Designing Self-adaptive Multimedia Applications Through Hierarchical Reconfiguration

Layaida, Oussama; Hagimont, Daniel

doi:10.1007/11498094_9

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…However, it has been reserved in the past to specific types of systems, where adaptations are well-known and can be characterized in advance. For example, service adaptation has been used in the context of multimedia streaming servers, where increasing compression will save network bandwidth at the expense of content quality [2]. Another example resides in the context of security systems, where simpler encryption algorithms might require less processing while being less secure [9].…”

Section: Service-level Adaptationmentioning

confidence: 99%

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Self-adapting Service Level in Java Enterprise Edition

et al. 2009

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Abstract. Application servers are subject to varying workloads, which suggests an autonomic management to maintain optimal performance. We propose to integrate in the component-based programming model often used in current application servers the concept of service level adaptation, allowing some components to dynamically degrade or upgrade their level of service. Our goal is to be able, under heavy workloads, to trade a lower service level of the most resource-intensive components for a stable performance of the server as a whole. Upgrading or degrading components is autonomously performed through runtime profiling, which is used to estimate the application's hot spots and target adaptations. In addition to finding the best adaptations, this performance profile allows our system to characterize the effects of past adaptations; in particular given the current workload, it is possible to estimate if a service level upgrade might result in an overload. As a result, by stabilizing the server at peak performance via component adaptations, we are able to drastically improve both overall latency and throughput. For instance, on both the RUBiS 1 and TPC-W benchmarks 2 , we are able to maintain peak performance in heavy load scenarios, far exceeding the initial capacity of the system.

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Section: Service-level Adaptationmentioning

confidence: 99%

“…A common example of such adaptations can be found in the context of multimedia streaming servers, where the resolution and encoding of the content can be adapted to control the demand in CPU and network bandwidth [2]. Limiting the size and precision of search results is also a well-known and efficient adaptation of Internet applications.…”

Section: Introductionmentioning

confidence: 99%

Self-adapting Service Level in Java Enterprise Edition

et al. 2009

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“…2.B.3-1 future execution of condition forecasting at design time embedding adaptation decisions in the system code [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Self-adaptive component-based interoperability framework for real-time systems

Colonese

Loubach

Cunha

2007

2007 IEEE/AIAA 26th Digital Avionics Systems Conference

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Component-based software engineering offers a way to break complex systems into well-defined parts. Self-adaptive mechanisms are crucial to enable run-time reconfiguration and increase parts reuse in other computer systems and environments. These systems must satisfy functional and nonfunctional requirements. Despite efficient data integration being a common aspiration, the practicality of achieving interoperability remains a challenge for quickly transforming functional processes. For other components work together with the existing ones, and for the new system components development to operate seamlessly with and among other systems, while maintaining proprietary information integrity, the adoption of a common set of "building codes" is required. This paper proposes a self-adaptive framework for a real-time system through a scope analysis of stakeholders' requirement. It implements generic behavioral models for Systems Servers and Invokers. Changes on a statechart dimension while adapting a system to the framework lead software engineers to a nearly transparent integration process. Platform dependencies are also captured separately, enabling code-generation subsystem to reuse same components across a wide range of heterogeneous platforms and real-time systems. The framework can lead software components to high degrees of cost-effective reuse and it is tested in a real-time system prototype developed in the Brazilian Aeronautical Institute of Technology (Instituto Tecnológico de Aeronáutica -ITA). The proposed framework focused on self-adaptive services components at run-time and on an efficient interoperability approach. At the end, functional requirements and the software architectural structure are enforced such that the end-to-end timing behavior of the resulting system and its specifications can be verified.

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“…Implementing component-based adaptive applications is a very active and consolidated research/industrial issue [3,4]. Nevertheless, there has been little work on adaptability of middleware services, such as persistence, replication, transaction, or communication [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Towards Context-Aware Transaction Services

Rouvoy¹,

Serrano-Alvarado²,

Merle³

2006

Distributed Applications and Interoperable Systems

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Abstract. For years, transactional protocols have been defined for particular application needs. Traditionally, when implementing a transaction service, a protocol is chosen and remains the same during the system execution. Nevertheless, the dynamic nature of nowadays application contexts (e.g., mobile, ad-hoc, peer-to-peer) and context variations (semantics-related aspects) motivates the need for transaction service adaptation. Next generation of transaction services should be adaptive or even better self-adaptive. This paper proposes CATE: (1) a componentbased architecture of standard 2PC-based protocols and (2) a ContextAware Transaction sErvice. Self-adaptation of CATE is obtained by context awareness and component-based reconfiguration. This allows CATE to select the most appropriate protocol with respect to the execution context. We show that using CATE performs better than using only one commit protocol in a variable system and that the reconfiguration cost is negligible.

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Designing Self-adaptive Multimedia Applications Through Hierarchical Reconfiguration

Cited by 11 publications

References 15 publications

Self-adapting Service Level in Java Enterprise Edition

Self-adapting Service Level in Java Enterprise Edition

Self-adaptive component-based interoperability framework for real-time systems

Towards Context-Aware Transaction Services

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