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Operating system

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5.   ( a)   What is virtual memory? Describe its advantages with respect to user point of view and
           respect to system point of view.
        (b) Suppose the average page fault service time is 20 milliseconds and memory access time
              is 200 nanoseconds. Assuming, we wish to have less than 10% degradation in memory
              access when a page fault occurs, estimate the value the page fault rate must less than.

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