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Question:


In the WSClock algorithm of Fig. 3-20(c), the hand points to a page with R = 0. If ? = 400, will this page be removed? What about if ? = 1000?

In the WSClock algorithm of Fig. 3-20(c), the hand

Answer:


Welcome Student

if the hand points to has R=0  Shown in your question

and the age is greater than x and the page is clean , it is not working set and valid

copy exists on the disk

Here 2204 is Current Virtual time taken

If age of the page is 2204 - 1213 = 991.

If T=400 , Its definitely out of the working set and it was not recently referenced so it will be evicted

the T=1000 the situation is different .. Now the page falls within the woring set , so it is not removed

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