Why are computers equipped with multiple layers of cache? Would it not be better to simply...
Why are computers equipped with multiple layers of cache? Would it not be better to simply have one big one? (Answer in 3-4 line, 2 points)
Homework Answers
Key Points
- Each bit in a cache is made up of transistors if we want to increase the size of the cache we have to increase the number of transistors.
- By increasing the number of transistors, it makes the cache physical size bigger.
- Bigger the size, bigger will be the distance from the ALU.
- As the distance from the processor increases the speed of the cache decreases.
- Thus two or more caches are required.
- L1 (Primary cache) - smaller in size, nearer to the CPU, low in capacity but faster in speed.
- L2 (Secondary cache) - bigger in size, near to the CPU, having a high capacity but slower.
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