Computer Organisation and Architecture - Vol 3 | 21. Page Frame Allocation and Thrashing by Abraham | Learn Smarter
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21. Page Frame Allocation and Thrashing

The chapter focuses on paging, specifically discussing frame allocation strategies and the problems associated with thrashing. It elaborates on different allocation schemes such as fixed and proportional allocation, and how priority-based allocation can impact performance. Additionally, it introduces the concept of thrashing, its causes, and the working set model to manage memory effectively.

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Sections

  • 21.1

    Computer Organization And Architecture: A Pedagogical Aspect

    This section discusses the strategies of page frame allocation, thrashing, and their impact on computer performance.

    Learning Practice

  • 21.1.1

    Page Frame Allocation And Thrashing

    This section discusses the concepts of page frame allocation and thrashing in computer memory management, highlighting the significance of proper frame allocation for optimal process performance.

    Learning Practice

  • 21.2

    Concept Of Paging

    This section covers the concept of paging in computer architecture, focusing on page frame allocation and thrashing.

    Learning Practice

  • 21.2.1

    Page Replacement Algorithms

    This section explores various page replacement algorithms, aiming to optimize paging performance in computer systems.

    Learning Practice

  • 21.2.2

    Page Buffering

    Page buffering is a technique used to enhance memory management by minimizing wait times during page replacement.

    Learning Practice

  • 21.2.3

    Dirty Pages Management

    This section discusses the management of dirty pages in computer memory and the strategies for frame allocation to optimize performance.

    Learning Practice

  • 21.3

    Frame Allocation Schemes

    This section explores various frame allocation schemes in memory management, focusing on their impact on process performance and the prevention of thrashing.

    Learning Practice

  • 21.3.1

    Minimum Frame Allocation

    The section discusses minimum frame allocation strategies to optimize memory usage across processes, including fixed and proportional allocation types, while addressing potential issues like thrashing.

    Learning Practice

  • 21.3.2

    Allocation Schemes Types

    This section discusses various frame allocation schemes in computer systems, focusing on fixed, proportional, and priority-based allocation, along with local and global replacement strategies.

    Learning Practice

  • 21.3.3

    Fixed Allocation Scheme

    This section explains the fixed allocation scheme for memory frame allocation, including both equal and proportional allocation methods, their benefits, drawbacks, and the importance of allocating a minimum number of frames to prevent thrashing.

    Learning Practice

  • 21.3.4

    Proportional Allocation Scheme

    The section discusses the proportional allocation scheme in computer memory management, emphasizing how it distributes frames among processes based on their sizes to optimize performance.

    Learning Practice

  • 21.3.5

    Priority-Based Allocation

    This section discusses frame allocation strategies in computer systems, specifically fixed allocation and priority-based allocation schemes, including the importance of allocating sufficient frames to processes for optimal performance.

    Learning Practice

  • 21.4

    Global Vs Local Frame Allocation

    This section discusses the concepts of global and local frame allocation in memory management, highlighting their differences and implications for process performance.

    Learning Practice

  • 21.4.1

    Local Frame Allocation

    This section discusses local frame allocation strategies in memory management, focusing on how processes are allocated frame resources to optimize performance while minimizing page faults.

    Learning Practice

  • 21.4.2

    Global Frame Allocation

    This section discusses global frame allocation strategies in memory management, particularly the need for minimum frame allocation per process to optimize performance and prevent thrashing.

    Learning Practice

  • 21.4.3

    Priority-Based Scheme In Frame Allocation

    This section discusses the various allocation schemes for page frames in memory management, focusing on priority-based allocation to enhance performance.

    Learning Practice

  • 21.5

    Thrashing

    Thrashing occurs when a process spends more time swapping pages than executing instructions, leading to poor system performance.

    Learning Practice

  • 21.5.1

    Definition And Impact Of Thrashing

    Thrashing is a condition where a computer's performance degrades due to excessive page-faults when a process does not have enough memory pages loaded.

    Learning Practice

  • 21.5.2

    Cause And Effects Of Thrashing

    This section describes thrashing, its causes within process execution in computing systems, and the consequent effects on CPU utilization and overall system performance.

    Learning Practice

  • 21.5.3

    Solutions To Thrashing

    This section explores the phenomenon of thrashing in computing, its causes, and various strategies to mitigate its impact.

    Learning Practice

  • 21.6

    Working Set Model

    The Working Set Model describes how processes manage memory and reduce page faults by focusing on the set of pages actively used during execution.

    Learning Practice

  • 21.6.1

    Working Set Window And Its Importance

    The section explains the concept of the working set window in computer memory management, emphasizing its importance in optimizing page allocation and preventing thrashing.

    Learning Practice

  • 21.6.2

    Monitoring Page-Fault Frequency

    This section discusses techniques for managing page faults in computer systems, focusing on the importance of monitoring page-fault frequency.

    Learning Practice

References

34 part a.pdf

Class Notes

Memorization

What we have learnt

  • The importance of frame all...
  • The distinction between fix...
  • The definition and implicat...

Final Test

Revision Tests