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5 of the Best Free Linux Caching Systems   
Saturday, April 30 2011 @ 03:53 AM EDT
Contributed by: sde

In computing terms, a cache is a collection of temporary data that will be required to be accessed in the future, and can be retrieved extremely quickly. The data stored within a cache may be a simple reproduction of information held elsewhere or it may have been the results of a previous computation.

Where data stored in the cache is requested, this is known as a cache hit. The advantage of a cache hit is that the request will be served considerably faster. The flipside, a cache miss, occurs when information has to be recalculated or retrieved from its original location, consuming more system resources and slower access. If 20% of data is accessed 80% of the time, and a system can be utilised which reduces the cost and time of obtaining that 20%, system performance will dramatically improve. Fine tuning a system to improve the cache hit rate speeds up overall system performance.

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