https:\/\/redis.io\/topics\/lru-cache<\/p>Redis LRU algorithm is not an exact implementation. This means that Redis is not able to pick the best candidate<\/em> for eviction, that is, the access that was accessed the most in the past. Instead it will try to run an approximation of the LRU algorithm, by sampling a small number of keys, and evicting the one that is the best (with the oldest access time) among the sampled keys.<\/cite><\/blockquote>\n\n\n\n\u65e2\u7136\u7b97\u6cd5\u8fd9\u4e48\u7b80\u5355\u4e3a\u4ec0\u4e48Redis\u7684\u9ed8\u8ba4\u5b9e\u73b0\u4e0d\u53bb\u505a\u4e25\u683c\u7684LRU\u5462\uff1f\u5176\u5b9e\u539f\u56e0\u5f88\u7b80\u5355\uff0c\u4e3a\u4e86\u8282\u7701\u7a7a\u95f4\u3002\u5728\u4f20\u7edf\u7684\u65f6\u95f4\u548c\u7a7a\u95f4\u590d\u6742\u5ea6\u91cc\u9762\uff0c\u6240\u6709\u7684\u975e\u6307\u6570\u7ea7\u7684\u589e\u957f\u90fd\u88ab\u5f52\u7eb3\u6210\u4e00\u4e2a\u7ed3\u679c\u3002\u6bd4\u5982\u8bf4O(N) \u548c O(2n)\uff0c\u6216\u8005\u66f4\u5938\u5f20\u7684O(100N)\u6216\u8005\u66f4\u591a\u3002\u8fd9\u5728\u5b9e\u9645\u4e2d\u80fd\u662f\u4e00\u6837\u7684\uff1f\u4f7f\u7528double\u7684\u7a7a\u95f4\uff0c\u82b1\u8d39double\u7684\u65f6\u95f4\uff0c\u518d\u600e\u4e48\u8bf4\u4e5f\u4e0d\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n
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\u7406\u60f3\u548c\u73b0\u5b9e\u7684\u5dee\u8ddd - Redis\u7684\u8fd1\u4f3cLRU - Liangqi\u2018s Technical Journey<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/liangqi.org\/?p=24\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7406\u60f3\u548c\u73b0\u5b9e\u7684\u5dee\u8ddd - Redis\u7684\u8fd1\u4f3cLRU - Liangqi\u2018s Technical Journey\" \/>\n<meta property=\"og:description\" content=\"\u6700\u8fd1\u770b\u4e00\u4e9b\u7b97\u6cd5\u9898\uff0c\u5404\u79cd\u65f6\u95f4\u590d\u6742\u5ea6\uff0c\u7a7a\u95f4\u590d\u6742\u5ea6\u5145\u65a5\u8111\u6d77\u3002O(N), O(N^2), O(NLogN)\u3002\u8fd9\u91cc\u62ffLRU(Least Recently Used)\u7b97\u6cd5\u6765\u4e3e\u4e00\u4e2a\u4f8b\u5b50\u7b97\u6cd5\u548c\u5b9e\u9645\u7684\u5dee\u522b\u3002 \u8fd9\u4e2a\u662fLeetcode\u91cc\u9762\u7684\u7b97\u6cd5: https:\/\/leetcode.com\/problems\/lru-cache\/. \u6ca1\u6709\u5174\u8da3\u7684\u4eba\u5176\u5b9e\u4e5f\u4e0d\u7528\u770b\uff0c\u57fa\u672c\u4e0a\u5c31\u662f\u8bbe\u8ba1\u4e00\u4e2aLRU\u7b97\u6cd5\uff0c\u4fdd\u8bc1\u8bfb\u53d6\u548c\u63d2\u5165\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u90fd\u662fO(N). \u4ee3\u7801\u57fa\u672c\u4e0a\u4e5f\u5c31100\u884c\u5de6\u53f3\uff0c\u8c8c\u4f3c\u5f88\u7b80\u5355\u3002\u4f46\u662f\u5982\u679c\u770bRedis\u7684\u6587\u6863\u6211\u4eec\u4f1a\u53d1\u73b0\u8fd9\u6bb5\u8bdd\uff1a https:\/\/redis.io\/topics\/lru-cache Redis LRU algorithm is not an exact implementation. 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This means that Redis is not able to pick the best candidate for eviction, that is, the access that was accessed the most in the past. 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