Dear students here we provide notes for Anna university 4TH sem Subject CS OPERATING SYSTEM notes pdf. you can download the OS notes as per the. Class lecture notes for second Year,fourth semester Operating Systems (Subject Code: CS) is available here in PDF formats for you to. Why is the Operating System viewed as a resource allocator & control program? 3. What is ii) Write short notes on co-operating process and schedulers. (8).

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Anna University—Chemistry 1—January Question What are the most common schemes for defining the logical structure of a directory? A hard disk having cylinders, numbered from 0 to What is preemptive and no preemptive scheduling?

CS2254 Operating Systems Important Questions Nov Dec 2013 – CS2254 Part B Important Questions

What is the total distance in cylinders that the disk arm moves to satisfy the entire pending request for each of the following disk-scheduling algorithms? Define busy waiting and spin lock.

What are the disadvantages of linked allocation? What are the allocation methods of a disk space? What is the information associated with an open file? What is sector sparing? What are the opeerating problems to implement demand paging? The processes are assumed to have arrived in the order p1, p2, p3, p4, p5, all at time 0.


What are the various page replacement algorithms used for page replacement?

Anna University 4th Semester CSE Notes

What do you mean by best fit? Write short notes about Process concept and process scheduling. What is an operating system? Define request edge and assignment edge.

What is real time system? Explain the various page replacement strategies. What are the common strategies to select a free hole from a set of available holes?

What is the use of inter process communication? Write notes about disk management and swap-space management. What is the use of fork and exec system calls?

List the various file attributes. What are the drawbacks of contiguous allocation of disk space? Briefly explain the types of system calls provided by a typical operating system. What is critical section problem?

What are the various scheduling criteria for CPU scheduling? What is the kernel? What is oprrating Dispatcher? Define seek time and latency time. Digital Logic Circuits – Circuit using Boolean exp What is virtual memory?

  ISO 11898-1 PDF

What are the benefits OS co-operating processes? What is logical address space and physical address space?


What is a file? What are the various disk-scheduling algorithms? Consider the following set of process, with the length of the CPU-burst time given in milliseconds: Anna University – Mathematics 1 – January Que State the advantage of multiprocessor system.

The status of the queue is as follows. Differentiate tightly coupled systems and loosely coupled systems.

Engineering Chemistry 1—Question Bank Editio What are batch systems? Write about critical regions and monitors. Define logical address and physical address. Explain about Multi-Threading Models. Define rotational latency and disk bandwidth. Explain the various types of computer systems. What is turnaround time?

What is co-operative process?