Suppose that the processor has access to two levels of memory. Level 1 contains 1000 data words and has an access time between the CPU and L1 of 2.5 nanoseconds (2.5E-9 sec); level 2 contains data 100,000 words and has an access time between L1 and L2 transfers of 5.0 nanoseconds (5.0E-9 sec) Assume that data requests by the CPU have a hit ratio, H in the L1 cascade of 0.7, and any requests missed in L! Are guaranteed to be found in L2. What is the average memory assess time in nanoseconds for data requests by the CPU?
Suppose that the processor has access to two levels of memory. Level 1 contains 1000 data words and has an access time between the CPU and L1 of 2.5 nanoseconds (2.5E-9 sec); level 2 contains data 100,000 words and has an access time between L1 and L2 transfers of 5.0 nanoseconds (5.0E-9 sec) Assume that data requests by the CPU have a hit ratio, H in the L1 cascade of 0.7, and any requests missed in L! Are guaranteed to be found in L2. What is the average memory assess time in nanoseconds for data requests by the CPU?
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
Section: Chapter Questions
Problem 1PE
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Suppose that the processor has access to two levels of memory. Level 1 contains 1000 data words and has an access time between the CPU and L1 of 2.5 nanoseconds (2.5E-9 sec); level 2 contains data 100,000 words and has an access time between L1 and L2 transfers of 5.0 nanoseconds (5.0E-9 sec) Assume that data requests by the CPU have a hit ratio, H in the L1 cascade of 0.7, and any requests missed in L! Are guaranteed to be found in L2. What is the average memory assess time in nanoseconds for data requests by the CPU?
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