Learners examine operating system theory, installation, upgrading, configuring operating system and hardware, file systems, virtualization, security, hardware options, storage, resource sharing, network connectivity, maintenance, and troubleshooting.
This edition helps readers understand the fundamental concepts of computer operating systems. In addition, general information introduces many other operating systems. Operating Systems Demystified describes the features common to most of today's popular operating systems and how they handle complex tasks.
Written in a step-by-step format, this practical guide begins with an overview of what operating systems are and how they are designed. The book then offers in-depth coverage of the boot process; CPU management; deadlocks; memory, disk, and file management; network operating systems; and the essentials of system security. Detailed examples and concise explanations make it easy to understand even the technical material, and end-of-chapter quizzes and a final exam help reinforce key concepts.
It's a no-brainer! You'll learn about: Fundamentals of operating system design Differences between menu- and command-driven user interfaces CPU scheduling and deadlocks Management of RAM and virtual memory Device management for hard drives, CDs, DVDs, and Blu-ray drives Networking basics, including wireless LANs and virtual private networks Key concepts of computer and data security Simple enough for a beginner, but challenging enough for an advanced student, Operating Systems Demystified helps you learn the essential elements of OS design and everyday use.
An operating system is probably the most important part of the body of soft ware which goes with any modern computer system. I ts importance is reflected in the large amount of manpower usually invested in its construction, and in the mystique by which it is often surrounded.
To the non-expert the design and construction of operating systems has often appeared an activity impenetrable to those who do not practise it. I hope this book will go some way toward dispelling the mystique, and encourage a greater general understanding of the principles on which operating systems are constructed. The material in the book is based on a course of lectures I have given for the past few years to undergraduate students of computer science.
The book is therefore a suitable introduction to operating systems for students who have a basic grounding in computer science, or for people who have worked with computers for some time. Ideally the reader should have a knowledge of prorramming and be familiar with general machine architecture, common data structures such as lists and trees, and the functions of system software such as compilers, loaders, and editors.
I t will also be helpful if he has had some experience of using a large operating system, seeing it, as it were, from the out side.
This in-depth book prepares you for any or all four exams, with full coverage of all exam objectives. Includes all chapter review questions and 8 total practice exams.
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The compound of the Kolonie was well lit by the moon. It was built in the basic form of a barrack square and was perhaps fifty yards across. Eight huts faced on to this central square. In a system using the relocatable dynamic partitions scheme, given the following situation and using decimal form : Job W is loaded into memory starting at memory location K.
Calculate the exact starting address for Job W in bytes. Using your own words, explain the role of the bounds register. Exercises, Chap 2 Describe in your own words the role of the relocation register. Answer: This hardware element, the relocation register, tracks the number of bytes that a job has been moved in main memory as a result of memory compaction. If the relocation register holds the value , was the relocated job moved toward lower or higher addressable end of main memory?
Answer: It was moved toward the lower addressable end of memory By how many kilobytes was it moved? Students should explain how they reached their conclusion by showing their work. In a system using the fixed partitions memory allocation scheme, given the following situation and using decimal form : After Job J is loaded into a partition of size 50K, the resulting fragmentation is bytes.
Perform the following: a. What is the size of Job J in bytes? What type of fragmentation is caused? Answer: Internal fragmentation Students should show their calculations and explain how they know that the fragmentation is between partitions indicating external fragmentation and not within partitions, which would indicate internal fragmentation.
Exercises, Chap 2 Advanced Exercises The relocation example presented in the chapter implies that compaction is done entirely in memory, without secondary storage.
Can all free sections of memory be merged into one contiguous block using this approach? Why or why not? In this chapter we described one of several ways to compact memory. Some people suggest an alternate method: all jobs could be copied to a secondary storage device and then reloaded and relocated contiguously into main memory, thus creating a single free block after all jobs have been recopied into memory.
Is this viable? Could you devise a better way to compact memory? Write your algorithm and explain why it is better. Answer: This type of compaction may prove to be more time consuming than the previous one because it requires access to a secondary storage device.
In addition, if the disk was a device dedicated only to compaction, then its hardware components could also be set to optimize the seek time. When using secondary storage one needs to remember that a store and load operation are performed every time increasing the time needed to complete compaction. Given the memory configuration in Figure 2. Can Job 4 K be accommodated? If relocation is used, after memory compaction, what are the contents of the relocation registers for Job 1, Job 2, and Job 3?
What are the contents of the relocation register for Job 4 after it has been loaded into memory? Answer: The relocation register for Job 4 is set to zero because it has just been loaded into memory. An instruction that is part of Job 1 was originally loaded into memory location 22K. What is its new location after compaction? Answer Its location has not changed because Job 1 has not been relocated.
An instruction that is part of Job 2 was originally loaded into memory location 55K. An instruction that is part of Job 3 was originally loaded into memory location 80K. If an instruction was originally loaded into memory location K, what is its new location after compaction?
Programming Exercises Here is a long-term programming project. Use the information that follows to complete this exercise. Each user program runs in a single group of contiguous storage locations. Users state their storage requirements and time units for CPU usage on their Job Control Card it used to, and still does, work this way, although cards may not be used.
The job remains in memory until completion. A total of 50, memory locations are available, divided into blocks as indicated in the previous table. Write or calculate an event-driven simulation to help you decide which storage placement strategy should be used at this installation. Your program would use the job stream and memory partitioning as indicated previously.
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