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Time-Critical Computing: Some Insights and Implications

This lecture presents the challenges and research directions in time-critical computing, including power-aware scheduling and scheduling of time-critical tasks on multiprocessors.

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Time-Critical Computing: Some Insights and Implications

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  1. Time-Critical Computing:Some Insights and Implications Professor Jan Jonsson Department of Computer Science and Engineering Chalmers University of Technology

  2. Future systems execute reliable, high-throughput applications with explicit real-time constraints. Future systems execute reliable, high-throughput applications with explicit real-time constraints. Scientific context The availability of computer systems with attractive price-performance ratios has enabled: • Low-cost nodes in distributed real-time systems • Powerful telecommunication/multimedia servers • Multi-core processor nodes in embedded systems

  3. Low-cost, multi-core nodes in distributed real-time systems Scientific context

  4. Challenges Two research directions in time-critical computing: • Optimal resource allocation • Goals: maximize system performance (e.g. timing guarantees, reliability, throughput); minimize resource usage (e.g. power consumption, size, weight) • Challenges: multi-objective optimization; time-complexity • Efficient on-line scheduling • Goal: improve performance on multiprocessor systems (e.g. scheduling techniques for uniprocessors are inefficient) • Challenge: circumvent fundamental theoretical limitations(e.g. hybrid scheduling techniques are needed)

  5. Topics 1. Power-Aware Scheduling of Time-Critical Tasks: [1998] I. Hong, G. Qu, M. Potkonjak and M. Srivastava. "Synthesis Techniques for Low-Power Hard Real-Time Systems on Variable Voltage Processors” [2004] H. Aydin, R. Melhem, D. Mossé, and P. Mejia-Alvarez. "Power-Aware Scheduling for Periodic Real-Time Tasks” [2013] M. Bambagini, J. Lelli, G. Buttazzo, and G. Lipari. "On the energy-aware partitioning of real-time tasks on homogeneous multi-processor systems”

  6. Topics 2. Scheduling of Time-Critical Tasks on Multiprocessors: [2001] B. Andersson, S. Baruah and J. Jonsson. "Static-Priority Scheduling on Multiprocessors" [2005] Baker, T.P. "An analysis of EDF schedulability on a multiprocessor" [2009] K. Lakshmanan, R. Rajkumar, and J. Lehoczky. “Partitioned fixed-priority preemptive scheduling for multi-core processors”

  7. End of lecture

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