SHARER, a time sharing system for the CDC 6600

Harrison, Malcolm C.; Schwartz, J. T.

doi:10.1145/363717.363778

Cited by 10 publications

(2 citation statements)

References 7 publications

(5 reference statements)

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“…Ideas similar to those described here have been suggested by others (Harrison 1967;Huxtable 1967;Wichmann 1968). We have presented our system because we feel that, taken as a whole, it represents a systematic and practical approach to the design of replaceable operating systems.…”

Section: Resultssupporting

confidence: 91%

The nucleus of a multiprogramming system

Hansen¹

1970

Commun. ACM

260

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IntroductionThe multiprogramming system developed by Regnecentralen for the RC 4000 computer is a general tool for the design of operating systems. It allows the dynamic creation of a hierarchy of processes in which diverse strategies of program scheduling and resource allocation can be implemented.For the designer of advanced information systems, a vital requirement of any operating system is that it allow him to change the mode of operation it controls; otherwise his freedom of design can be seriously limited. Unfortunately, this is precisely what present operating systems do not allow. Most of them are based exclusively on a single mode of operation, such as batch processing, priority scheduling, real-time scheduling, or conversational access.When the need arises, the user often finds it hopeless to modify an operating system that has made rigid assumptions in its basic design about a specific mode of operation. The alternative-to replace the original operating system with a new one-is in most computers a serious, if not impossible, * P. Brinch Hansen, The nucleus of a multiprogramming system, Communications of the ACM 13, 4 (April 1970), 238-242.

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