Question

Question 17 5 pts Assume we have primary memory access time of 82 nanoseconds, and a solid state disk with which memory access time on a swap is 107 microseconds. Compute the effective memory access time at a 0.07 page fault rate. Give your answer in nanoseconds using numbers only, and to two decimal places if necessary. Question 18 5 pts Assume we have primary memory access time of 96 nanoseconds, and a magnetic fixed disk with which memory access time on a swap is 78 milliseconds. Compute the effective memory access time at a 0.02 page fault rate. Give your answer in nanoseconds using numbers only, and to two decimal places if necessary.

Answer 1

Given,

Primary Memory Access Time (Tpma) = 82ns

Memory Access Time on Swap (Tsma) = 107ns

Page Fault Rate (Rf) = 0.07.

The Effective Memory Access Time formaulae is given below

Effective Memory Access Time (Tema) = ((1-Rf) Tpma)+( Re x Tsma)

Substituting the values,

Tema = [((1 – 0.07)x 82n) + (0.07 x 107n) Seconds

Tema = [((0.93)x 82n) + (0.07 x 107n) Seconds

Tema = |(76.26n) + (7.49n) Seconds

Tema = 83.75 nanoseconds

Tema = 83.75 nanoseconds

So the Effective Memory Access Time is 83.75ns.