Programmustbebrought(fromdisk)intomemoryand placedwithinaprocessforittoberun MainmemoryandregistersareonlystorageCPUcan accessdirectly RegisteraccessinoneCPUclock(orless)MainmemorycantakemanycyclesCachesitsbetweenmainmemoryandCPUregistersProtectionofmemoryrequiredtoensurecorrectoperation 8.4 B...
Main memory usually into two partitions: ? Resident operating system, usually held in low memory with interrupt vector ? User processes then held in high memory ? Relocation registers used to protect user processes from each other, and from changing operating-system code and data ? Base register...
操作系统(OS, Operating System) 课件:第4章存储管理1 热度: 页数:130 操作系统原理operating-system-principlesppt课件 热度: 页数:22 操作系统(OS, Operating System) 课件:第6章文件管理 热度: 页数:68 《操作系统概念Operating System Concepts》原配课件PPT-ch08 Main Memory 热度: 页数:57 《操...
Programmustbebrought(fromdisk)intomemoryandplacedwithinaprocessforittoberun MainmemoryandregistersareonlystorageCPUcanaccessdirectly RegisteraccessinoneCPUclock(orless)MainmemorycantakemanycyclesCachesitsbetweenmainmemoryandCPUregistersProtectionofmemoryrequiredtoensurecorrectoperation 8.4 Base...
UserOperating-SystemInterface(3/3)•OftenusedUNIXcommand –ls:displaythefilesinthecurrentfolder–rmfilename:removefilename–cdpath:changetheworkingdirectorytopath •cd..:changetheworkingdirectorytotheupperdirectory ––––chmod755:changetheaccessmodepwd:displaythepathoftheworkingdicrectoryps:displaythe...
11WhatisanOperatingSystem什么是操作系统.ppt Operating System 教学目的与任务 《操作系统》是计算机应用专业和计算机软件专业的专业基础课。 通过本课程的学习,要求学生理解操作系统在计算机系统中的作用、地位和特点,熟练掌握和运用操作系统在进行计算机软硬件资源管理和调度时常用的概念、方法、策略、算法、手段等。
* Process Scheduling Queues Job queue – set of all processes in the system. Ready queue – set of all processes residing in main memory, ready and waiting to execute. Device queues – set of processes waiting for an I/O device. Process migration between the various queues. 进程调度队列 *...
8、of OS functions exists for ensuring the efficient operation of the system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles,mainmemory, and...
Anoperatingsystemissoftware,consistingofprogramsanddatathatrunsoncomputersandmanagesthecomputerhardwareandprovidescommonservices forefficientexecutionofvariousapplicationsoftware.操作系统包括程序和数据的软件，运行在计算机和管理计算机硬件，并提供各种常用的有效执行服务应用软件。Forhardwarefunctionssuchasinputandoutputandmemor...
引导程序一般位于固件,如ROM或EEOROM(Electrically Erasable Programable Read-Only Memory)。 CPU只能从内存中加载指令,因此执行程序必须位于内存中。大多数程序都保存在磁盘上,需要运行时才加载到可读内存,一般为动态随机访问内存(DRAM)。 操作系统对存储设备的物理性质进行了抽象,并定义了逻辑存储单元,即文件。操作系统...