First Fit in OS (Operating System)

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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