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L1 cache and L2 cache
Most of the computer processors we used today are in multiple levels of memory caching. Each of the memory cache level increases in size as it gets further away from the processor. The purpose of cache is alleviate bottleneck occurs. L1 cache is faster than L2 cache. It is range in size from 8KB to 64KB. It use the high-speed SRAM (static RAM) instead of the slower and cheaper DRAM (dynamic RAM) used for main memory. L2 cache is between L1 cache and RAM. It is bigger than L1 cache. It is typically in size 64KB to 4MB. The farther the electricity has to flow inside the computer, the longer it takes. L1 and L2 cache are closer to the CPU, so they are usually used to store data that is needed. CPU will be given priority to L1 cache to look for what it needs first. If it does not find the requested data, it goes to L2. It will go to main memory if the requested data is not in L2. So, the conclusion is the bigger and faster the cache memory, the better the performance. Computer performance however depends on a large number of factors that includes the cache memory to a small limit. Considering most modern processors have almost the same amount of cache and the main performance is determined mostly by other factors such as clock speed, number core, hyper threading.
补充内容 (2013-7-11 02:50 PM):
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楼主: nishini
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