The results of the SPEC CPU 2006 bzip2 benchmark running on an AMD Barcelona has
ID: 2081242 • Letter: T
Question
The results of the SPEC CPU 2006 bzip2 benchmark running on an AMD Barcelona has an instruction count of 2.389E12, an execution time of 750 s, and a reference time of 9650 s. a. Find the CPI if the clock cycle time is 0.333 ns. Find the SPEC ratio. Find the increase in CPU time if the number of instructions of the benchmark is increased by 10% without affecting the CPI. Find the increase in CPU time if the number of instructions of the benchmark is increased by 10% and the CPI is increased by 5%. Find the change in the SPEC ratio for the change in (d).Explanation / Answer
A. Execution time = Instruction count X CPI X Clock cycle time
750 = 2.389 e12 X CPI X 0.333 x 10 e -9
ð CPI = 0.943
B. SPEC ratio = CPU time of reference machine / CPU time of measured machine
= 9650/750 = 12.87
C. CPI = 0.943
No. of instructions = 10/100 * 2.389 e12 + 2.389 e12 = 2.6279 e12
New CPU time = Instruction count X CPI X clock cycle time = 2.6279 e12 X 0.943 X 0.333 X 10e -9 = 825.2 S
Therefore increase in CPU time = 825.21- 750 = 75.21 s
D. No. of instructions = 2.6279 e12
CPI = 5/100 * 0.943 + 0.943 = 0.99
New CPU time = Instruction count X CPI X clock cycle time = 2.6279 e12 X0.99 X 0.333 X 10e-9 = 866.34s
Increase in CPU time = 866.34 – 750 = 116.34s
E. New Spec ratio = 9650 / 866.34 = 11.14
Change in Spec ratio = 11.14 – 12.87 = -1.73
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