Distributed Operating System

Duration: 3 min

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Inside: a video lesson and guided study material.

Module outline

  1. English Comprehension: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Reading Comprehension, Vocabulary, Idioms and Phrases, Narrative Sequencing, Critical Reasoning
  2. Reasoning and Aptitude: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Seating Arrangements, Puzzle Solving (Puzzles), Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Sufficiency, Selection Decision Table (Decision Making), Calendar, Clock, Cubes & Dices, Data Arrangement, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning), Number System, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Speed Time and Distance, Mensuration and Geometry, Arithmetic, Mixture and Alligation, Age Problems, Data Interpretation, Alphabet and Word Tests, Numerical Reasoning, Number System, Averages, Mixtures and Alligation, Percentages, Series Completion, Analogy and Classification, Patterns in Two-Dimensional Figures, Coding and Decoding, Mathematical Operations, Direction Sense, Logical Deduction and Induction, Simplification and Approximation, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Algebra, Traverse Surveying, Clocks and Calendars, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Ratio and Proportion, Mensuration, Permutations and Combinations, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Probability, Trigonometry, Measurement and Quantity Take-Off, Statistics, Data Sufficiency, Blood Relations, Speed, Time and Distance, Time and Work, Data Interpretation, Sequence and Series (Series), Algebra, Permutation and Combination, Combinatorics
  3. General Awareness: Physics, Chemistry, Biology, Geography, History, Polity, Indian Economy
  4. Computer Fundamentals: Basics of COA, Number System, Number Representation, Semiconductor Memories and Programmable Logic, Timing, Hazards and Testing, Processor Organization and Instructions, Number Systems and Codes, Combinational Logic Design, Combinational Logic Circuits, Number Systems and Codes
  5. Operating System: Introduction to OS, Unix OS, Linux OS
  6. C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  7. OOPS with C++ & Java: OOPS with C++, Java
  8. Database Management System: Basics of DBMS, SQL
  9. MS Office: MS Office Applications
  10. Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces the fundamental concepts of a Distributed Operating System (OS). The instructor defines it as software running over a collection of independent, networked, and loosely coupled nodes that are physically separate. A key characteristic highlighted is that these nodes do not share memory or a clock; instead, they possess local memory and communicate via networks like high-speed buses or the Internet. The lecture presents an architectural diagram showing distributed applications and services running across multiple machines (Machine A, B, C), each with its own kernel. Finally, the instructor outlines four major reasons for building distributed systems: resource sharing, computation speedup, reliability, and communication, citing examples like Plan 9 and Inferno.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with a slide titled 'Distributed OS'. The instructor reads and underlines the definition: 'A distributed operating system is a software over a collection of independent, networked, communicating, loosely coupled nodes and physically separate computational nodes.' He emphasizes the terms 'independent', 'networked', 'communicating', and 'loosely coupled' by underlining them. To illustrate the concept of nodes communicating, he draws a rough diagram of four squares connected by lines, representing a network topology. He explains that these modes do not share memory or a clock, meaning each node has its own local memory.

  2. 2:00 – 3:20 02:00-03:20

    The instructor moves to the architectural diagram showing 'Machine A', 'Machine B', and 'Machine C'. The diagram displays layers: 'Distributed applications' at the top, 'Distributed operating system services' in the middle, and 'Kernel' at the bottom for each machine, all connected by a 'Network'. He explains that jobs are serviced by multiple CPUs and each node holds a specific software subset. He then lists four major reasons for building distributed systems, underlining 'resource sharing', 'computation speedup', 'reliability', and 'communication'. He concludes this section by mentioning examples such as 'Plan 9 from Bell Labs' and 'Inferno'.

The lecture progresses from a textual definition of a Distributed OS to a visual architectural representation. It establishes that distributed systems consist of physically separate nodes communicating over a network without shared memory. The lesson concludes by justifying the use of such systems through four key benefits: resource sharing, speedup, reliability, and communication, providing historical context with examples like Plan 9.

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