Cool shapers: shaping real-time tasks for improved thermal guarantees

  • Authors:
  • Pratyush Kumar;Lothar Thiele

  • Affiliations:
  • Computer Engineering and Networks Laboratory, ETH Zürich;Computer Engineering and Networks Laboratory, ETH Zürich

  • Venue:
  • Proceedings of the 48th Design Automation Conference
  • Year:
  • 2011

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Abstract

With increasing power densities, managing on-chip temperatures has become an important design challenge. We propose a novel approach to this problem with the use of shapers to dynamically and selectively insert idle times during the execution of hard real-time jobs on a single speed processor. For the class of leaky bucket shapers which have a lightweight implementation, we derive the shaper such that no job misses its real-time deadline and the peak temperature is optimally reduced. The analysis and design of such shapers allows for dynamically variable streams of jobs; for instance, periodic streams with jitter. We extend our results to consider non-zero power and timing overhead in transitioning to the idle mode. With experimental results, we demonstrate that the proposed approach provides a large improvement: on average 8K peak temperature reduction or 40% increase in utilization for a given peak temperature.