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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
          eoretical limits: clairvoyant caching and infinite cache. We performed about 1,800 simulations using these algorithms with various cache sizes, using actual log data extracted from a massive 33 day web crawl that issued over one billion HTTP requests. Our main conclusion is that caching is very effective – in our setup, a cache of roughly 50,000 entries can achieve a hit rate of almost 80%. Interestingly, this cache size falls at a critical point: a substantially **aller cache is much less effective while a substantially larger cache brings little additional benefit. We conjecture that such critical points are inherent to our problem and venture an explanation for this
          phenomenon.
          1. INTRODUCTION
          A recent Pew Foundation study [31] states that “Search engines have bee an indispensable utility for Inter users” and estimates that as of mid-2002, slightly over 50% of all Americans have used web search to find information. Hence, the technology that powers web search is of enormous practical interest. In this paper, we concentrate on one aspect of the search technology, namely the process of collecting web pages that eventually constitute the search engine corpus.
          Search engines collect
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