Question
Download Solution PDFCalculate the page faults, if 5 number of frames are required to get the following sequence of page references : 13, 18, 12, 13, 19, 11, 16, 13, 18, 19, 13, 16, 12, 11, 13 (15 numbers of sequence given) according to FIFO page replacement and LRU :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 2: FIFO incurs two more page faults than LRU
Key Points
Given:
- Page reference sequence = 13, 18, 12, 13, 19, 11, 16, 13, 18, 19, 13, 16, 12, 11, 13
- Number of frames = 5
FIFO (First-In-First-Out):
Page faults occur when a page is not found in the memory and must be brought in. FIFO replaces the oldest page first.
FIFO Page Fault Count: 10
LRU (Least Recently Used):
In LRU, the page that hasn’t been used for the longest time is replaced.
LRU Page Fault Count: 8
Hence:
- FIFO incurs two more page faults than LRU.
Additional Information
- Page Replacement Algorithms are crucial in Operating Systems to manage memory effectively.
- FIFO is simple but may lead to Belady’s anomaly.
- LRU is more efficient as it replaces the least recently used page, usually resulting in fewer page faults.
Therefore, the correct answer is: option 2: FIFO incurs two more page faults than LRU
Last updated on Jul 3, 2025
-> NIELIT Scientific Assistant answer key 2025 has been released at the official website.
-> NIELIT Scientific Assistant admit card 2025 has been released.
-> NIELIT Scientific Assistant city intimation slip 2025 has been released at the official website.
-> NIELIT Scientific Assistant exam 2025 is scheduled to be conducted on June 28.
-> A total number of 113 revised vacancies have been announced for the post of Scientific Assistant in Computer Science (CS), Information Technology (IT), and Electronics & Communication (EC) streams.
-> Online application form, last date has been extended up to from 17th April 2025.
->The NIELT has revised the Essential Qualifications for the post of Scientific Assistant. Candidates must possess (M.Sc.)/ (MS)/ (MCA) / (B.E.)/ (B.Tech) in relevant disciplines.
-> The NIELIT Scientific Assistant 2025 Notification has been released by the National Institute of Electronics and Information Technology (NIELIT).