Topic 2 - Performance - S

Topic 2 - Performance - S - Computer Architecture...

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Computer  Architecture Performance Reading:  Sections 1.4- 1.9
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Outline  Performance Measures of performance Calculating CPU time Instruction count and CPI Amdahl’s Law Examples on the board
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     The thing about  performance , even if it's  only an illusion, is that it is a celebration of the  fact that we do contain within ourselves infinite  possibilities.” Sydney Smith
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Computer Performance What are the measures of performance? CPU clock frequency MIPS Benchmarks (SPEC etc) Throughput and execution time Methods of calculation Relative performance Comparing code segments
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Relative Performance “X is  n  time faster than Y”   Example: time taken to run a program 10s on A, 15s on B Execution TimeB / Execution TimeA = 15s / 10s = 1.5 So A is 1.5 times faster than B
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Performance improved by Reducing number of clock cycles
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Topic 2 - Performance - S - Computer Architecture...

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