VirtualClock: a new traffic control algorithm for packet-switched networks
ACM Transactions on Computer Systems (TOCS)
Fair scheduling in wireless packet networks
SIGCOMM '97 Proceedings of the ACM SIGCOMM '97 conference on Applications, technologies, architectures, and protocols for computer communication
Agile application-aware adaptation for mobility
Proceedings of the sixteenth ACM symposium on Operating systems principles
QoS-aware resource management for distributed multimedia applications
Journal of High Speed Networks - Special issue on multimedia networking
Active Management Framework for Distributed Multimedia Systems
Journal of Network and Systems Management
Distributed Performance Monitoring: Methods, Tools, and Applications
IEEE Transactions on Parallel and Distributed Systems
Autopilot: Adaptive Control of Distributed Applications
HPDC '98 Proceedings of the 7th IEEE International Symposium on High Performance Distributed Computing
Automatic Configuration and Run-time Adaptation of Distributed Applications
HPDC '00 Proceedings of the 9th IEEE International Symposium on High Performance Distributed Computing
End-Host Architecture for QoS-Adaptive Communication
RTAS '98 Proceedings of the Fourth IEEE Real-Time Technology and Applications Symposium
An Automated Profiling Subsystem for QoS-Aware Services
RTAS '00 Proceedings of the Sixth IEEE Real Time Technology and Applications Symposium (RTAS 2000)
A resource allocation model for QoS management
RTSS '97 Proceedings of the 18th IEEE Real-Time Systems Symposium
On adaptive resource allocation for complex real-time applications
RTSS '97 Proceedings of the 18th IEEE Real-Time Systems Symposium
Scheduling real-time applications in an open environment
RTSS '97 Proceedings of the 18th IEEE Real-Time Systems Symposium
A Dynamic Quality of Service Middleware Agent for Mediating Application Resource Usage
RTSS '98 Proceedings of the IEEE Real-Time Systems Symposium
HiFi: A New Monitoring Architecture for Distributed Systems Management
ICDCS '99 Proceedings of the 19th IEEE International Conference on Distributed Computing Systems
Exposing Application Alternatives
ICDCS '99 Proceedings of the 19th IEEE International Conference on Distributed Computing Systems
Using dynamic configuration to manage a scalable multimedia distribution system
Computer Communications
A control-based middleware framework for quality-of-service adaptations
IEEE Journal on Selected Areas in Communications
Enabling Multimedia QoS Control with Black-Box Modelling
Soft-Ware 2002 Proceedings of the First International Conference on Computing in an Imperfect World
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In order to achieve the best application-level Quality-of-Service (QoS), multimedia applications need to be dynamically tuned and reconfigured to adapt to fluctuating computing and communication environments. QoS-sensitive adaptations are critical when applications run in general-purpose systems, with no mechanisms provided for supporting resource reservations and real-time guarantees. Such adaptations are triggered by resource availability variations caused by best-effort resource allocations in unpredictable open environments. In this paper, we argue that adaptations are most effective to achieve a better QoS when performed within applications, where they may be optimized towards the best performance tradeoffs across various application parameters with different semantics. However, we believe that decisions about when and how adaptations should occur need to be coordinated, and formalized as a generic algorithm to be applied to a wide range of applications. For this purpose, we first identify an application model to focus on a set of application-specific tuning ‘knobs’ and critical parameters, then propose a polynomial-complexity QoS probing algorithm to quantitatively capture the run-time relationships between the two sets of parameters. Finally, we present a hierarchical adaptive QoS control architecture to bridge the gap between original ‘triggers’ of adaptation and actual tuning ‘knobs’ to be invoked. To prove the validity of our architecture and algorithms, we present Agilos, a middleware implementation of our hierarchical architecture. Under its control, we show that a configurable multimedia tracking application is able to deliver optimal performance even when operating in unpredictable open environments.