Swappiness

Duration: 7 min

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Module outline

  1. Numerical Ability & Problem Solving: Speed Mathematics and Basic Mathematics, Arithmetic, Number System, HCF LCM, Divisibility Rules, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Mixture and Alligation, Time and Work, Pipe and Cistern, Speed Time and Distance, Age Problems, Partnership, Data Interpretation, Mental Ability, Sequence and Series (Series), Powers and Exponents (Surds and Indices), Algebra, Statistics, Logarithm, Mensuration and Geometry, Permutation and Combination, Probability, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Sentence Structure and Correction, Data Sufficiency, Trigonometry, Measurement and Quantity Take-Off, Signal Space and Optimum Detection, Probability, Statistics, Algebra, Time and Work, Speed, Time and Distance, Data Interpretation, Combinatorics
  2. Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Directions (Direction Test), Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Logical Sequence Of Words, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence, Selection Decision Table (Decision Making), 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, Syllogisms and Venn Diagrams, Critical Reasoning, Order, Ranking and Sequence, Reading Comprehension, Profit, Loss and Discount, Constraint Puzzles, Traverse Surveying, Ratio and Proportion, Mensuration, Permutations and Combinations, Clocks and Calendars, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Vocabulary, Blood Relations
  3. General Knowledge & Current Affairs (India + Rajasthan): History, Geography, Polity, Indian Economy, Static General Knowledge, State Wise GK, GK- Current Affairs, Environment, Physics
  4. Computer Fundamentals & Operating Systems: Basics of COA, Floating Point Rep, Digital Systems & Boolean Basics, Number Representation, Number System, Introduction to OS, File Management, Windows OS, Unix OS, Linux OS, Register Transfer and Microoperations, Virtual Memory
  5. Computer Networks: Introduction to CN, Data Communication, DLL: Error Control, DLL: Access Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Application Layer, Hardware Basics, Network Security
  6. Cyber Security: Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Electronic Data Interchange and E-Commerce, Physical Security and Cryptography Basics, Intrusion Detection Systems (IDS), Cyber Safety and Security, Ethical Hacking
  7. Programming (C & OOP): C Fundamentals, Control Flow, Arrays & Pointers, Functions, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, OOPS with C++, Operators & Expressions, Sorting Algorithms, Java Fundamentals, Java
  8. MS Office & Data Processing: MS Office Applications, Basics of DBMS
  9. Internet & Web Technology: Society, Law & Ethics, Terms & Abbreviations, Keyboard Shortcuts, Emerging Tech Trends, Artificial Intelligence, Emerging Technologies, Internet Fundamentals, Website, Browser & Services, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces Linux memory management and focuses on the Swappiness kernel parameter. The instructor begins with an overview slide listing main components: physical memory, virtual memory, page tables, page cache, memory reclaim, swap, and OOM handling. The lesson then transitions to Swappiness, defined as a kernel parameter controlling the relative tendency to use swap compared with filesystem paging under memory pressure. The parameter is accessed via /proc/sys/vm/swappiness, has a range of 0-200, and defaults to 60. Lower values favor avoiding swap; higher values prefer swapping. A diagram shows OS/main memory and disk swap space connected by “Swapping out” and “Swapping in” arrows. Commands for checking and temporarily changing the value are referenced.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a slide titled “Linux Memory Management Overview,” stating that Linux manages both physical memory (RAM) and virtual memory efficiently. Under “Main Components,” bullets list Physical Memory Management, Virtual Memory, Page Tables, Page Cache, Memory Reclaim, Swap, and OOM Handling. The instructor gestures while explaining the list; red checkmarks appear next to the first five components, visually confirming them before moving on.

  2. 2:00 – 5:00 02:00-05:00

    The slide transitions to “Swappiness,” defined as a Linux kernel parameter controlling the relative tendency to use swap compared with filesystem paging when memory pressure occurs. The on-screen path /proc/sys/vm/swappiness is shown, with the range 0-200 circled in red and “Default value is 60.” noted. Bullets state that lower values generally favor avoiding swap, while higher values give relatively more preference to swapping. A diagram pairs an OS/Main Memory block with a Disk cylinder labeled “Swap Space,” linked by “Swapping out” and “Swapping in” arrows.

  3. 5:00 – 6:49 05:00-06:49

    The Swappiness slide remains on screen, reinforcing the definition and key facts: range 0-200, default 60, lower values avoid swap, higher values prefer swapping. The green path /proc/sys/vm/swappiness is displayed with labels “Check Current Value” and “Temporarily Change,” indicating the commands used to inspect and modify the parameter. The swapping diagram continues to illustrate movement of pages between main memory and swap space on disk.

The lecture builds from a broad overview of Linux memory management to the specific Swappiness parameter. The main components slide establishes context by naming swap among other subsystems, then the instructor narrows focus to Swappiness as a tunable kernel setting. The core definition—relative tendency to use swap versus filesystem paging under memory pressure—is the central concept, supported by the numeric range 0-200 and default of 60. The practical takeaway is that lowering Swappiness makes the kernel reluctant to swap, while raising it encourages swapping. The diagram of main memory and disk swap space with “Swapping out”/“Swapping in” arrows provides a visual model of the process. The file path /proc/sys/vm/swappiness and its associated check/change labels connect the concept to real system administration commands. This progression from overview to definition, tuning range, and practical access forms a coherent study unit on Swappiness.

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