First Fit in OS (Operating System)

May 24, 2021

First fit algorithm in OS

First Fit in Operating System

The operating system uses different memory management schemes to optimize resource allocation. The responsibility of these schemes is to allocate memory chunks based on the demand by the operating system. The three most commonly used allocation schemes are first to fit, best fit, and worst fit.

The operating system uses different memory management schemes to optimize resource allocation. The responsibility of these schemes is to allocate memory chunks based on the demand by the operating system. The three most commonly used allocation schemes are first to fit, best fit, and worst fit.

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The first fit memory allocation scheme checks the empty memory block in a sequential manner. This means that the memory block found empty at the first attempt is checked for size; if the size is not less than the required size, it is allocated. One of the biggest issues in this memory allocation scheme is, when a process is allocated to a comparatively larger space than needed, it creates huge chunks of memory space.

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First fit algorithm

First fit memory allocation method can be implemented using the following algorithm.

Algorithm:
  • Step 1.Get the number of process and number of blocks.
  • Step 2.Get the size of each block.
  • Step 3. Allocate process  If (size of the block > = size of the process)
    //allocate the process
    else
    //move on to the next blog
  • Step 4.Display the process with the blocks allocated to a respective process
  • Step 5.Stop

 

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Operating systems Memory

      Read More

  1. Memory Management Introduction
  2. Partition Allocation Method
    1. First Fit in OS
      1. Program in C | C++ | Java | Python
    2. Best fit
      1. Program in C | C++ | Java | Python
    3. Worst fit
      1. Program in C | C++ | Java | Python
    4. Next fit
      1. Program in C | C++ | Java | Python
    5. First fit best fit worst fit in OS Example
  3. Buddy- System Allocator
  4. Paging
    1. Types of Paging
  5. Fragmentation
    1. internal fragmentation
    2. external fragmentation
    3. internal fragmentation vs external fragmentation
  6. Mapping Virtual address to Physical Address.
  7. Virtual Memory 
  8. Demand Paging
  9. Implementation of Demand paging and page fault
  10. Segmentation
  11. Page Replacement Algorithms
    1. LRU
    2. FIFO
    3. Optimal Page Replacement algorithm
  12. Thrashing
  13. Belady’s Anomaly
  14. Static vs Dynamic Loading
  15. Static vs Dynamic Linking
  16. Swapping
  17. Translational Look Aside Buffer
  18. Process Address Space
  19. Difference between Segmentation and Paging
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