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计算机组成学习笔记1.1

计算机组成学习笔记1.1

  • Elapsed time
    总的反应时间
  • CPU time
    CPU时间=CPU Clock Cycles (CPU时钟周期=数CPU时钟循环次数)*Clock Cycle Time(时钟周期)
    =CPU Clock Cycles (CPU时钟周期数)/Clock Rate(时钟频率)
  • Instruction Count 指令数
  • Average cycles per instruction (CPI)每条计算机指令执行所需的平均周期数
    Clock Cycles =Instruction Count *Cycles per Instruction(每个指令周期数)
    CPU Time =Instruction Count *CPI* Clock Cycle Time
        =Instruction Count *CPI / Clock Rate


  • CPU time= (Instructions / program) *(Clock cycles/Instruction)*(Seconds / Clock cycle)

  • Performance depends on
     Algorithm: affects IC, possibly CPI
     Programming language: affects IC, CPI
     Compiler: affects IC, CPI
     Instruction set architecture: affects IC, CPI, Tc

  • Dynamic Power =Capacitive load * Voltage2 * Frequency
    *30 5V->1V*1000

  • MIPS (million instructions per second)每秒执行万次指令
    MIPS=Instruction count / (Execution time *10^6)
    =Instruction count / ( ( Instruction count *CPI/Clock rate ) * 10^6  )
       =Clock Rate / (CPI *10^6 )

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