Adaptive Component Management in Bifrost
msra(2002)
摘要
This paper describes the adaptive component migration facility in the Bifrost LocationIndependent Computing System. Our design allows mobile clients to selectively invoke application component functionality locally or remotely in order to improve user response time. This decision is carried out dynamically by the Bifrost runtime system using a decisionmaking process that incorporates a variety of issues affecting the migration decision, including client and server resources, component size, the size of the data associated with the component, and network characteristics. We examine two options that extend the semantics of component invocation methods as provided by the underlying distributed systems technology (DCOM): Function call re-direction and API wrappers. We present the detailed design of this system, and report performance results. The adaptive functionality provided by Bifrost resulted in a minimum 29% reduction in response time for mobile client devices over a default DCOM-based implementation.
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