Operating System Viva Questions

Operating System Viva Questions

Operating System is semester 4 subject of final year of computer engineering at Mumbai University. Prerequisite for studying this subject are Data structures and Computer architecture.

An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and video game consoles to web servers and supercomputers. Early computers were built to perform a series of single tasks, like a calculator. Basic operating system features were developed in the 1950s, such as resident monitor functions that could automatically run different programs in succession to speed up processing. Operating systems did not exist in their modern and more complex forms until the early 1960s. Hardware features were added, that enabled use of runtime libraries, interrupts, and parallel processing. When personal computers became popular in the 1980s, operating systems were made for them similar in concept to those used on larger computers.

Course Objectives for Operating System is to introduce basic concepts and functions of operating systems. To understand the concept of process, thread and resource management. To understand the concepts of process synchronization and deadlock. To understand various Memory, I/O and File management techniques. Course Outcome for Operating System is to understand the objectives, functions and structure of OS Analyze the concept of process management and evaluate performance of process scheduling algorithms.  Understand and apply the concepts of synchronization and deadlocks. Evaluate performance of Memory allocation and replacement policies. Understand the concepts of file management. Apply concepts of I/O management and analyze techniques of disk scheduling.

Module Operating system Overview consists of the following subtopics Introduction, Objectives, Functions and Evolution of Operating System consists of the following subtopics Operating system structures: Layered, Monolithic and Microkernel. Linux Kernel, Shell and System Calls.  Process and Module Process Scheduling consists of the following subtopics Concept of a Process, Process States, Process Description, Process Control Block. Uniprocessor Scheduling-Types: Preemptive and Non-preemptive scheduling algorithms (FCFS, SJF, SRTN, Priority, RR) Threads: Definition and Types, Concept of Multithreading. Module Process Synchronization and Deadlocks Concurrency: consists of the following subtopics Principles of Concurrency, Inter-Process Communication, Process Synchronization. Mutual Exclusion: Requirements, Hardware Support (TSL), Operating System Support (Semaphores), Producer and Consumer problem. Principles of Deadlock: Conditions and Resource, Allocation Graphs, Deadlock Prevention, Deadlock Avoidance: Banker‟s Algorithm, Deadlock Detection and Recovery, Dining Philosophers Problem. Module Memory Management consists of the following subtopics Memory Management Requirements, Memory Partitioning: Fixed, Partitioning, Dynamic Partitioning, Memory Allocation Strategies: Best-Fit, First Fit, Worst Fit, Paging and Segmentation, TLB ,Virtual Memory: Demand Paging, Page Replacement Strategies: FIFO, Optimal, LRU, Thrashing. Module  File Management consists of the following subtopics Overview, File Organization and Access, File Directories, File Sharing  I/O management I/O devices, Organization of the I/O Function, Disk Organization, I/O Management and Disk Scheduling: FCFS, SSTF, SCAN, CSCAN, LOOK, C-LOOK.

Suggested Reference books for subject Operating System from Mumbai university are as follows  Achyut Godbole and Atul Kahate, Operating Systems, McGraw Hill Education, 3rdEdition Andrew Tannenbaum, Operating System Design and Implementation, Pearson, 3rdEdition. Maurice J. Bach, “Design of UNIX Operating System”, PHI . Sumitabha Das, “UNIX: Concepts and Applications”, McGraw Hill, 4thEdition. Suggested Texts books for subject Operating System from Mumbai university are as follows  William Stallings, Operating System: Internals and Design Principles, Prentice-Hall, 8thEdition, 2014, ISBN-10: 0133805913.ISBN-13: 9780133805918. Abraham Silberschatz, Peter Baer Galvin, and Greg Gagne, Operating System Concepts, John Wiley &Sons, Inc., 9 traditions, 2016, ISBN 978-81-265-5427-0.

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