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The Computer Journal 1976 19(3):216-224; doi:10.1093/comjnl/19.3.216
© 1976 by British Computer Society
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An adaptive on line data compression system

D. L. Dance1 * and U. W. Pooch2 §

1 University of Arkansas, Little Rock, USA, 2 College of Engineering, Texas A. & M. University, College Station, Texas, USA

A set of programs is described defining an interface between an online information system and the input/output control system of the computer system. These programs are grouped by the function they perform: buffering, item relocation, compression, and dynamic priority assignment. The interface is adaptive in nature by physically reorganising the data set based on usage statistics. Items are physically assigned to priority areas to reduce system I/O. The result of the reorganisation is to construct working set data sets, a subset of the original data set, having a substantial portion of all data set activity. This working set data set is maintained in core via buffering, thereby reducing I/O overhead. To implement the interface and reduce the cost of storing data sets, one of the many available compression routines was applied to the entire data base.

Received March 1975.

* University of Arkansas, Little Rock.

§ College of Engineering, Texas A. & M. University, College Station, Texas 77843, USA.


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