Salford and Liverpool for the ICL 1900 series machines. The mechanism relies on allocating a share of the machine to each user (or project), and then varying the turnround time for jobs according to whether the project in question is over‐ or under‐using its share of the machine. The approach is believed to be an original one, having a number of advantages over more conventional scheduling and control algorit

ISSN:0038-0644    

DOI:10.1002/spe.4380050105

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractA brief account of certain extensions to the basic definition of semaphores is given. An implementation of semaphores as controllers of buffer queues is described and it is shown how this was used to solve an actual synchronization problem.

ISSN:0038-0644    

DOI:10.1002/spe.4380050106

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractWith some types of floating‐point hardware, the central processor is free to perform other tasks while a floating‐point operation completes. The FORTRAN complier for the SEL‐840MP computer was modified to execute subscripting calculations in parallel with floating‐point operations where possible. This is done by operating on the triad table for an expression before scanning it to generate code. Skip pointers are inserted into the table to change the order in which entries are pr

ISSN:0038-0644    

DOI:10.1002/spe.4380050107

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractA high‐level language approach has been used to define a powerful, flexible and machine‐independent control language, in which many of the desirable facilities that are available in modern programming languages have been included. This paper describes the language and its application to the problems of job control, and suggests its further use in a multi‐machine enviro

ISSN:0038-0644    

DOI:10.1002/spe.4380050108

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractAs applications systems grow in complexity, the optimization of their resource usage becomes more important. This holds true not only as an attempt to increase their own effectiveness, but also to reduce the impact of that system on resources shared by other users in the environment. The analysis and optimization of user systems can be simplified considerably by identifying commonly required evaluation facilities and implementing these facilities in a system‐independent manner.This paper examines existing techniques and describes a system, the SSD evaluation system, designed and implemented by the authors on an IBM System/370 for the purpose of monitoring the performance of applications system

ISSN:0038-0644    

DOI:10.1002/spe.4380050109

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractIn programming systems based on abstract machine modelling concepts, the underlying structure of the abstract machine can be made available to the software implemented on it. The result is an unusual facility for diagnosis and exploration of software structure. Such a facility has been added to the macro implemention of SNOBOL4. This paper describes the nature of the facility, illustrates its use, and presents some results of using it for language implementation and development.

ISSN:0038-0644    

DOI:10.1002/spe.4380050110

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractIt is shown that it is possible to gather run‐time statistics from a program without either slowing it down too much, or changing things such as the hardware or the operating‐system ker

ISSN:0038-0644    

DOI:10.1002/spe.4380050111

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY