# HW4-Grading Policy - 4.14 The total execution time for the...

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4.14 The total execution time for the machines are as follows: Computer A = 2 + 20 + 200 seconds = 222 seconds Computer B = 5 + 20 + 50 seconds = 75 seconds Computer C = 10 + 20 + 15 seconds = 45 seconds Thus computer C is faster. It is 75/45 = 5/3 times faster than computer B and 222/45 = 74/15 times faster than computer A. 4.15 With the new weighting the total execution time for the group of programs is: Computer A = 8 * 2 + 2 * 20 + 1 * 200 seconds = 256 seconds Computer B = 8 * 5 + 2 * 20 + 1 * 50 seconds = 130 seconds Computer C = 8 * 10 + 2 * 20 + 1 * 15 seconds = 135 seconds So with this workload, computer B is faster by a factor of 135/130 = 1.04 with respect to computer C and a factor of 256/130 = 1.97 with respect to computer A. This new weighting reflects a bias from the previous results by a bias toward program 1 and program 2, which resulted in computer A and computer B looking comparitively better than before. 5.1 Combinational logic only: a, b, c, h, i Sequential logic only: f, g, j Mixed sequential and combinational: d, e, k 5.2 a. RegWrite = 0: All R-format instructions, in addition to lw, will not work because these instructions will not be able to write their results to the register file. b. ALUop1 = 0: All R-format instructions except subtract will not work correctly because the ALU will perform subtract instead of the required ALU operation.

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c. ALUop0 = 0: beq instruction will not work because the ALU will perform addition instead of subtraction (see Figure 5.12), so the branch outcome may be wrong. d. Branch (or PCSrc) = 0: beq will not execute correctly. The branch instruction will always be not taken even when it should be taken. e. MemRead = 0: lw will not execute correctly because it will not be able to read data from memory. f. MemWrite = 0: sw will not work correctly because it will not be able to write to the data memory. 5.32
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## This note was uploaded on 05/11/2010 for the course CSE/EEE CSE/EEE230 taught by Professor Baoxinli during the Fall '08 term at ASU.

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HW4-Grading Policy - 4.14 The total execution time for the...

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