Predictable deployment in component-based enterprise distributed real-time and embedded systems

Component-based middleware, such as the Lightweight COR-BA Component Model, are increasingly used to implement large-scale distributed real-time and embedded (DRE) sys-tems. In addition to supporting the quality of service (QoS) requirements of individual DRE systems, component tech-nologies must also support bounded latencies when effecting deployment changes to DRE systems in response to chang-ing environmental conditions and operational requirements. This paper makes three contributions to the study of pre-dictable deployment latencies in DRE systems. First, we de-scribe OMG’s Deployment and Configuration (D&C) speci-fication for component-based systems and discuss how con-ventional implementations of this standard can significantly degrade deployment latencies. Second, we describe architec-tural changes and performance optimizations implemented within the Locality-Enhanced Deployment and Configura-tion Engine (LE-DAnCE) implementation of the D&C speci-fication. Finally, we analyze the performance of LE-DAnCE in the context of component deployments on 10 nodes for a representative DRE system consisting of 1,000 compo-nents. Our results show LE-DAnCE’s optimizations provide a bounded deployment latency of less than 2 seconds with 4 percent jitter