Priority Scheduling Advantage Vs Disadvantage

Duration: 6 min

This video lesson is available to enrolled students.

Return to /learn/MPPSC-ASSISTANT-PROFESSOR-COMPUTER-SCIENCE-PAPER-2/operating-system/cpu-scheduling/priority-scheduling/asset-priority-scheduling-advantage-vs-disadvantage 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 lecture, presented by Sanchit Jain Sir from Knowledge Gate Educator, delves into the Priority Scheduling algorithm within Operating Systems. The session systematically breaks down the pros and cons of this scheduling method before introducing a specific technique to mitigate its primary drawback. The instructor utilizes a digital whiteboard to display bullet points, which he annotates with checkmarks and circles to emphasize critical concepts for students preparing for exams like GATE. The content is structured to first establish why the algorithm is useful, then identify its flaws, and finally present a standard solution used in real-world systems.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The lecture begins by outlining the benefits of Priority Scheduling. The slide titled Advantage displays two main points: Gives a facility specially to system process and Allow us to run important process even if it is a user process. The instructor explains that this algorithm is particularly useful because it ensures that critical system tasks or high-priority user applications are executed first, preventing them from being delayed by less important background tasks. He gestures towards the text to reinforce that this flexibility is a key strength of the method, allowing the OS to manage resources efficiently based on importance.

  2. 2:00 – 5:00 02:00-05:00

    The discussion shifts to the downsides of the algorithm on a slide titled Disadvantage. The text highlights that Here process with the smaller priority may starve for the CPU and notes there is No idea of response time or waiting time. The instructor underlines these phrases to stress the severity of the issue. He elaborates on the concept of starvation, where low-priority processes might wait indefinitely if high-priority processes continuously arrive, effectively starving the lower-priority ones of CPU time. He also points out the unpredictability of waiting times for users, making it difficult to guarantee service levels for all processes in the system.

  3. 5:00 – 5:44 05:00-05:44

    To resolve the starvation issue, the instructor introduces a solution called Ageing. The slide defines it as a technique of gradually increasing the priority of processes that wait in the system for long time. An example is provided: E.g. priority will increase after every 10 mins. The instructor circles the term Ageing and the time interval 10 mins to highlight the mechanism. He explains that by incrementally raising the priority of waiting processes, the system ensures that even low-priority tasks eventually get executed, thus preventing indefinite starvation. This technique effectively balances the need for high-priority execution with fairness for all processes.

The lecture provides a comprehensive overview of Priority Scheduling, moving logically from its utility in prioritizing critical tasks to the significant risk of starvation it poses. By introducing Ageing as a countermeasure, the instructor offers a complete picture of how modern operating systems manage process priorities effectively. This progression helps students understand not just the algorithm itself, but also the practical engineering solutions used to handle its inherent limitations, ensuring a balanced approach to CPU resource allocation.

Loading lesson…