Discussion
A task set with harmonic periods is schedulable under rate monotonic up to a utilisation of
Answer: C
When each period divides the next exactly, the releases line up and no capacity is lost to awkward phasing, so the full processor is available. Choosing periods as 1, 2, 4, 8 and 16 milliseconds rather than 1, 3, 7 and 13 is therefore worth real capacity.
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