There are two processes to switch, when one run:io instruction, switch on other process. After ios, the first process's state is ready, which must switch back on it to "receive" and handle it, like bus it to main memory, this time does not use cpu/io resources, but it is necessary to consume one time.

Of cause, the "receive" operation is not cpu/io instruction, so the time will be used to invoke run/io instruction.

For the question

"Is IO_RUN_IMMEDIATE always batter than IO_RUN_LATER?"

Obviously, it base on whether the composition of instruction, that is the number and the order of run:cpu and run:io.
In the simulator, using parameter -s 10 10:50, 5:50, contrast with homework, the IO_RUN_IMMEDIATE not batter than IO_RUN_LATER.

Operating systems Chapter 4的更多相关文章

  1. 串口通信编程向导 Serial Programming Guide for POSIX Operating Systems

    https://www.cmrr.umn.edu/~strupp/serial.html#CONTENTS Introduction Chapter 1, Basics of Serial Commu ...

  2. Modern Operating Systems(Ⅰ)——2014.12.15

    进程   进程模型     进程就是一个正在执行的程序的实例  值得注意的是,若一个程序运行了两遍,则算作两个进程 创建进程 在通用系统中,有四种主要事件导致进程的创建 ①系统的初始化 ②执行了 正在 ...

  3. [No00003D]操作系统Operating Systems信号量的代码实现Coding Semaphore &死锁处理Deadlock

    操作系统Operating Systems信号量的代码实现Coding Semaphore &死锁处理Deadlock 可以操刀了—从纸上到实际 从Linux 0.11 那里学点东西… 读磁盘 ...

  4. [No00003C]操作系统Operating Systems进程同步与信号量Processes Synchronization and Semaphore

    操作系统Operating Systems进程同步与信号量Processes Synchronization and Semaphore 进程合作:多进程共同完成一个任务 从纸上到实际:生产者− − ...

  5. [No00003A]操作系统Operating Systems 内核级线程Kernel Threads内核级线程实现Create KernelThreads

    开始核心级线程 内核级线程对多核的支持怎么样? 和用户级相比,核心级线程有什么不同? ThreadCreate 是系统调用,内核管理TCB ,内核负责切换线程 如何让切换成型? − − 内核栈,TCB ...

  6. Operating Systems (COMP2006)

    Operating Systems (COMP2006) 1st Semester 2019Page 1, CRICOS Number: 00301JOperating Systems (COMP20 ...

  7. Can We Make Operating Systems Reliable and Secure?

    Andrew S. Tanenbaum, Jorrit N. Herder, and Herbert Bos Vrije Universiteit, Amsterdam Microkernels-lo ...

  8. the virtual machine is configured for 64-bit guest operating systems

    Security--Virtualization--Inter(R) Virtualization Technolog 设置为enable 本机安装的是WIN 7 ,详细版本是:Windows 7 U ...

  9. Method of address space layout randomization for windows operating systems

    A system and method for address space layout randomization ("ASLR") for a Windows operatin ...

随机推荐

  1. xampp 软件端口占用

    参考链接: https://jingyan.baidu.com/album/48b558e3ede7747f39c09a55.html?picindex=1 查看端口占用情况 参考资料: https: ...

  2. AcWing 842. 排列数字

    深搜的一道水题 https://www.acwing.com/problem/content/844/   正确输入输出 #include<bits/stdc++.h> using nam ...

  3. windows_环境变量

    今天在windows下安装了openSSH,就想在windows下也添加一个服务器地址的环境变量,添加是会了,引用却不会,网上也没找到相应的文章,就自己看了看别人的bat程序,然后找到了引用变量的方法 ...

  4. unittest学习4-跳过用例执行

    unittest支持跳过单个测试方法,甚至整个测试用例,还支持将测试用例标记为“测试失败” 基本跳过如下: import unittestimport requests,sys class MyTes ...

  5. X-Forwarded-For注入漏洞过程记录

    一.题目地址 https://www.mozhe.cn/bug/detail/QWxmdFFhVURDay90L0wxdmJXSkl5Zz09bW96aGUmozhe 二.使用工具 FireFox浏览 ...

  6. Unity手机端手势基本操作

    主要有单指移动3D物体.单指旋转3D物体.双指缩放3D物体. 基类 using UnityEngine; using System.Collections; /// <summary> / ...

  7. 【转载】Win7下如何使用GCC编译器

    转自:http://jingyan.baidu.com/article/c275f6bacc0126e33c756771.html 双击GCC安装包,mingw-get-setup.exe,点击Ins ...

  8. jquery点击添加样式，再次点击移除样式

    $("#divSetting").on("click", function () { $(this).toggleClass("open") ...

  9. 【游戏体验】Shoot'm（暴打火柴人）

    >>>点此处可试玩无敌版<<< 注意,本游戏含有少量暴力元素,13岁以下的儿童切勿尝试本款游戏 生活有压力,学习不如意,你可以尝试这款游戏发泄心中的不满 个人测评 ...

  10. Linux list_head

    在linux kernel里面链表应用非常广泛. 我们在应用程序中,定义一个链表结构通常要包含数据域,如下: typedef struct _listNode{ int data; struct _l ...