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A page-swapping prototype for VM/HPO

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6 Author(s)
W. H. Tetzlaff ; IBM Research Division, Thomas J. Watson Research Center, P.O. Box 704, Yorktown Heights, New York 10598, USA ; T. Beretvas ; W. M. Buco ; J. Greenberg
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This paper discusses a series of changes that were made to a system running the Virtual Machine/System Product with the High Performance Option to enhance paging. The motivation and the background for these enhancements are discussed, and the design of a series of experimental paging subsystems is described and contrasted with the old design: specifically, the new algorithms for main memory management, block paging, working set identification, trimming, prepaging, page replacement, page-out device selection, and page-out slot selection. The performance impact of these changes is illustrated by results of benchmark measurements, which are then contrasted to measurements without the enhancements. Some things learned in running the prototype are discussed and conclusions drawn.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Systems Journal  (Volume:26 ,  Issue: 2 )