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Question

on a system using paging and segmentation references to swapped in locations accessible through an entry in

associative table take 200ns if the main memory page table must be  used ,the reference takes 400ns.References that results in page faults require 10ms .if the page to be replaced has been modified,5ms otherwise.if the page faults rate is 5% the associative table hit rate is 65% and 40% of replaced pages are dirty,what is the effective access time?Assume the system is running only a single process and cpu is idle during swaps.

Answer 1

Average Access time = 65% * 200 + 35% * 400 +  5% * (1- 40%) * 5,000,000 + 5% * 40% * 10,000,000
= 130 + 140 + 150, 000 + 125, 000

= 275, 270 ns.

Is something wrong with the given page fault rate?

Comments

sir why did not take time to access page also

Answer 2

The main thing is to identify what is of what percentage. 

The percentages inside the box are all given in the question!. 

Answer 3

The main thing is to identify what percentage is for what. I know this is a old question. Might help someone!