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?
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?
Chapter12: Secondary Storage Management
Section: Chapter Questions
Problem 12VE
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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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