EE357-Nazarian-MidtemrII_SampleQ_Sol-Fall09

EE357-Nazarian-MidtemrII_SampleQ_Sol-Fall09 - EE 357...

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Sample Question Nazarian Fall 09 Solutions 1. Short Answer (25 pts.) a. 2 Same row, different banks 1 Same row, same bank 3 Different row, same bank b. single words /blocks c. c. 25 d. b. Least Recently Used e. b. 32 f. fully associative / is physically limited to a small size g. d. Polling /Interrupts h. d. Using the bit-wise OR operator (reg = reg | 0x01) 2. a. MAX MIPS for P1: 2E9 clocks / 1 CPI = 2000 MIPS MAX MIPS for P2: 4 E9 clocks / 2 CPI = 2000 MIPS b. CPI P1 = 4*.1 + 2*.2 + 1*.2 + 2*.5 = 2 CPI Exec time = IC * 2 CPI / 2 GHz CPI P2 = 2*.1 + 6*.2 + 4*.3 + 3*.4 = 3.8 CPI Exec time = 1.2 IC * 3.8 CPI / 4 Ghz P1 is faster c. Reduction of class A by 3 clocks means a reduction in average CPI from 2 to 1.7 Reduction of class D by 1 clock means a reduction in average CPI from 2 to 1.5 Reduction of class D is better d. Problem => Need to use Amdahl’s law with execution times not CPI or other ratios. Old ExecTime = 1.2IC * 3.8CPI / 4 Ghz
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EE357-Nazarian-MidtemrII_SampleQ_Sol-Fall09 - EE 357...

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