Providing soft real-time QoS guarantees for Java threads

Authors:
James C. Pang;Gholamali C. Shoja;Eric G. Manning
Affiliations:
Department of Computer Science, University of Victoria, Victoria, BC, Canada, V8W 3P6;Department of Computer Science, University of Victoria, Victoria, BC, Canada, V8W 3P6;Departments of Computer Science and Electrical & Computer Engineering
Venue:
Proceedings of the 2001 joint ACM-ISCOPE conference on Java Grande
Year:
2001

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Abstract

The Java platform has many characteristics that make it very desirable for integrated continuous media processing. Unfortunately, it lacks the necessary CPU resource management facility to support quality of service guarantees for soft real-time multimedia tasks. In this paper, we present our new Java Virtual Machine, Q-JVM, which brings CPU resource management to the Java platform. Q-JVM is based on Sun's JVM version 1.1.5. It implements an enhanced version or the MTR-LS algorithm in its thread scheduler. Combined with admission control that could be implemented in an application-level resource manager, it is able to support QoS parameters such as fairness, bandwidth partitioning and delay bound guarantees, as well as the cumulative service guarantee. Our test results show that Q-JVM is backward compatible with the standard JVM from Sun, has low scheduling overhead, and is able to provide QoS guarantees as specified.