Operating System [3i Infotech Placement]: Sample Questions 64 - 65 of 81

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Question 64

Operating System
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Describe in Detail

Essay▾

What is a Map?

Explanation

Understanding of Mapping in Memory
  • A map is an array containing the address of the free space in the swap device- allocable resources, and a count of number of the resource units available there.
  • Allows allocation of contiguous blocks of a resource.
  • Contains only one entry address and the total number of resources.
  • Kernel treats every unit of map a group of disk blocks.

A Map is also:

  • Utility to map texts from and to Unicode.
  • Or to map text from one character set representation to another.
  • An older utility for this purpose was record- unfortunately record does not support Unicode and eastern character sets.

Question 65

Operating System
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Describe in Detail

Essay▾

What is an advantage of executing a process in background?

Explanation

Executing a Process in Background
  • The most common reason to put a process in the background is to do something else interactively without waiting for the process to complete.
  • This is done by adding a special background symbol, & at end of the command.
  • Tells the shell to execute the given command in the background.
  • Example:
    • cp ⚹ . ⚹ . . / backup& (cp is for copy) .

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