南京理工大学紫金学院《操作系统》20212022学年第一学期期末试卷

1、自觉遵守考场纪律如考试作弊此答卷无效密封线南京理工大学紫金学院操作系统2021-2022学年第一学期期末试卷院(系)_班级_学号_姓名_题号一二三四总分得分一、单选题(本大题共15个小题,每小题2分,共30分在每小题给出的四个选项中,只有一项是符合题目要求的)1、假设一个操作系统的页表项大小为4字节,页面大小为4KB,逻辑地址空间大小为4GB。那么该系统的页表需要占用多少内存空间?()A.4MBB.8MBC.16MBD.32MB2、在一个操作系统中,进程的状态转换图如下:就绪-运行,运行-就绪,运行-阻塞,阻塞-就绪。假设当前有三个进程P1、P2

4、和逻辑设备表来实现C.设备独立性意味着程序可以不考虑设备的具体类型和特性,直接使用设备D.设备独立性只对输入设备有效,对输出设备没有作用6、在一个操作系统中,进程的创建和销毁是常见的操作。假设一个应用程序需要频繁创建和销毁大量的短生命周期进程,分析这种操作对系统性能的影响,包括内存分配、资源消耗和上下文切换等,并讨论如何通过进程池、线程池等技术来优化这种情况,以及这些技术的适用场景和限制。A.频繁创建和销毁进程总是有害的B.频繁创建和销毁进程在某些情况下无害C.可以通过进程池或线程池完全解决性能问题D.进程池和线程池有适用场景和限制7、在一个具有进程通信机制的操作系统中,有进程

6、)A.20ns,110nsB.18ns,110nsC.20ns,120nsD.18ns,120ns9、操作系统的文件保护机制可以防止文件被非法访问和修改。以下关于文件保护的描述中,哪个选项是错误的?()A.文件保护可以通过访问控制列表(ACL)来实现,指定不同用户对文件的访问权限B.文件可以设置为只读、只写或读写三种访问权限C.文件的加密和解密可以提高文件的安全性,但也会增加系统的开销D.文件保护只需要在文件系统层面实现,不需要考虑操作系统的其他部分10、操作系统中的死锁问题是一个重要的研究课题。假设有三个进程P1、P2和P3,它们分别需要资源A、B和

11、,操作系统会如何处理这种情况?()A.立即终止该进程,因为内存不足无法满足其页面请求B.选择一个最近最少使用的页面换出到外存,将新页面调入内存C.随机选择一个页面换出到外存,将新页面调入内存D.拒绝该页面请求,等待用户释放其他页面后再进行调入二、简答题(本大题共3个小题,共15分)1、(本题5分)什么是剥夺式调度和非剥夺式调度?2、(本题5分)解释移动设备操作系统的电源管理机制。3、(本题5分)操作系统如何处理多核系统中的缓存一致性?三、论述题(本大题共5个小题,共25分)1、(本题5分)详细阐述操作系统中的文件加密和解密技术在文件系统中的实现,探讨加密算法的选择、密钥管理和加密文件

12、的访问控制。分析文件加密对系统性能和安全性的平衡。2、(本题5分)操作系统的系统调用是用户程序与操作系统内核交互的接口。请全面论述系统调用的作用、分类和实现方式,分析系统调用的开销和优化方法,并通过实例说明如何使用系统调用完成特定的任务。3、(本题5分)论述操作系统中的文件系统的可靠性和容错机制,研究如何防止文件丢失、损坏和数据不一致。分析备份恢复技术、日志文件的作用以及磁盘容错方法在文件系统中的应用。4、(本题5分)操作系统的安全审计功能对于检测和防范安全事件具有重要意义。论述安全审计的流程和内容,分析审计日志的存储和分析方法,探讨如何利用安全审计提高系统的安全性和可追溯性。5、(本题5分)探讨操作系统中的设备管理,包括设备的分类、I/O控制方式以及设备分配策略。分析如何提高设备的利用率和I/O性能,以及设备驱动程序的作用和编写原则。四、综合分析题(本大题共3个小题,共30分)1、(本题10分)分析操作系统如何处理文件系统的文件系统快照的空间管理和回收。2、(本题10分)研究操作系统中的资源预约和分配策略。3、(本题10分)研究操作系统中的进程组和作业控制在任务管理中的作用。第5页,共5页

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3.2022年湖南省长沙市岳麓区长郡滨江中学高考英语模拟试卷B.Online learning.C.Learning habits. 组卷:0引用:1难度:0.0 解析 4.What will the woman probably do afterwards?A.She will search something on the Internet.B.She will confirm the time of some airlines.C.She will book a flight. 组卷:0引用:1难度:0.0 解析 5.What does the woman mean?A.https://www.jyeoo.com/sj/108c4e51-f86c-44a4-b5b4-1c2939537e3c
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7.在线学习系统:打造未来教育的新形态本文介绍了Online_Study_System,一个基于PythonDjango和MySQL的在线学习平台,支持课程管理、个性化学习和社区交流。它在远程教育和知识分享方面具有广泛的应用,开源特性鼓励社区参与和创新。 摘要由CSDN通过智能技术生成 在线学习系统:打造未来教育的新形态 Online_Study_System在线学习管理系统,SSM框架的简单实践项目地址:httphttps://blog.csdn.net/gitblog_00024/article/details/137219313
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16.2024年高考英语一轮复习第26讲阅读理解应用文(核心考点)(原卷版Studentswillworkingroupstopletefourassignments(作业)duringthecourse.AlltheassignmentswillbesubmittedbytheassigneddatethroughBlackboard,ouronlinelearningandcoursemanagementsystem. DailyWork/InClassWritingsandTests/GroupWork/Homework(10%) Classactivitieswillvaryfromdaytoday,butstudentsmustbereadytopleteshortinclasswritingshttps://max.book118.com/html/2024/0531/8114102102006074.shtm
17.2016华南理工大学网络教育专升本入学考试《大学英语》测试4. Which of the following is the main factor that makes it difficult to define students' perceptions of online learning definitely? A. Learners' varied locations. B. Learners' varied characteristics. C. Learners' varied communication skills. http://www.5184pass.com/aspcms/news/2016-8-8/4529.html
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26.ImpactofExtensionsonBrowserPerformance:AnEmpirical– The stabilized energy consumption measures the energy consumption of the CPU and RAM by the entire system in joules during a fixed period of onlinelibrary.wiley.com/doi/abs/10.1002/cem.3034. Hackeling, Gavin (2017). Mastering Machine Learning with scikit-learn. Packt Publishing Ltd. http://arxiv.org/pdf/2404.06827