Operating System Interview Question and Answers

55. What are local and global page replacements?
  • Local replacement means that an incoming page is brought in only to the relevant process address space.
  • Global replacement policy allows any page frame from any process to be replaced. The latter is applicable to variable partitions model only.
56. What is cache-coherency?
  • In a multiprocessor system there exist several caches each may containing a copy of same variable A.
  • Then a change in one cache should immediately be reflected in all other caches this process of maintaining the same value of a data in all the caches s called cache–coherency.
57. What are the benefits of multithreaded programming?
  • Responsiveness
  • Resources sharing
  • Economy
  • Utilization of multiprocessor architectures.
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