The working set model for program behavior

  • Authors:
  • Peter J. Denning

  • Affiliations:
  • -

  • Venue:
  • SOSP '67 Proceedings of the first ACM symposium on Operating System Principles
  • Year:
  • 1967

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Abstract

Probably the most basic reason behind the absence of a general treatment of resource allocation in modern computer systems is an adequate model for program behavior. In this paper a new model is developed, the “working set model”, which enables us to decide which information is in use by a running program and which is not. Such knowledge is vital for dynamic management of paged memories. The working set of pages associated with a process, defined to be the collection of its most recently used pages, is a useful allocation concept. A proposal for an easy-to-implement allocation policy is set forth; this policy is unique, inasmuch as it blends into one decision function the heretofore independent activities of process-scheduling and memory-management.