We wish to compare the performance of two different machines: M1 and M2. The following measurements have been made on these machines:

Program	Time on M1	Time on M2
1	4 seconds	2.5 seconds
2	6 seconds	12 seconds

a) Which computer is faster for each program, and how many times as fast is it?

b) If the following additional measurements were made:

Program	Instructions executed on M1	Instructions executed on M2
1	5x 109	6x 109

and the clock rates of machine M1 and M2 are 2.5GHz and 2GHz respectively, find the clock cycles per instruction (CPI) for program 1 on each computer.

c) Assuming that CPI for program 2 on each computer is the same as the CPI for program 1 found in b), find the instruction count for program 2 running on each computer using the execution times from the first table.