Supporting end-to-end quality of service properties in OMG data distribution service publish/subscribe middleware over wide area networks

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• 作者：Akram Hakiri ; Pascal Berthou ; Aniruddha Gokhale ; Douglas C. Schmidt ; Thierry Gayraud
• 关键词：DDS services ; Schedulability ; QoS Framework ; DiffServ
• 刊名：Journal of Systems and Software
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：86
• 期：10
• 页码：2574-2593
• 全文大小：4027 K

文摘

Assuring end-to-end quality-of-service (QoS) in distributed real-time and embedded (DRE) systems is hard due to the heterogeneity and scale of communication networks, transient behavior, and the lack of mechanisms that holistically schedule different resources end-to-end. This paper makes two contributions to research focusing on overcoming these problems in the context of wide area network (WAN)-based DRE applications that use the OMG Data Distribution Service (DDS) QoS-enabled publish/subscribe middleware. First, it provides an analytical approach to bound the delays incurred along the critical path in a typical DDS-based publish/subscribe stream, which helps ensure predictable end-to-end delays. Second, it presents the design and evaluation of a policy-driven framework called Velox. Velox combines multi-layer, standards-based technologies¡ªincluding the OMG DDS and IP DiffServ¡ªto support end-to-end QoS in heterogeneous networks and shield applications from the details of network QoS mechanisms by specifying per-flow QoS requirements. The results of empirical tests conducted using Velox show how combining DDS with DiffServ enhances the schedulability and predictability of DRE applications, improves data delivery over heterogeneous IP networks, and provides network-level differentiated performance.