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Unformatted text preview: CSE 420/598 FALL 1994 FINAL EXAM NAME Put Name on Every Page 1. (15) Performance Assume the 5 stage pipeline with a structural hazard shown below. Suppose that data references constitute 25% of the mix and that ideal CPI of the pipelined machine, ignoring the structural hazard, is 1.3. Question included a figure like figure A.5. Question is relevant. (a) (5) What is the speedup of this machine over an unpipelined machine if there were no structural hazards? Question is relevant. (b) (10) Disregarding any other performance losses, how much faster is the ideal machine without the memory structural hazard, versus the machine with the hazard? Question is relevant. 2. (6) Pipeline Performance Give two reasons why increasing the depth of a pipeline does not always increase performance Question is relevant. 1)Pipelining increases the CPU instruction throughput but it does not reduce the execution time of an individual instruction, in fact usually increases the execution time of each instruction due to overhead.individual instruction, in fact usually increases the execution time of each instruction due to overhead....
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- Spring '08
- Computer Architecture, Central processing unit, Instruction pipeline, Structural hazard, Pipeline Hazards