Spare CASH: Reclaiming Holes to Minimize Aperiodic Response Times in a Firm Real-Time Environment
Author(s)
Thomas, Deepu C.
Gopalakrishnan, Sathish
Caccamo, Marco
Lee, Chang-Gun
Issue Date
2005-04
Keyword(s)
Real-time systems
Abstract
Scheduling periodic tasks that allow some instances to be skipped produces spare capacity in the schedule. Only a fraction of this spare capacity is uniformly distributed and can easily be reclaimed for servicing aperiodic requests. The remaining fraction of the spare capacity is non-uniformly distributed, and no existing technique has been able to reclaim it. We present a method for improving the response times of aperiodic tasks by identifying the non-uniform holes in the schedule and adding these holes as extra capacity to the capacity queue of the CASH mechanism. The non-uniform holes can account for a significant portion of spare capacity, and reclaiming this capacity results in considerable improvements to aperiodic response times.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/11019
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