OS Caching

Traditional LRU file caching doesn't work well with multimedia files only because of that the access patterns for movies are different from those of the text files.

The basic concept/idea behind the traditional LRU buffer caches is that after a block is used, it should be kept in the cache when it is needed again quickly with multimedia system, the general access pattern is that a movie is viewed from beginning to end sequentially.

Unlikely, a block is to be used a second time unless the user rewinds the movie to see some scene again.

Consequently, the normal caching techniques don't work. However, caching can still help, but only if used differently.

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