Computer workstation having demand-paged virtual memory and enha

Details Computer workstation having demand-paged virtual memory and enha Computer workstation having demand-paged virtual memory and enha

1993-12-29

1997-02-25

Chan, Eddie P.

395464, 395463, 39549702, G06F 1208

Patent

active

056066856

ABSTRACT:
A CTOS network comprised of a plurality of workstations provides for virtual demand paging transparently across the network in a manner which permits a large virtual memory to efficiently be provided for each of a plurality of concurrently running applications on a CTOS workstation. Each application running on the workstation is provided with assigned pages and a local clock which operates based on the well known clock algorithm. A unique combination of local policy and global policy is used for page replacement which results in significantly more efficient management of available memory pages. The global policy includes an "elbow room" enhancement which permits the global page replacement policy to better take into account the individual activity of the concurrently running applications. In addition, enhanced prefaulting and page cleaning are provided, whereby it is made significantly more likely that a running application will find a requested page in its local clock.

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Exploring CTOS, by E. I. Miller, et al., Prentice Hall, Englewood Cliffs, New Jersey, 1991.
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