Highlights from last week

• Performance metrics

  • Use (weighted) arithmetic means for execution times
  • Use (weighted) harmonic means for rates
  • CPU exec. time = Instruction count*? CPIi*fi *clock cycle time
  • We’ll talk about “contributions to the CPI” from, e.g.,
    • Hazards in the pipeline
    • Cache misses
    • Branch mispredictions etc.

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