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          淺論外文翻譯___基于網絡爬蟲的有效URL緩存

          導讀:外文翻譯---基于網絡爬蟲的有效URL緩存
          deoffs between size and speed. For instance, in a typical workstation there is a very **all but very fast on-chip memory, a larger but slower RAM memory, and a very large and much slower disk memory. In a work environment, the hierarchy continues with work accessible storage and so on. Caching is the idea of storing frequently used items from a slower memory in a faster memory. In the right circumstances, caching greatly improves the performance of the overall system and hence it is a fundamental technique in the design of operating systems, discussed at length in any standard textbook [21, 37]. In the web context, caching is often mentioned
          in the context of a web proxy caching web pages [26, Chapter 11]. In our web crawler context, since the number of visited URLs bees too large to store in main memory, we store the collection of visited URLs on disk, and cache a **all portion in main memory.
          Caching terminology is as follows: the cache is memory used to store equal sized atomic items. A cache has size k if it can store at most k items.1 At each unit of time, the cache receives a request for an item. If the requested item is in the cache, the situation is called a hit and no furt
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