Basics of Space Allocation in Contiguous Allocation

Duration: 11 min

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Module outline

  1. HPSC Interview Preparation: Interview Preparation
  2. Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  3. Data Structure & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Sorting Algorithms, Minimum Spanning Trees, Time Complexity Analysis, Graph Theory, Shortest Path Algos
  4. Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security
  5. Computer System & Organisation: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer
  6. Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, SQL, File Organization & Indexing, Transaction Management, Concurrency Control
  7. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling
  8. Digital Logic & Circuits: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  9. Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Pushdown Automata & CFG, Turing Machines, Moore & Mealy Machines
  10. Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  11. Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, Data Warehousing & Mining
  12. Introduction to Emerging Trends: Emerging Tech Trends, Number System & Place Value, Marketing and Consumer Studies, कंप्यूटर नेटवर्क / Computer Networks
  13. Digital Society & Cyber Law: Society, Law & Ethics, साइबर सुरक्षा / Cyber Safety and Security
  14. HPSC PGT Previous Year Paper:
  15. HPSC Assistant Professor Previous Year Paper:
  16. Live Sessions: HPSC Live Sessions, EMRS TGT/PGT Live Class
  17. Full Mock Test:
  18. HPSC PGT - MOCK Test Series:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video lecture provides a detailed explanation of memory allocation strategies in operating systems, specifically focusing on contiguous allocation methods. The session begins by defining the 'First fit policy,' outlining its mechanism of searching memory from the base to allocate the first capable partition, and listing its pros and cons. The lecture then transitions to 'Variable size partitioning,' where the instructor uses hand-drawn diagrams to illustrate how memory is treated as a single chunk and dynamically divided based on process requests, ensuring remaining space is reused. Finally, the concept of 'Fixed size partitioning' is introduced, highlighting the issue of internal fragmentation when a process is smaller than its allocated partition. Visual analogies involving tables of different shapes and sizes are used to clarify these abstract concepts.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a slide titled 'First fit policy'. The text defines the policy as searching memory from the base to allocate the first partition capable enough. Bullet points list advantages such as being 'simple, easy to use, easy to understand' and disadvantages like 'poor performance, both in terms of time and space'. The instructor stands to the side, gesturing towards the text to emphasize these points.

  2. 2:00 – 5:00 02:00-05:00

    The slide changes to 'Space Allocation Method in Contiguous Allocation' focusing on 'Variable size partitioning'. The text explains that memory is treated as a whole chunk initially. The instructor draws a long horizontal rectangle representing memory, labeling it '100'. He draws vertical lines to partition it into segments and writes numbers below: '15', '40', '25', '20', '20'. He explains that exactly the requested space is allocated if possible, and the remaining space is reused.

  3. 5:00 – 10:00 05:00-10:00

    The instructor uses a visual analogy with tables to explain sizing. A slide shows 'Circle' tables with capacities 2, 4, 8, 10 and 'Rectangle' and 'Square' tables with capacities 6, 2, 4. The slide then switches to 'Fixed size partitioning'. The text states memory is divided into fixed size partitions, and remaining space is wasted internally. The instructor draws a row of fixed rectangles, marks one with hatched lines, and writes '10' (partition size) and '9' (process size) to demonstrate internal fragmentation.

  4. 10:00 – 10:39 10:00-10:39

    The video concludes with the instructor summarizing the concepts. The slide briefly reverts to the 'First fit policy' content, reinforcing the initial topic. The instructor gestures with his hands, wrapping up the lecture on memory allocation strategies and ensuring students understand the distinction between variable and fixed partitioning methods.

The lecture systematically builds understanding of memory management by contrasting dynamic and static allocation strategies. It starts with a specific algorithm (First Fit), moves to the broader concept of variable partitioning with visual examples of memory fragmentation, and concludes with fixed partitioning and its inherent inefficiency (internal fragmentation). The use of analogies (tables) and hand-drawn diagrams reinforces the theoretical concepts, providing a clear visual progression from simple definitions to complex allocation scenarios.

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