Computer Organisation and Architecture - Vol 3 | 18. Page Replacement Algorithms by Abraham | Learn Smarter
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18. Page Replacement Algorithms

The chapter extensively explores the design and management of cache memory, focusing on virtually indexed and physically tagged cache mechanisms, along with various page replacement strategies. It highlights the trade-offs involved in cache indexing methods, such as issues with cold misses during context switches and the synonym problem in set-associative caches. The chapter also delves into efficient page replacement algorithms, using examples like FIFO and LRU while addressing practical challenges in their implementation.

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Sections

  • 18.1

    Computer Organization And Architecture: A Pedagogical Aspect

    This section discusses page replacement algorithms and memory management techniques in computer architecture, focusing on cache access strategies.

    Learning Practice

  • 18.2

    Page Replacement Algorithms

    This section discusses various page replacement algorithms utilized in operating systems to manage memory effectively.

    Learning Practice

  • 18.2.1

    Recap Of Last Class

    This section recapitalizes the key points from the previous class on cache structures and their efficiency in virtual memory operations.

    Learning Practice

  • 18.2.2

    Virtually Indexed Physically Tagged Caches

    This section explains the concept of virtually indexed physically tagged caches, discussing their advantages over other cache indexing methods and the implications of using virtual addresses for cache management.

    Learning Practice

  • 18.2.3

    Virtually Indexed Virtually Tagged Caches

    This section discusses the concepts and challenges of virtually indexed virtually tagged (VIVT) caches and their relationship to TLBs and context switching.

    Learning Practice

  • 18.2.4

    Context Switch And Cold Misses

    This section discusses the effects of context switching on cache performance, particularly focusing on cold misses caused by using virtually indexed and tagged cache systems.

    Learning Practice

  • 18.2.5

    Synonym Problem

    This section delves into the synonym problem encountered in virtual memory systems, illustrating the challenges associated with cache management in multiple processes.

    Learning Practice

  • 18.2.6

    Page Colouring

    This section discusses page colouring as a method to efficiently manage cache memory in systems using virtual memory.

    Learning Practice

  • 18.2.7

    Page Replacement And Belady's Anomaly

    This section covers the concepts of page replacement in operating systems, highlighting Belady's Anomaly and its significance.

    Learning Practice

  • 18.2.8

    Different Page Replacement Policies

    This section discusses various page replacement policies, focusing on their mechanics and implications in memory management.

    Learning Practice

  • 18.2.8.1

    First In First Out (Fifo)

    The FIFO algorithm is a basic page replacement strategy where the oldest page in memory is removed when a new page needs to be loaded.

    Learning Practice

  • 18.2.8.2

    Optimal Replacement Policy

    This section discusses optimal page replacement policies used in virtual memory systems, focusing on theoretical significance and comparative efficiency.

    Learning Practice

  • 18.2.8.3

    Least Recently Used (Lru)

    The Least Recently Used (LRU) page replacement algorithm optimally replaces pages in memory based on their usage history, focusing on minimizing page faults.

    Learning Practice

References

33 part a.pdf

Class Notes

Memorization

What we have learnt

  • The advantages and disadvan...
  • The impact of page replacem...
  • The synonym problem in cach...

Final Test

Revision Tests