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并发、共享、虚拟、异步

并发和共享互为前提,异步和虚拟是并发的前提。

(1)并发性:单位时间内执行和调度多个程序的能力。

处理器在多个程序之间高速切换(分时交替执行)。

(注:并行度是指在同一时间点发生的事件数量)

(2)共享:系统中的资源可以被多个并发应用共享。

同时访问模式和互斥共享模式(互斥)

(3)虚拟:将一个物理实体变成多个逻辑对应体。

时分多路复用:四核八线程虚拟打印机(一台打印机处理多项打印任务)

空分复用技术:一个硬盘虚拟几个卷。

(4)异步:基于并发,分时交替(停停走走)

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