Basic CS-Operating System [3i Infotech Placement]: Sample Questions 7 - 8 of 89

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Question 7

Operating System
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Describe in Detail

Essay▾

What is SMP?

Explanation

Understanding of Symmetric Multiprocessor System
  • SMP is a multi-processing system where multiple processors share common operating system and memory.
  • Processors also share disk input/output resources.
  • The processors also share memory and the I/O bus or data path.
  • OS manages scheduling on all the processors- combines power of multiple processors to complete a process.
  • Primarily used in resource intensive computing environments.
  • Multiple Processors Are Transparent to the User

    • These processor share main memory and I/O facilities.
    • All processors can perform the same functions.

Advantages of SMP

  • Performance:
    • Allows parallel processing
  • Availability:
    • Failure of a single processor does not stop computing.
  • Incremental growth:
    • Additional processors can be added.

Question 8

Operating System
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Describe in Detail

Essay▾

What is a drawback of MVT?

Explanation

Understanding of MVT
  • Multiprogramming with a Variable number of Tasks (MVT) was most sophisticated of three configurations of OS/360′s control program (OS)
  • Used on largest machines in the System/360 family.
  • MVT treated not used memory as a single pool from which contiguous “regions” were allocated allowing simultaneous application and systems programs.
  • Scheme more flexible than MFT՚s and in principle used memory efficiently
  • However, memory was liable to fragmentation
  • With no memory relocation hardware, memory compaction could not be used to reduce fragmentation.
  • A facility called Rollout/Rollin swaped running job to make memory available to another job.
  • In 1971 the Time Sharing Option (TSO) for use with MVT was added as part of release 20.1.

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