Consider a demand-paging system with a paging disk that has an average  access and transfer time of 25 milliseconds. Addresses are translated through a page table in main  memory, with an access time of 1 microsecond per memory access. Thus, each memory reference  through the page table takes two accesses. To improve this time, we have added an associative  memory that reduces access time to one memory reference if the page-table entry is in the associative  memory. Assume that 75 percent of the accesses are in the associative memory and that, of those  remaining, 10 percent (or 2.5 percent of the total) cause page faults. What is the effective memory  access time?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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 Consider a demand-paging system with a paging disk that has an average 
access and transfer time of 25 milliseconds. Addresses are translated through a page table in main 
memory, with an access time of 1 microsecond per memory access. Thus, each memory reference 
through the page table takes two accesses. To improve this time, we have added an associative 
memory that reduces access time to one memory reference if the page-table entry is in the associative 
memory. Assume that 75 percent of the accesses are in the associative memory and that, of those 
remaining, 10 percent (or 2.5 percent of the total) cause page faults. What is the effective memory 
access time?

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