Duty of Operating System

Duration: 4 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Ability: Percentage, Profit and Loss, Ratio and Proportion (Ratios), Average, Time and Work, Speed Time and Distance, Simple Interest and Compound Interest, Age Problems, Number System, Divisibility Rules, HCF LCM, Algebra, Permutation and Combination, Probability, Data Interpretation, Logarithm, Sequence and Series (Series), Powers and Exponents (Surds and Indices), Speed Mathematics and Basic Mathematics
  2. Logical Reasoning: Seating Arrangements, Puzzle Solving (Puzzles), Data Arrangement, Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Data Sufficiency, Venn Diagram, Inequality, Series (Number and Letter Series) (Numerical Relations and Reasoning), Logical Sequence Of Words, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning)
  3. Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Subject Verb Agreement (Verb Noun Agreement), Tenses, Articles, Preposition, Conjunction, Modals, Active Passive Voice (Voice), Direct and Indirect Speech, Vocabulary, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Completion (Fill in the blanks), Sentence Correction (Error Correction), Cloze Test (Cloze Passage), Facts, Inference and Judgements
  4. Programming Fundamentals (Technical): C Fundamentals
  5. Data Structures (Technical): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  6. Algorithms (Technical): Algorithm Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Time Complexity Analysis, Advanced Algorithms
  7. OOPs (Technical): Object Oriented Programming (OOPS)
  8. DBMS (Technical): 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
  9. SQL (Technical): SQL
  10. Operating Systems (Technical): 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
  11. Computer Networks (Technical): 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
  12. Software Engineering (Technical): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  13. Coding/Automata Round: Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir, Pseudo Codes
  14. Personality / Behavioral Assessment: Behavioral Assessment (Behavioral Competency Profiling) (Psychometric Test)
  15. Writing Assessment: English Writing Ability
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.

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