C-Look Scheduling

Duration: 2 min

This video lesson is available to enrolled students.

Return to /learn/MPPSC-ASSISTANT-PROFESSOR-COMPUTER-SCIENCE-PAPER-2/operating-system/disc-scheduling/look-c-look-algos/asset-c-look-scheduling after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Paper 1 | General Studies: State Wise GK
  3. Paper 1 | Information and Communication Technology: Role of Internet and Web Services, Security in Mobile and Wireless Computing
  4. Paper 1 | Current Affairs: GK- Current Affairs
  5. Paper 2 | Discrete Mathematical Structure: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Probability
  6. Paper 2 | Digital Computer Organization And Architecture: Number System, Number Representation, Sequential Circuits, Combinational Circuit, Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer
  7. Paper 2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  8. Paper 2 | Programming Languages & Object-Oriented Programming Concepts: Java, OOPS with C++, Java Fundamentals, Array, String, IO & References
  9. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  10. Paper 2 | Data Structure And Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Minimum Spanning Trees, Advanced Algorithms
  11. Paper 2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS
  12. Paper 2 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  13. Paper 2 | 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
  14. 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, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization, Enhanced Data Models
  15. Paper 2 | Computer Network And Information Security: Introduction to CN, Data Communication, Application Layer, Hardware basics, Cyber Threats and Malware Attacks, Network Security, 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
  16. Paper 2 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  17. Paper 2 | Current Trends & Technologies: Emerging Tech Trends, Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Planning, Multi Agent Systems, Fuzzy Sets, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms, Artificial Intelligence, Data Warehousing & Mining, Electronic Data Interchange and E-Commerce, Terms & Abbreviations
  18. Paper 2 | Full Length Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a detailed explanation of the C-LOOK disk scheduling algorithm, positioning it within the context of other scheduling methods like SCAN, LOOK, and C-SCAN. The lecture begins by defining C-LOOK through on-screen text, stating that it functions similarly to how LOOK relates to SCAN. Specifically, the disk arm in C-LOOK does not travel to the physical end of the disk; instead, it services the last request in the current direction and then jumps to the last request at the other end. This mechanism is designed to prevent extra delays caused by unnecessary traversal to the disk's physical limits. The instructor then breaks down the pros and cons, noting that C-LOOK offers more uniform wait times and better response times compared to LOOK. However, it incurs higher overhead to find the last request and is generally not recommended for high-load scenarios. The visual aids help clarify these abstract concepts for students.

Chapters

  1. 0:00 – 1:55 00:00-01:55

    The instructor starts by reading the definition of C-LOOK from the slide, emphasizing its relationship to C-SCAN. He then draws a diamond-shaped diagram on the whiteboard to visually connect the four algorithms: SCAN, LOOK, C-SCAN, and C-LOOK, illustrating their structural similarities. Following this, he draws a large circle to represent the disk platter and sketches a line inside it to demonstrate the head movement. He points to the "Advantage" section, highlighting that C-LOOK provides more uniform wait times and better response times compared to LOOK. He then moves to the "Disadvantage" section, explaining that the overhead to find the last request and return to the initial position is higher, making it unsuitable for cases with more load. Throughout the video, he uses hand gestures to emphasize the movement of the disk arm and the logic behind the algorithm's efficiency. He specifically underlines the text regarding overhead and load conditions to stress the limitations of the algorithm in heavy usage scenarios.

The lecture effectively bridges the gap between theoretical definitions and practical visualization. By drawing diagrams and referencing specific slide text, the instructor clarifies how C-LOOK optimizes disk access by avoiding full traversals, while also acknowledging the computational cost involved in managing request boundaries.

Loading lesson…