zoukankan      html  css  js  c++  java
  • Computer science 学习笔记操作系统(1)

    小半年后将迎来一次重要的考试,从现在开始把以前学习的内容和新学到的内容做一个系统的整理。

    Operating Systems - Internals and Design Principles

    1 Computer System Overview

    1.1 Basic Elements

    Processor, Main memory, I/O modules, System bus

    1.2 Processor Registers

    PC - Program counter      IR - Instruction register

    MAR - Memory address register  MBR - Memory buffer register

    I/O AR - I/O address register   I/O BR - I/O buffer register

    User-visible registers - Data, Address, Index, Segment pointer, Stack pointer

    Control ans status registers - PC, IR, Condition codes(flags)

    1.3 Instruction execution

    Fetch and Execute

    1.4 Interrupts

    Short and long I/O wait

    1.5 The memory hierarchy

    As one goes down the hierarchy, occur:

    a. Decreasing cost per bit

    b. Increasing capacity

    c. Increasing access time

    d. Decreasing frequency of access to the memory by the processor

    1.6 Cache memory

    Cache size, Block size, Mapping function, Replacement algorithm, Write policy.

    Hit ratio increases then decreases when the block size keeps increasing.

    Replace the block that is least likely to be needed in the near future.

    least-recently-used (LRU) is a hardware mechanism.

    1.6 I/O communication techniques

    Programmed I/O, Interrupt-driven I/O, Direct memory access (DMA).

    Review

    In general, what are the strategies for exploiting spatial locality and temporal locality?

    http://www.cnblogs.com/yanlingyin/archive/2012/02/11/2347116.html (局部性原理浅析)

  • 相关阅读:
    js全局变量和局部变量
    mysql分组后保留n条数据
    记一次微信公众号的开发与后台搭建
    Excel 导入 Sql Server出错——“文本被截断,或者一个或多个字符在目标代码页中没有匹配项”错误的解决
    一言之思-3
    时间获取
    sql基础的基础
    一言之思-2
    一言之思
    node.js日期
  • 原文地址:https://www.cnblogs.com/fatlyz/p/2908973.html
Copyright © 2011-2022 走看看