UGC NET CSE | June 2016 | Part 2 | Question: 34

Question

Which of the following is not typically a benefit of dynamic linking?

1. Reduction in overall program execution time
2. Reduction in overall space consumption in memory
3. Reduction in overall space consumption on disk
4. Reduction in the cost of software updates
   • A. I and IV
   • B. I only
   • C. II and III
   • D. IV only

Answer 1

Dynamic linking

A stub is added instead of libraries in executable image. When a library routine is called, original library routine is linked in place of stub. When the same routine is called again routine is executed directly with no dynamic linking. Performed by operating system. DLL takes more time to execute due to overhead of linking. Compatibility issues arise if library changes Also called shared libraries. Smaller executable size

Answer must be B ) I only 

Comments

How 's s/w update cost reduced?

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In static linking in order to update a small part whole executable need to be replaced.

In dynamic linking, in order to update a small part, it is enough to replace existing function with new code. Thus it is cost isreduced