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作业：

作业：. 从调度的层次上看，有哪几种调度？试画出同时具有这几种调度的队列模型图。 在选择调度的方式和算法时，面向用户的调度准则有哪些？面向系统的呢？ 什么是 CPU 繁忙形作业？什么是 IO 繁忙形作业？当 采用 FCFS 算法时， 对 CPU 繁忙性和 IO 繁忙形这两种作业分别有 何影响？ 提示：阅读 参考书： Operating System Concepts ， P159 页，掌握名词“ convoy effect” （即护卫效应 ） 名词解释 ：饿死现象 对于 SJF 调度中第一个例子，给出可抢占方式 下的周转时间、带权周转时间。.

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作业：

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  1. 作业： • 从调度的层次上看，有哪几种调度？试画出同时具有这几种调度的队列模型图。 • 在选择调度的方式和算法时，面向用户的调度准则有哪些？面向系统的呢？ • 什么是CPU繁忙形作业？什么是IO繁忙形作业？当采用FCFS算法时，对CPU繁忙性和IO繁忙形这两种作业分别有何影响？ • 提示：阅读参考书：Operating System Concepts，P159页，掌握名词“convoy effect”（即护卫效应） • 名词解释：饿死现象 • 对于SJF调度中第一个例子，给出可抢占方式下的周转时间、带权周转时间。

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