指令周期是取出一条指令并执行这条指令的时间。一般由若干个机器周期组成,是从取指令、分析指令到执行完所需的全部时间。 指令周期类型有非访内指令的指令周期、取数指令的指令周期、存数指令的指令周期、空操作指令和转移指令的指令周期。
指令周期 [计] [计] Instruction Cycle ; Fcpu ; TCY
取指令周期 fetch cycle ; [计] instruction fetch cycle
每指令周期数 cycle-per-instruction ; cycles per instruction
内部指令周期时钟 CLKOUT
指令周期时间 [计] instruction cycle time
单指令周期CPU single cycle CPU
微指令周期 microinstruction cycle
还有不错的指令周期率 Instructions per cycle
每条指令需要的周期数 CPI
平均指令周期数 cycles per instruction
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在单指令流单数据流结构中,有单一的指令周期,在执行前,单个处理机按序取操作数。
In an SISD architecture there is a single instruction cycle; operands are fetched serially into a single processing unit before execution.
cpi值越高,则运行指令所需的周期就越多,这意味着程序的运行性能未达到最优。
A higher CPI value indicates that more cycles were necessary to run the instruction, implying suboptimal execution of the program.
POWER 5芯片有两个硬件指令线程,在每个周期都能够执行多个指令,这可以提高性能。
The POWER5 chip has two hardware instruction threads that are both capable of issuing multiple instructions per cycle, which causes a boost in performance.
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