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Match the algorithm with its utilisation bound for a large task set.

1. Rate monotonic   2. Earliest deadline first   3. Rate monotonic with harmonic periods

P. 1.000   Q. 0.693   R. 1.000 also

  • A.1-Q, 2-P, 3-R
  • B.1-P, 2-Q, 3-R
  • C.1-Q, 2-R, 3-P
  • D.1-R, 2-P, 3-Q

Answer: A

The three figures are the ones to carry: fixed priorities cost about thirty per cent of the processor in the general case, dynamic priorities cost nothing, and choosing harmonic periods recovers the loss without abandoning fixed priorities.

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