Duty of Operating System

Duration: 4 min

This video lesson is available to enrolled students.

Return to /learn/COGNIZANT-PREPARATION/operating-systems/memory-management/basics-hierarchy/asset-duty-of-operating-system after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. Communication Round: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Direct and Indirect Speech, Active Passive Voice (Voice), Verbal Analogy (Word Based Analogy), Articles, Preposition, Conjunction, Sentence Construction, English Writing Ability, Communication Assessment
  2. Quantitative Aptitude: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Speed Time and Distance, Percentage, Average, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Age Problems, Pipe and Cistern, Probability, Profit and Loss, Simple Interest and Compound Interest, Algebra
  3. Analytical and Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Puzzle Solving (Puzzles), Syllogisms, Seating Arrangements, Calendar, Clock, Blood Relations, Cubes & Dices, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning)
  4. Cognizant Gaming Aptitude: Gamified / Game Based Aptitude
  5. Java (Cluster 1): Java
  6. ANSI SQL MySQL (Cluster 1,2,3): SQL
  7. HTML, CSS, JavaScript (Cluster 1,3): HTML, CSS, JavaScript
  8. Python (Cluster 2): Python for Placements by Yash Sir
  9. Cloud Fundamentals (Cluster 2): Emerging Tech Trends
  10. C# (Cluster 3): C#
  11. OOPs: Object Oriented Programming (OOPS)
  12. Technical Assessment (Coding): Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Pseudo Codes
  13. Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  15. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  16. Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture provides a comprehensive overview of the "Duty of Operating System" specifically concerning memory management. The instructor begins by outlining three critical responsibilities that the OS must handle. These include performing address translation from logical to physical addresses, deciding which processes and data move into and out of memory while allocating space, and keeping track of currently used memory parts to ensure efficient allocation and deallocation. He then transitions to a new slide that elaborates on the first duty, introducing the concept of storing processes in main memory through two distinct approaches: contiguous allocation policy and non-contiguous allocation policy. This sets the foundation for understanding how memory is organized and accessed.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor stands before a slide titled "Duty of Operating System," which lists specific activities in connection with memory management. He focuses heavily on the first point, "Address translation from Logical address to Physical address," physically circling these terms on the screen and writing "LA" and "PA" to denote the abbreviations. He explains that the OS is responsible for this translation, as well as managing the movement of processes and tracking memory usage to ensure efficient allocation and deallocation of space. He gestures to emphasize the importance of these tasks in the overall functioning of the system, ensuring students understand the core responsibilities.

  2. 2:00 – 3:48 02:00-03:48

    The presentation shifts to a new slide stating that the first duty is translating logical addresses into physical addresses. The instructor introduces two specific approaches for storing a process in main memory: "Contiguous allocation policy" and "Non-contiguous allocation policy." He places checkmarks next to these options and draws a diagram with "PM" and "SM" connected by an arrow to visually represent the relationship between process memory and system memory. He explains how these policies facilitate the storage and management of processes, highlighting the distinction between how memory is allocated in different scenarios and why both are necessary for effective system operation.

The lecture progresses from a general overview of OS memory management duties to specific implementation strategies. It establishes that address translation is the primary duty and categorizes memory storage into contiguous and non-contiguous policies. This progression helps students understand the theoretical framework before diving into the technical details of how these allocation policies work in practice, providing a clear roadmap for the subsequent topics in the course.

Loading lesson…