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We present Illinois Extended Reality testbed (ILLIXR), the first fully open-source XR system and research testbed. ILLIXR enables system innovations with end-to-end co-designed hardware, compiler, OS, and algorithms, and driven by end-user perceived Quality-of-Experience (QoE) metrics. Using ILLIXR, we provide the first comprehensive quantitative analysis of performance, power, and QoE for a complete XR system and its individual components. We describe several implications of our results that propel new directions in architecture, systems, and algorithms research for domain-specific systems in general, and XR in particular. [ABSTRACT FROM AUTHOR]

Discusses the Illinois project, Global Resource Adaptation through Cooperation (GRACE), which aims to develop a cross-layer adaptation framework to reduce energy while preserving desirable application quality for mobile devices running realtime multimedia applications. Common uses of adaptation techniques; Features of a cross-layer adaptive system; Hierarchical approach adopted by the GRACE project.