Enhancing Adaptivity via Standard Dynamic Scheduling Middleware

Christopher GillLouis MgetaYuanfang ZhangStephen TorriYamuna KrishnamurthyIrfan PyaraliDouglas C. Schmidt

This paper makes three contributions to research on QoS-enabled middleware for open distributedreal-time embedded (DRE) systems. First, it describes the design and implementation of adynamic scheduling framework based on the OMG Real-Time CORBA 1.2 specification(RTC1.2) that provides capabilities for (1) propagating QoS parameters and a locus of executionacross endsystems via a distributable thread abstraction and (2) enforcing the schedulingof multiple distributable threads dynamically using standard CORBA middleware. Second, itexamines the results of empirical studies that show how adaptive dynamic scheduling and managementof distributable threads can be enforced efficiently in standard middleware for openDRE systems. Third, it presents results from case studies of multiple adaptive middleware QoSmanagement technologies to monitor and control the quality, timeliness, and criticality of keyoperations adaptively in a representative DRE avionics system.

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