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EE357-HW5-Nazarian-Fall-09

EE357-HW5-Nazarian-Fall-09 - EE 357 Homework 5 Fall 2009...

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1 EE 357 Homework 5 Fall 2009 Nazarian Name: ___________________________________________ Assigned Tuesday, Nov. 17 Due: Monday, Nov. 30 (EEB340 at 5pm) Score: ________ 1) Performance and Amdahl’s Law a) Exercises 1.3.1-1.3.3 in CO&D, 4 th Ed. page 59: Consider three different processors P1, P2, and P3 executing the same instruction set with the clock rates and CPIs given in the following table: Processor Clock Rate CPI Processor P1 2 GHz 1.5 P1 P2 1.5GHz 1.0 P2 P3 3 GHz 2.5 P3 1.3.1 Which processor has the highest performance? 1.3.2 If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions. 1.3.3 We are trying to reduce the time by 30% but this leads to an increase of 20% in the CPI. What clock rate should we have to get this time reduction? b) Exercises 1.5 (1.5.1-1.5.6) in CO&D, 4 th Ed. page 60-61. For problems 1.5.2-1.5.3 when it says that class A (or E) occurs twice as often as each of the others, let us assume that means that for every 6 instructions, on average two would be class A (or E) and one instruction from every other class: Consider two different implementations, P1 and P2, of the same instruction set. There are 5 classes of instructions, A, B, C, D, and E, in the instruction set. The clock rate and CPI of each class is given below. Clock Rate CPI Class A CPI Class B CPI Class C CPI Class D CPI Class E a. P1 1.0GHz 1 2 3 4 3 P2 1.5GHz 2 2 2 4 4 b. P1 1.GHz 1 1 2 3 2 P2 1.5GHz 1 2 3 4 3
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