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ISRO2011-73

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Belady's anomaly means

  1. Page fault rate is constant even on increasing the number of allocated frames
  2. Page fault rate may increase on increasing the number of allocated frames
  3. Page fault rate may increase on decreasing the number of allocated frames
  4. Page fault rate may decrease on increasing the number of allocated frames
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ans is (b)

In computer storage, Bélády's anomaly is the name given to the phenomenon where increasing the number of page frames results in an increase in the number of page faults for a given memory access pattern. This phenomenon is commonly experienced when using the First in First Out (FIFO) page replacement algorithm.

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