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Efficient Scheduling Algorithms for Real-Time Multiprocessor Systems

Published: 01 April 1990 Publication History

Abstract

Efficient scheduling algorithms based on heuristic functions are developed for scheduling a set of tasks on a multiprocessor system. The tasks are characterized by worst-case computation times, deadlines, and resources requirements. Starting with an empty partial schedule, each step of the search extends the current partial schedule by including one of the tasks yet to be scheduled. The heuristic functions used in the algorithm actively direct the search for a feasible schedule, i.e. they help choose the task that extends the current partial schedule. Two scheduling algorithms are evaluated by simulation. To extend the current partial schedule, one of the algorithms considers, at each step of the search, all the tasks that are yet to be scheduled as candidates. The second focuses its attention on a small subset of tasks with the shortest deadlines. The second algorithm is shown to be very effective when the maximum allowable scheduling overhead is fixed. This algorithm is hence appropriate for dynamic scheduling in real-time systems.

References

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Information

Published In

cover image IEEE Transactions on Parallel and Distributed Systems
IEEE Transactions on Parallel and Distributed Systems  Volume 1, Issue 2
April 1990
129 pages

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IEEE Press

Publication History

Published: 01 April 1990

Author Tags

  1. Index Termsdeadlines
  2. deadlines
  3. dynamic scheduling
  4. feasible schedule
  5. heuristic functions
  6. multiprocessing systems
  7. partial schedule
  8. real-time multiprocessor systems
  9. real-time systems
  10. resources requirements
  11. scheduling
  12. scheduling algorithms
  13. worst-case computation times

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