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. Run the program until all jobs have been executed with the memory as is in order by address. This will give you the first-fit type performance results. Sort the memory partitions by size and run the program a second time; this will give you the best-fit performance results.
For both parts a. Throughput how many jobs are processed per given time unit 2. Storage utilization percentage of partitions never used, percentage of partitions heavily used, and so on. Exercises, Chap 2 3. Waiting queue length 4. Waiting time in queue 5. Internal fragmentation Given that jobs are served on a first-come, first-served basis: c. Explain how the system handles conflicts when jobs are put into a waiting queue and there are still jobs entering the system—which job goes first?
Look at the results from the best-fit run and compare them with the results from the first-fit run. Explain what the results indicate about the performance of the system for this job mix and memory organization.
Is one method of partitioning better than the other? Could you recommend one method over the other given your sample run? Would this hold in all cases? Write some conclusions and recommendations. This would require that a sort by time be performed on the job list before running the program. Does this make a difference in the results? Does it make a difference in your analysis?
Does it make a difference in your. Exercises, Chap 2 conclusions and recommendations? The program should be run twice to test this new policy with both best-fit and first-fit. This would require that a sort by job size be performed on the job list before running the program. How do the results compare to the previous two sets of results?
Will your analysis change? Will your conclusions change? Computer Systems Laboratory. E-Mail Course Description This course covers topics on general operating system concepts such as process management, memory management, IO systems, and file systems, with the in-depth study on the latest Linux operating system.
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Kernel, also called the core of the operating system, provides the most basic level of control over all the hardware resources in the computer. User interface, also known as a shell, is the component of the operating system which is integral for a human to interact with the computer.
Command line interface and graphical user interface are the two major types of user interface. This book provides significant information of this discipline to help develop a good understanding of operating systems and related fields.
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