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Computer Science

Define 'Caching'

The process of storing data so it can be quickly retrieved

Why is caching a fast process

Instructions are fetched from cache rather than secondary storage which is slower

Define 'Prefetching'

A process where data is requested from main memory before it is actually needed

Why is prefetching hard to implement

It needs to be created to predict with a high degree of accuracy that an instruction will be needed soon

Give 2 drawbacks of 'Caching'

- If the wrong data is fetched & cached it will have to be flushed which can take up more CPU time
- Maintaining the correct data sequence of instructions/data in these circumstances can be problematic

Give benefits of code reuse

- Saves system resources
- lowers development cost

- reduces redundant code

Give benefits of rotuines

- Already compiled, so they're tested and error free
- Can be used multiple times

- May require fewer developers to work on a program

- Saves work for programmers, reduces development time and cost

What are API's

Where a system is linked to another system & enables other developers to use certain procedures and functions

Define 'Abstraction'

The process of removing any unnecessary information and only focusing on information that is relevant

Give a use of abstraction

Computer games - Use abstraction to remove elements a user doesn't need. The user does not need to know the algorithm of an NPC, they just need to be able to see what it is doing

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