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a cache, main m tual memory. If ne, 10 ns are requ nory but not in th ed to load it int e is started aga

a cache, main m tual memory. If ne, 10 ns are requ nory but not in th ed to load it int e is started aga

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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A computer has a cache, main memory; and a disk used for virtual memory. If a referenced word is in the cache, 10 ns are required to access it. If it is main memory but not in the cache, total 200 ns are needed to load it into cache, and then the reference is started again. If the word is not in main memory, total 500 ms are required to fetch the word from the disk, followed by 200 ns to copy it to the cache, and then the reference is started again. The cache hit ratio is 99%, and the main memory hit ratio is 90%. What is the average time in ns to access a referenced word on this system? Ignore the time it takes to determine whether or not a reference may be found in cache or main memory. The hit ratio is the percent of the time a reference is found in the given level of the memory hierarchy.
Transcribed Image Text:A computer has a cache, main memory; and a disk used for virtual memory. If a referenced word is in the cache, 10 ns are required to access it. If it is main memory but not in the cache, total 200 ns are needed to load it into cache, and then the reference is started again. If the word is not in main memory, total 500 ms are required to fetch the word from the disk, followed by 200 ns to copy it to the cache, and then the reference is started again. The cache hit ratio is 99%, and the main memory hit ratio is 90%. What is the average time in ns to access a referenced word on this system? Ignore the time it takes to determine whether or not a reference may be found in cache or main memory. The hit ratio is the percent of the time a reference is found in the given level of the memory hierarchy.
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