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Memory Management in operating system

Posted on December 5, 2021December 5, 2021 By christo No Comments on Memory Management in operating system

The main memory is central to the operation of a modern computer system. Main memory is a large array of bytes, ranging in size from hundreds of thousands to billions. Each byte has its own address. Main memory is a repository of quickly accessible data shared by the CPU and I/O devices.

The central processor reads instructions from main memory during the instruction-fetch cycle and both reads and writes data from main memory during the data-fetch cycle (on a von Neumann architecture).

For example, for the CPU to process data from disk, those data must first be transferred to main memory by CPU-generated I/O calls. In the same way, instructions must be in memory for the CPU to execute them.

The operating system is responsible for the following activities in connection with memory management:

  • Keeping track of which parts of memory are currently being used and who is using them
  • Deciding which processes (or parts of processes) and data to move into and out of memory
  • Allocating and deallocating memory space as needed

operating system

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