JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year OPERATING SYSTEMS Previous Question Paper (August/September - 2022 - R16)

From a user's view, the operating system is designed primarily for ease of use, performance, and security. The user is concerned with the convenience of the interface, the responsiveness of applications, and the efficient management of their own files and resources. The OS acts as an abstraction layer, hiding the complex hardware details and providing a user-friendly environment through command-line interfaces or graphical user interfaces (GUIs), allowing users to focus on task execution rather than hardware management.

From a system view, the operating system is viewed as a resource allocator and a control program. It acts as the manager of all system resources, including CPU time, memory space, file storage, and I/O devices. The OS must resolve conflicting requests for resources to ensure efficient and fair operation. Furthermore, as a control program, it manages the execution of user programs to prevent errors and improper use of the computer, ensuring system stability and security through mechanisms like process scheduling and memory protection.

A multiprocessor system, also known as a parallel system or tightly coupled system, consists of two or more processors in close communication, sharing the computer bus, clock, and sometimes memory and peripheral devices. These systems are designed to execute multiple tasks simultaneously, significantly increasing the computational power of the machine.

The primary advantages include:

• Increased Throughput: By having multiple processors working in parallel, the system can complete more work in a given time period.
• Economy of Scale: Multiprocessor systems can be cheaper than multiple single-processor systems because they share peripherals, mass storage, and power supplies.
• Increased Reliability: If one processor fails, the system can continue to function, albeit at a reduced speed, because the workload can be distributed among the remaining functional processors (graceful degradation).
• Parallel Processing: Complex tasks can be broken down into smaller sub-tasks that are executed concurrently, leading to faster completion times for compute-intensive applications.