Hierarchical data storage system

Details Hierarchical data storage system Hierarchical data storage system

1980-04-21

1982-03-30

Shaw, Gareth D.

Boots, shoes, and leggings

365230, G11C 906, G06F 1300

Patent

active

043228151

ABSTRACT:
A cache store is provided in conjunction with a main store. Each location of the cache has a changed bit. A list is maintained of the addresses of those locations in the cache store which have been modified. When the list becomes full, the entry at the head of the list is read out and the corresponding data item is transferred from the cache to the main store. Thus, there are never more than a limited number of items in the cache awaiting transfer. To clear the cache of all modified items, each entry in the list is read out in turn and the corresponding items are transferred to the main store. The system reduces the amount of traffic between the cache and the main store and hence improves efficiency.

REFERENCES:
patent: 3292152 (1966-12-01), Barton
patent: 3868644 (1975-02-01), Healey et al.
patent: 3878513 (1975-04-01), Werner
patent: 3986171 (1976-10-01), Spoelder
patent: 4195340 (1980-03-01), Joyce

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