Question
Which of the following page replacement algorithms is
considered optimal and aims to minimize the number of page faults?Solution
The Optimal Page Replacement algorithm is recognized as the best theoretical page replacement strategy as it aims to minimize page faults by replacing the page that will not be used for the longest period in the future. This algorithm requires knowledge of future requests, making it impractical for real-world use, but it serves as a benchmark against which other algorithms are compared. In essence, the optimal algorithm reduces the number of page faults to a minimum because it makes decisions based on the best possible future outcome. In situations where a system employs this strategy, it effectively reduces overhead caused by frequent page faults, enhancing the overall performance of memory management. While it is ideal for academic discussions and theoretical models, its impracticality stems from the necessity of predicting future requests, which is often unfeasible in dynamic and unpredictable real-world environments. Option A (FIFO) - FIFO is simple and easy to implement, but it does not necessarily minimize page faults effectively. It replaces the oldest page regardless of its future usage. Option B (LRU) - Least Recently Used is a practical alternative that approximates optimal replacement by replacing the least recently accessed pages; however, it may still lead to more page faults than the optimal algorithm. Option D (Second Chance) - This algorithm gives pages that have been used recently another chance before they are replaced but does not guarantee the least number of page faults compared to the optimal method. Option E (Clock) - The Clock algorithm is a variation of Second Chance and improves on FIFO's shortcomings, but it similarly does not achieve the optimality that the optimal page replacement algorithm does.
Which of the following is NOT a common wireless security protocol?
In the context of Data Modelling and Analytics, which technique is most suitable for identifying the underlying patterns in high-dimensional data withou...
In Database Management Systems, what is the primary purpose of normalization?
Which protocol is most commonly used for secure communication between IoT devices over the internet?
Which command is used to undo the changes
Which of the following is NOT a characteristic of the Internet of Things (IoT)?
Which of the following is a fundamental challenge in Natural Language Processing (NLP)?
Which data structure is most suitable for implementing recursion?
Which of the following is substring of “IXAMBEE”?
In a Data Analytics pipeline, which of the following is an advantage of using Dimensional Modelling?