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Efficient and deterministic application deployment in component-based enterprise distributed real-time and embedded systems

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INFORMATION AND SOFTWARE TECHNOLOGY 2013年第2期55卷 475-488页

作者： Otte, William R. Gokhale, Aniruddha Schmidt, Douglas C. Vanderbilt Univ Inst Software Integrated Syst EECS Nashville TN 37212 USA

Context: Component-based middleware, such as the Lightweight CORBA Component Model, is increasingly used to implement enterprise distributed real-time and embedded (DRE) systems. In addition to supporting the quality-of-service (QoS) requirements of individual DRE systems, component technologies must also support bounded latencies when effecting deployment changes to DRE systems in response to changing environmental conditions and operational requirements. Objective: The goals of this paper are to (1) study sources of inefficiencies and non-deterministic performance in deployment capabilities for DRE systems and (2) devise solutions to overcome these performance problems. Method: The paper makes two contributions to the study of the deployment and configuration of distributed component based applications. First, we analyze how conventional implementations of the OMG's deployment and configuration (D&C) specification for component-based systems can significantly degrade deployment latencies. Second, we describe architectural changes and performance optimizations implemented within the Locality-Enhanced deployment and configuration Engine (LE-DAnCE) implementation of the D&C specification to obtain efficient and deterministic deployment latencies. Results: We analyze the performance of LE-DAnCE in the context of component deployments on 10 nodes for a representative DRE system consisting of 1000 components and in a cluster environment with up to 100 nodes. Our results show LE-DAnCE's optimizations provide a bounded deployment latency of less than 2 s for the 1000 component scenario with just a 4 percent jitter. Conclusion: The improvements contained in the LE-DAnCE infrastructure provide an efficient and scaleable standards-based deployment system for component-based enterprise DRE systems. In particular, deployment time parallelism can improve deployment latency significantly, both during pre-deployment analysis of the deployment plan and during the process of instal

关键词： Component-based real-time systems Deterministic deployment deployment and configuration Efficient deployment Parallel deployment deployment latency

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Applying Model Transformations to Optimizing Real-Time QoS configurations in DRE Systems

Applying Model Transformations to Optimizing Real-Time QoS C...

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5th International Conference on the Quality of Software Architectures

作者： Kavimandan, Amogh Gokhale, Aniruddha Vanderbilt Univ ISIS Dept EECS Nashville TN 37235 USA

ISBN: (纸本)9783642023507

The quality of a software architecture for component(1)-based distributed systems is defined not just by its source code but also by other systemic artifacts, such as the assembly, deployment, and configuration of the application components and their component middleware. In the context of distributed, real-time, and embedded (DRE) component-based systems, bin packing algorithms and schedulability analysis have been used to make deployment and configuration decisions. However, these algorithms make only coarse-grained node assignments but do not indicate how components are allocated to different middleware containers on the node, which are known to impact runtime system performance and resource consumption. This paper presents a model transformation-based algorithm that combines user-specified quality of service (QoS) requirements with the node assignments to provide a finer level of granularity and precision in the deployment and configuration decisions. A beneficial side effect of our work lies in how these decisions can be leveraged by additional backend performance optimization techniques. We evaluate our approach and compare it against the existing state-of-the-art in the context of a representative DRE system.

关键词： Model-driven engineering Graph/model transformations component-based systems deployment and configuration

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Weaving deployment aspects into domain-specific models

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INTERNATIONAL JOURNAL OF SOFTWARE ENGINEERING AND KNOWLEDGE ENGINEERING 2006年第3期16卷 403-424页

作者： Balasubramanian, Krishnakumar Gokhale, Aniruddha Lin, Yuehua Zhang, Jing Gray, Jeff Vanderbilt Univ Dept Elect Engn & Comp Sci Nashville TN 37235 USA Univ Alabama Birmingham Dept Comp & Informat Sci Birmingham AL 35294 USA

Domain-specific models increase the level of abstraction used to develop large-scale component-based systems. Model-driven development (MDD) approaches (e.g., Model-Integrated Computing and Model-Driven Architecture) emphasize the use of models at all stages of system development. Decomposing problems using MDD approaches may result in a separation of the artifacts in a way that impedes comprehension. For example, a single concern (such as deployment of a distributed system) may crosscut different orthogonal activities (such as component specification, interaction, packaging and planning). To keep track of all entities associated with a component, and to ensure that the constraints for the system as a whole are not violated, a purely model-driven approach imposes extra effort, thereby negating some of the benefits of MDD. This paper provides three contributions to the study of applying aspect-oriented techniques to address the crosscutting challenges of model-driven component-based distributed systems development. First, we identify the sources of crosscutting concerns that typically arise in model-driven development of component-based systems. Second, we describe how aspect-oriented model weaving helps modularize these crosscutting concerns using model transformations. Third, we describe how we have applied model weaving using a toot called the Constraint-Specification Aspect Weaver (C-SAW) in the context of the Platform-Independent Component Modeling Language (PICML), which is a domain-specific modeling language for developing component-based systems. A case study of a joint-emergency response system is presented to express the challenges in modeling a typical distributed system. Our experience shows that model weaving is an effective and scalable technique for dealing with crosscutting aspects of component-based systems development.

关键词： component-based middleware deployment and configuration aspect modeling domain-specific modeling

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