What is multi level cache?

Multi level cache is a type of computer memory hierarchy, which consists of multiple cache levels. In this memory hierarchy, the cache closest or nearest to the processor is referred to as L1 (Level 1) cache, and subsequent caches are designated as L2, L3, and so on.

The primary objective of multi level cache is to increase the speed and performance of the overall system. The L1 cache is typically very fast but relatively small in size, and it stores the most frequently used data or instructions. The L2 cache is larger but slower than the L1 cache, and it stores less frequently used data to minimize the time taken to retrieve the data from the main memory.

In modern processors, multi level cache systems can go up to L3, L4 or beyond. The cache size and capacity differs depending on the processor architecture and design. Multi level cache systems also include additional techniques like prefetching, cache coherence, and snoop filters to improve their efficiency and minimize access times.

Multi level cache system improves the overall performance of the system by minimizing the number of times the processor has to access the main memory. The additional cache levels reduce the memory latency, reduce power consumption, and improve the efficiency of the system. Therefore, multi level cache is an essential component of modern computer processors.