Quiz5soln

# Quiz5soln - 8 instr x(3 cycles instr x(10-9 seconds cycle =...

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CDA3101 Quiz 5 Last Name ____________________ Fall 2009 First Name ____________________ 1. (6 points) Suppose a program (running on a MIPS processor) has the following distribution of instruction types. 10% Floating point CPI = 2 20% Integer CPI = 1 20% Load/Store CPI = 3 50% Branches CPI = 4 (a) What is the average CPI for this program? Average CPI = 0.1(2) + 0.2(1) + 0.2(3) + 0.5(4) = 0.2 + 0.2 + 0.6 + 2 = 3. (b) If this program had 500 million instructions and ran on a 1GHz computer, how long would it take (in seconds)? CPU Time = (5x10
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Unformatted text preview: 8 instr) x (3 cycles / instr) x (10-9 seconds / cycle) = 1.5 seconds 2. (4 points) Suppose we enhance a computer to make all floating-point instructions run five times faster. If the execution time of some benchmark before the floating-point enhancement is 10 seconds, what will the execution time of the same benchmark after the floating-point enhancement be, if half of the 10 seconds is spent executing floating-point instructions? Amdahl’s law: Time taken after enhancement = (5/5) + 5 = 6 seconds...
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