Multi programming operating System – Previous year gate solved questions and answer

Multi programming operating System – Previous year gate solved questions and answer

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Multiprogramming operating systems allow multiple programs to reside in memory simultaneously, enabling the CPU to switch between them to maximize utilization. This concept is integral to GATE’s Operating Systems syllabus, and understanding it is crucial for aspirants.

Key Concepts Related to Multiprogramming:

• Degree of Multiprogramming: Refers to the number of processes in memory at a given time. An optimal mix of CPU-bound and I/O-bound processes can enhance system performance.

• CPU Scheduling: Determines the order in which processes access the CPU, impacting system efficiency.

• Process Synchronization: Ensures that processes sharing resources do so without conflicts, maintaining data consistency.

GATE Previous Year Questions on Multiprogramming:

1. GATE 2015 Set 1 Question:

   Consider a system with processes P1, P2, and P3, each requiring access to a shared variable D initialized to 100. The processes execute concurrently on a uniprocessor system. What are the minimum and maximum possible values of D after all processes have completed execution?

   Solution: This question tests understanding of process synchronization in a multiprogramming environment. The minimum and maximum values of D depend on the sequence of operations performed by the processes.

2. GATE 2025 Question:

   Three concurrent processes X, Y, and Z execute code segments accessing shared variables. Each process performs P (wait) operations on semaphores before entering their code segments. How can the processes invoke P operations to ensure a deadlock-free execution?

   Solution: This question evaluates knowledge of deadlock prevention in multiprogramming systems. A specific order of P operations can prevent circular wait conditions, thereby avoiding deadlocks.

Recommended Resources for Practice:

• GATE Overflow: A comprehensive repository of GATE questions with detailed solutions, covering topics like process synchronization and CPU scheduling.

• PracticePaper: Offers previous year GATE questions on operating systems, including multiprogramming concepts.

Study Tips:

• Understand Core Concepts: Grasp the fundamentals of process management, CPU scheduling, and synchronization mechanisms.

• Solve Previous Year Papers: Regular practice with past GATE questions helps identify patterns and important topics.

• Use Quality Study Material: Refer to standard textbooks and reliable online resources to build a strong foundation.

For a visual understanding, consider watching this video on multi-processor scheduling, which is closely related to multiprogramming: