Computer Software


Operating System: Virtual Storage



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Operating System: Virtual Storage

  • Program A
  • Lines 1, 2, 3
  • Program C
  • Lines 52-80
  • Program B
  • Lines 7, 8, 9
  • Program A
  • Program B
  • Program C
  • Primary memory
  • Secondary storage (disk)
  • Virtual storage is based on the fact that. In general, only a few
  • statements in a program can be actually utilized at any given moment

Operating System: Time Sharing

  • Time sharing => an operating system capability that allows many users to share computer processing resources simultaneously.
  • It differs from multiprogramming in that the CPU spends a fixed amount of time on one program before moving to another .
  • In time sharing environment, thousands of users are each allocated a tiny slice of computer time (2 milliseconds).
  • In this time slot, each user is free to perform any required operations.
  • At the end of this period, another user is given a 2-millisecond time slice of the CPU.
  • This arrangement permits many users to be connected to a CPU simultaneously.
  • Because the CPU is operating at the nanosecond level, a CPU can accomplish a great deal of work in 2 millisecond.

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