Thrashing

Duration: 4 min

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Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
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  10. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits
  11. Paper-2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Linux OS, Distributed Systems
  12. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  13. Paper-2 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  15. Paper 2 | Oops, C++, Java: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
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  17. Paper 2 | Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  18. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Advanced Algorithms
  19. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, 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, Ethical Hacking
  20. Paper-2 I Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  21. Paper-2 | Computer Organization and Architecture: Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations
  22. Paper-2 | Web Development: JavaScript-Basics, HTML Basics, CSS, XML
  23. Pedagogy: Child Development, Concept of Pedagogy, Psychology, Theories, Inclusive Education, Experiential Pedagogy, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
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  26. RSSB Paper 2 - Full Mock Tests:
  27. SCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a detailed explanation of 'Thrashing' within the context of operating systems. The instructor, Sanchit Jain from Knowledge Gate Educator, utilizes a presentation slide featuring a specific definition and a graphical representation to illustrate the phenomenon. The central theme revolves around the relationship between CPU utilization and the degree of multiprogramming. The slide explicitly defines thrashing as a state where a process spends more time paging than executing. The graph serves as a visual aid to demonstrate how system performance degrades when the degree of multiprogramming exceeds a certain threshold, leading to high paging activity and reduced CPU efficiency.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The session begins with the instructor introducing the concept of thrashing. The slide text is clearly visible, stating, 'A process is thrashing if it is spending more time paging than executing. High paging activity is called Thrashing.' The instructor stands beside a graph plotting 'CPU utilization' against the 'degree of multiprogramming.' He starts by explaining the initial positive correlation where increasing the number of processes improves CPU usage. To illustrate this progression, he physically draws tick marks on the x-axis of the graph, writing the numbers '1, 2, 3' sequentially. He uses hand gestures to trace the upward slope of the curve, indicating that as more processes are added, the CPU becomes busier and utilization rises.

  2. 2:00 – 3:34 02:00-03:34

    The instructor continues his explanation by extending the x-axis markings to include '4, 5, 6, 7, 8, 9'. He points specifically to the peak of the curve, identifying it as the optimal point for multiprogramming. He then shifts focus to the sharp decline in the graph that occurs after this peak. He explains that once the degree of multiprogramming goes beyond a certain limit (around 6 or 7), the system enters a state of thrashing. To emphasize this critical transition, he draws a red cross or line over the dropping section of the curve. He clarifies that in this region, the CPU utilization drops drastically because the system is overwhelmed with paging activity, spending more time moving data between memory and disk than actually executing instructions.

The lecture successfully bridges the gap between abstract definitions and practical system behavior. By combining the textual definition of thrashing with the graphical drop in CPU utilization, the instructor clarifies that simply adding more processes does not always improve performance. Instead, there is a critical threshold; exceeding it leads to thrashing, where the system becomes inefficient due to excessive paging, resulting in a significant drop in CPU utilization.

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