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csee4824_2005midterm

# csee4824_2005midterm - CSEE w4824 Prof Luca Carloni MIDTERM...

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CSEE w4824 MIDTERM EXAM Handout 10 Prof. Luca Carloni November 1, 2005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Name (please print) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Signature Time: 75 minutes (+ 5 minutes extra wrapup) Total Points : 200 Instructions : 1. Write and sign your name now on this sheet. 2. Do all 3 problems, writing on the handout itself. Use the backs of previous pages for scrap work. 3. Show all work. If you cannot finish a problem, your written work will help us to give you partial credit. (NOTE: You dont need to write pages of explanation; just be clear.) 4. Write legibly and clearly. 5. Work alone. 6. No computers, PDAs, Palm Pilots, calculators, or other electronic equiment may be used. 7. Read each question carefully before answering it. Try to solve the problems that seem easy before attacking the harder ones.

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Problem 1 . Performance Analysis (50 points) . (a). In an attempt to improve the overall performance of a given machine with respect to a target benchmark suite a designer is considering an enhancement X that applies to a subset I of instruc- tions which corresponds to 30% of the originally dynamically executed instructions. Enhancement X speeds up each instruction in I by a factor S x = 2 . After listening to the presentation of en- hancement X, another member of the design team proposes a second enhancement Y that is made possible by the work of her colleague. Enhancement Y applies to the same set of instruction I that have been enhanced by X, and speeds each of them up by an additional factor S y = 2 . Compute both the total speedup totalSpeedup x due to enhancement X and the total speedup totalSpeedup y due to enhancement Y (with respect to the machine that has been enhanced with X).
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