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Analysis of Delay-Bandwidth Normalization Characteristic in Decay Usage Algorithm of UNIX  

Park, Kyeong-Ho (서울대학교 컴퓨터공학부)
Hwang, Ho-Young (한성대학교 멀티미디어공학부)
Lee, Chang-Gun (서울대학교 컴퓨터공학부)
Min, Sang-Lyul (서울대학교 컴퓨터공학부)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.34, no.10, 2007 , pp. 511-520 More about this Journal
Abstract
Decay usage scheduling algorithm gives preference to processes that have consumed little CPU in the recent past. It has been widely-used in time-sharing systems such as UNIX, where CPU-intensive processes and interactive processes are mixed. However, there has been no sound understanding about the mixed effects of decay usage parameters on the service performance. This paper empirically analyzes their effects in terms of the resulting service bandwidth and delay Based on such empirical analysis, we derive the clear meaning of each parameter. Such analysis and understanding provides a basis of controlling decay usage parameters for desirable service provision as required by applications.
Keywords
decay usage; CPU scheduler; fair scheduling; delay-bandwidth normalization; history-sensitiveness;
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