Driving resource management with application-level quality of service specifications
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A soft real-time scheduling server on the Windows NT
WINSYM'98 Proceedings of the 2nd conference on USENIX Windows NT Symposium - Volume 2
Integrated global and local quality-of-service adaptation in distributed, heterogeneous systems
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The ability of operating system and network infrastructure to provide end-to-end quality of service (QoS) guarantees is a major acceptance factor for various distributed multimedia applications due to the temporal audio-visual and sensory information in these applications. Our constraints on the end-to-end QoS guarantees are: (1) QoS should be achieved on a general-purpose platform with a real-time extens ion support, and (2) QoS should be application-controllable. In order to achieve the users'' acceptance requirements and to satisfy our constraints on the multimedia systems, we need a QoS-aware resource management which supports QoS negotiation, admission, and reservation mechanisms in an integrated and accessible way. In this paper we present a new resource model and a time-variant QoS management which are the major components of the QoS-aware resource management. The resource model incorporates the resource scheduler, and a new component, resource broker, which provides negotiation, admission, and reservation capabilities for sharing resources such as CPU, network, or memory corresponding to requested QoS. The resource brokers are intermediary resource managers; when combined with the resources schedulers, they provide a more predictable and finer granularity control of resources to the application during the end-to-end multimedia communication than what is available in current general-purpose networked systems. This paper presents the QoS-aware resource management model as a loadable middleware, and discusses its verification through implementation, experiments and results.