The access time of the cache memory is 100ns and that of main memory 1000ns.It is estimated that S0percent of the memory requests are for read and the remaining 20 percent for write. The hit ratio for read accesses only is 0.9. A write through procedure is used. What is the average access time of the system considering only memory read cycles? What is the average access time of the system for both read cycles and write requests? What is the hit ratio taking into consideration the write cycles?

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
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The access time of the cache memory is 100ns and that of main memory 1000ns.It is estimated that S0percent of the memory requests are for read and the remaining 20 percent for write. The hit ratio for read accesses only is 0.9. A write through procedure is used. What is the average access time of the system considering only memory read cycles? What is the average access time of the system for both read cycles and write requests? What is the hit ratio taking into consideration the write cycles?
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