Advantages
Demand paging, as opposed to loading all pages immediately:
- Only loads pages that are demanded by the executing process.
- As there is more space in main memory, more processes can be loaded reducing context switching time which utilizes large amounts of resources.
- Less loading latency occurs at program startup, as less information is accessed from secondary storage and less information is brought into main memory.
- As main memory is expensive compared to secondary memory, this technique helps significantly reduce the bill of material (BOM) cost in smart phones for example. Symbian OS had this feature.
Read more about this topic: Demand Paging
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