Homework 11

Details

Do the following exercises from pages 144-145 of your textbook (134-135 in the full book) and the ones listed below.

Problem	Points	Comments
33	4	Answer both parts.
41	4	Answer both parts.
42	4	Make sure you understand the exact definitions of the two terms. Also, try to exhaust all possible causes of each.
43	4
47	4
Problem 1 below	4
Problem 2 below	4

1. A computer system has a cache with access rate of 1 ns (1 x 10^-9 seconds), and RAM with access rate of 50 ns (50 x 10^-9 seconds). Assume that a requested item is in the cache 95% of the time. What is the average access time for an item on this system?
2. A computer system has a cache with access rate of 1 ns (1 x 10^-9 seconds), RAM with access rate of 50 ns (50 x 10^-9 seconds), and virtual memory on the hard drive with access rate of 9 ms (9 x 10^-3 seconds). Assume that a requested item is in the cache 95% of the time, and is in the RAM 99% of the time. What is the average access time for an item on this system?