Consider a process executing on an operating system that uses demand paging.…

GATE · 2018 · CS · Computer Science & IT

Consider a process executing on an operating system that uses demand paging. The average time for a memory access in the system is MM units if the corresponding memory page is available in memory, and DD units if the memory access causes a page fault. It has been experimentally measured that the average time taken for a memory access in the process is XX units.

Which one of the following is the correct expression for the page fault rate experienced by the process?

  1. A.

    (D–M)/(X–M)(D – M) / (X – M)

  2. B.

    (X–M)/(D–M)(X – M) / (D – M)

  3. C.

    (D–X)/(D–M)(D – X) / (D – M)

  4. D.

    (X–M)/(D–X)(X – M) / (D – X)

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