CPU周期

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CPU周期又称机器周期,机器内部各种操作大致可归属为对CPU内部的操作和对主存的操作两大类,由于CPU内部操作速度较快,CPU访问一次内存所花的时间较长,因此用从内存读取一条指令字的最短时间来定义,这个基准时间就是CPU周期(机器周期)。一个指令周期常由若干CPU周期构成。
中文名
CPU周期
又    称
机器周期
分    类
内部的操作和对主存的操作
构    成
一个指令周期常由若干CPU周期
Usually, the time required for the execution of one simple processor operation such as an addition; this time is normally the reciprocal of the clock rate. The term has been used formerly for the time required for the fetching and execution of one simple (e.g. add or subtract) machine instruction; this use however is inappropriate now when most processors exploit pipelining. The CPU cycle time is one of many figures-of-merit for a computer system. See also computer power, cycle.
词条标签:
计算机学