Q$1$: Consider two computers, P$1$ and P$2,$ of the same instruction set $($ISA$).$ We have

a program of $7\mathrm{.}5{10}^9$ instructions and we want to run this program on P$1$ and P$2.$

The P$1$ computer is a $5GHz$ machine with CPI of $0\mathrm{.}8.$ The P$2$ computer is a $6GHz$

machine with CPI of $1\mathrm{.}2.$

$($a$)$ What is the CPU time of P$1$ computer to run this program?

$($b$)$ What is the CPU time of P$2$ computer to run this program?

$($c$)$ Which computer is faster?

$($d$)$ How many times that computer is faster than another?

$($a$)$ Answer is:

A$.160$ ms

B$.1\mathrm{.}2$ s

C$.1\mathrm{.}2$ ns

D$.1\mathrm{.}5$ s

$($b$)$ Answer is:

A$.1\mathrm{.}2$ s

B$.54$ ns

C$.200$ ms

D$.1\mathrm{.}5$ s

$($c$)$ Answer is:

A$.$ Comparison cannot be done because they based on same ISA

B$.$ They have the same speed

C$.$ Computer $A$ is faster than Computer $B$

D$.$ Computer $B$ is faster than Computer $A$

$($d$)$ Answer is:

A$.2$ times

B$.1\mathrm{.}2$ times

C$.0\mathrm{.}8$ times

D$.1\mathrm{.}25$ times