Operating System-Unix [3i Infotech Placement]: Sample Questions 12 - 13 of 78

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Question 12

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Write in Short

Short Answer▾

In what way the fault handlers and the interrupt handlers are different?

Explanation

  • Fault is associated with an instruction, which was executed, or some operation that it did. For example an instruction loading from memory can cause page fault. Faults are thus synchronous
  • Interrupts on the other hand are asynchronous; they have nothing to do with the executing instruction. For example, a disk can request IO interrupt to get attention of the processor.

Question 13

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Describe in Detail

Essay▾

What is the main goal of the Memory Management?

Explanation

Understanding of Memory Management

Memory Management:

  • Decides the process, which should reside in the main memory.
  • Manages parts of the virtual address space of a process which are non-core resident.
  • Monitors the available main memory and periodically writes the processes into the swap device so that processes fit in the main memory.

Here are some important points on memory management:

  • Unix is machine independent so its memory management scheme varies from one system to another.
  • Early versions of UNIX used variable partitioning with no virtual memory scheme.
  • Process is either in the memory or on the disk.
  • The process is likely to swapped if it is idle, has been in main memory a long time or is large.
  • A process is likely to be swapped in completely if it has been swapped out a long time, or it is small.

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