A computer has a L1-cache, L2-cache, L3-cache, and main memory. If a referenced word is in theL1-Cache, 5 ns are required to access itL2-Cache, but not in the L1 cache, 10 ns are required to load it into the L1-cache and reference is started againL3-Cache, but not in the L2 cache, 20 ns are required to load it into the L2-cache and reference is started againMain memory but not in the cache, 60 ns are required to load it into the L3-cache and reference is started againThe L1-cache hit ratio is 0.9, L2-cache hit ratio is 0.8, and L3-cache hit ratio is 0.6 a.If the word is found in L1 cache, how much is the access time? b.If the word is found in L2 cache, how much is the access time? c.What is the average time in nanoseconds required to access a referenced word on this system?

If a word is in L1, the total access time is 5ns (since we don't need to find anywhere else) When…

Answered: cache, 20 ns are required to load it…

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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A computer has a L1-cache, L2-cache, L3-cache, and main memory. If a referenced word is in the

L1-Cache, 5 ns are required to access it
L2-Cache, but not in the L1 cache, 10 ns are required to load it into the L1-cache and reference is started again
L3-Cache, but not in the L2 cache, 20 ns are required to load it into the L2-cache and reference is started again
Main memory but not in the cache, 60 ns are required to load it into the L3-cache and reference is started again
The L1-cache hit ratio is 0.9, L2-cache hit ratio is 0.8, and L3-cache hit ratio is 0.6
a.If the word is found in L1 cache, how much is the access time?
b.If the word is found in L2 cache, how much is the access time?
c.What is the average time in nanoseconds required to access a referenced word on this system?

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