Question

You are going to enhance a machine, and there are two possible improvements: either make multiply instructions run four time faster than before, or make memory access instructions run two times faster than before. You repeatedly run a program that takes 100 seconds to execute. Of this time, 20% is used for multiplication, 50% for memory access instructions, and 30% for other tasks.

A) What will the speedup be if you improve only multiplication?

B) What will the speedup be if you improve only memory access?

C) What will the speedup be if both improvements are made?

Answer 1