Computer Software


Operating System: Multiprogramming



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Software

Operating System: Multiprogramming

  • Operating
  • System
  • Unused memory
  • Program 1
  • Operating
  • System
  • Unused memory
  • Program 1
  • Program 3
  • Program 2
  • Traditional system with
  • no multiprogramming
  • Multiprogramming
  • environment
  • The first operating systems executed only one program at a time.When a program read data from a tape or disk or wrote data to a printer, the entire CPU came to a stop. This was a very inefficient way to use the computer.
  • In a multiprogramming environment, three programs were stored in primary storage. The first program executes until an input/output statement occurs. Then the operating system directs a channel to read the input and move the output to output device.The CPU moves to the second program until an input/output statement occurs. At this point, the CPU switches to the execution of the third program.

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