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Question 15Asked in UGC NET Computer Science, December 2014 (Paper II & III, Selected Questions)

In a demand paging memory system, page table is held in registers. The time taken to service a page fault is 8 m. sec. if an empty frame is available or if…

In a demand paging memory system, page table is held in registers. The time taken to service a page fault is 8 m. sec. if an empty frame is available or if the replaced page is not modified, and it takes 20 m. sec. if the replaced page is modified. What is the average access time to service a page fault assuming that the page to be replaced is modified 70% of the time?
  1. A11.6 m. sec.
  2. B16.4 m. sec.
  3. C28 m. sec.
  4. D14 m. sec.
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Correct answer: (B) 16.4 m. sec.

Explanation

Average time to service a page fault = 0.7 × 20 + 0.3 × 8 = 14 + 2.4 = 16.4 m. sec.

From UGC NET Computer Science PYQ, December 2014 (Paper II & III, Selected Questions)

This is question 15 of UGC NET Computer Science PYQ, December 2014 (Paper II & III, Selected Questions). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.