What should you set as cache hit ratio

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Assume you have a computer which currently does not have any cache memory. Main memory access time is 15 nsec and disk access time is 2500 nsec. The memory hit ratio is 60%. A faster memory is always accessed before a slower one. You want to add a cache that has access time of 90 nsec such that the average access time for your computer becomes 365 nsec. What should you set as the cache hit ratio to achieve this average access time?

Reference no: EM133217561

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