Consider a system with page size p and average process size m and size of each page table entry is e. What is the amount of space required by page table ? 

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  1. me/p 
  2. mp/e
  3. mpe 
  4. pe/m

Answer (Detailed Solution Below)

Option 1 : me/p 
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The correct answer is me/p.

Key Points

  • The page table is a data structure used in computer operating systems to manage the mapping between virtual addresses and physical addresses.
  • Each entry in the page table corresponds to a page in the virtual memory and contains information about the physical memory location of that page.
  • The size of the page table depends on the number of pages in the process and the size of each page table entry.
  • Given:
    • Page size (p)
    • Average process size (m)
    • Size of each page table entry (e)
  • To calculate the number of pages, divide the average process size by the page size: m/p
  • To find the total space required by the page table, multiply the number of pages by the size of each page table entry: (m/p) * e
  • Simplifying the expression gives the total space required as me/p

Additional Information

  • The page table allows the operating system to efficiently manage memory allocation and ensure that processes do not interfere with each other's memory.
  • Modern operating systems use hierarchical or multi-level page tables to optimize memory usage and reduce the size of page tables for large address spaces.
  • Page tables also play a crucial role in implementing virtual memory, allowing systems to use disk space to extend the available physical memory.

Latest NIELIT Scientific Assistant Updates

Last updated on Feb 20, 2025

-> 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).

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