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From clock cycles to instruction count and CPI

Number of clock cycles for program depends on:

  • Number of instructions executed (instruction count)
    • Determined by ISA and compiler
  • Average number of clock cycles per instruction (CPI)
    • Determined by CPU hardware
    • Usually, different instructions have different CPI
    • CPI of a program (code sequence) depends on instructions executed (instruction mix)
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pdf

owner: pavestonelaboringuntitled - (no access) - 03 Performance.pdf, p14


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