{"id":201549,"date":"2025-05-10T12:26:41","date_gmt":"2025-05-10T04:26:41","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201549\/"},"modified":"2025-05-10T12:26:41","modified_gmt":"2025-05-10T04:26:41","slug":"redis-%e5%92%8c-memcached-%e7%9a%84%e5%8c%ba%e5%88%ab%e5%a4%a7%e5%90%97%ef%bc%9f%e5%8f%aa%e9%80%89%e4%b8%80%e4%b8%aa%e5%81%9a%e7%bc%93%e5%ad%98%e6%88%91%e4%bb%ac%e8%af%a5%e9%80%89%e5%93%aa%e4%b8%aa","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201549\/","title":{"rendered":"Redis \u548c Memcached \u7684\u533a\u522b\u5927\u5417\uff1f\u53ea\u9009\u4e00\u4e2a\u505a\u7f13\u5b58\u6211\u4eec\u8be5\u9009\u54ea\u4e2a\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Redis \u548c Memcached \u7684\u533a\u522b\u5927\u5417\uff1f\u53ea\u9009\u4e00\u4e2a\u505a\u7f13\u5b58\u6211\u4eec\u8be5\u9009\u54ea\u4e2a\uff1f<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u77e5\u8bc6\u70b9\u638c\u63e1\u4e86\uff0c\u8fd8\u9700\u8981\u4e0d\u65ad\u7ec3\u4e60\u624d\u80fd\u719f\u7ec3\u8fd0\u7528\u3002\u4e0b\u9762golang\u5b66\u4e60\u7f51\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u4e2a\u6570\u636e\u5e93\u5f00\u53d1\u5b9e\u6218\uff0c\u624b\u628a\u624b\u6559\u5927\u5bb6\u5b66\u4e60\u300aRedis \u548c Memcached \u7684\u533a\u522b\u5927\u5417\uff1f\u53ea\u9009\u4e00\u4e2a\u505a\u7f13\u5b58\u6211\u4eec\u8be5\u9009\u54ea\u4e2a\uff1f\u300b\uff0c\u5728\u5b9e\u73b0\u529f\u80fd\u7684\u8fc7\u7a0b\u4e2d\u4e5f\u5e26\u5927\u5bb6\u91cd\u65b0\u6e29\u4e60\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6e29\u6545\u800c\u77e5\u65b0\uff0c\u56de\u5934\u770b\u770b\u8bf4\u4e0d\u5b9a\u53c8\u6709\u4e0d\u4e00\u6837\u7684\u611f\u609f\uff01<\/p>\n

\u4e86\u89e3\u8fc7\u4e24\u8005\u7684\u540c\u5b66\u6709\u90a3\u4e48\u4e2a\u5927\u81f4\u7684\u5370\u8c61\uff1a<\/strong><\/p>\n

1\u3001redis\u4e0ememcached\u76f8\u6bd4\uff0c\u6bd4\u4ec5\u652f\u6301\u7b80\u5355\u7684key-value\u6570\u636e\u7c7b\u578b\uff0c\u540c\u65f6\u8fd8\u63d0\u4f9blist,set,zset,hash\u7b49\u6570\u636e\u7ed3\u6784\u7684\u5b58\u50a8\uff1b<\/p>\n

2\u3001redis\u652f\u6301\u6570\u636e\u7684\u5907\u4efd\uff0c\u5373master-slave\u6a21\u5f0f\u7684\u6570\u636e\u5907\u4efd\uff1b<\/p>\n

3\u3001redis\u652f\u6301\u6570\u636e\u7684\u6301\u4e45\u5316\uff0c\u53ef\u4ee5\u5c06\u5185\u5b58\u4e2d\u7684\u6570\u636e\u4fdd\u6301\u5728\u78c1\u76d8\u4e2d\uff0c\u91cd\u542f\u7684\u65f6\u5019\u53ef\u4ee5\u518d\u6b21\u52a0\u8f7d\u8fdb\u884c\u4f7f\u7528\u7b49\u7b49\u3002<\/p>\n

\u8fd9\u4f3c\u4e4e\u770b\u8d77\u6765redis\u6bd4memcached\u66f4\u52a0\u725b\u903c\u4e00\u4e9b\uff0c\u90a3\u4e48\u4e8b\u5b9e\u4e0a\u662f\u4e0d\u662f\u8fd9\u6837\u7684\u5462\uff1f\u5b58\u5728\u5373\u5408\u7406\uff0c\u6211\u4eec\u6765\u6839\u636e\u51e0\u4e2a\u4e0d\u540c\u70b9\u6765\u4e00\u4e00\u6bd4\u8f83\u4e00\u4e0b\u3002<\/p>\n

\u7f51\u7edcIO\u6a21\u578b<\/strong><\/p>\n

memcached\u662f\u591a\u7ebf\u7a0b\uff0c\u975e\u963b\u585eIO\u590d\u7528\u7684\u7f51\u7edc\u6a21\u578b\uff0c\u5206\u4e3a\u76d1\u542c\u4e3b\u7ebf\u7a0b\u548cworker\u5b50\u7ebf\u7a0b\uff0c\u76d1\u542c\u7ebf\u7a0b\u76d1\u542c\u7f51\u7edc\u8fde\u63a5\uff0c\u63a5\u53d7\u8bf7\u6c42\u540e\uff0c\u5c06\u8fde\u63a5\u63cf\u8ff0\u5b57pipe\u4f20\u9012\u7ed9worker\u7ebf\u7a0b\uff0c\u8fdb\u884c\u8bfb\u5199IO\uff0c\u7f51\u7edc\u5c42\u4f7f\u7528libevent\u5c01\u88c5\u7684\u4e8b\u4ef6\u5e93\uff0c\u591a\u7ebf\u7a0b\u6a21\u578b\u53ef\u4ee5\u53d1\u6325\u591a\u6838\u4f5c\u7528\uff0c\u4f46\u662f\u5f15\u5165\u4e86cache coherency\u548c\u9501\u7684\u95ee\u9898\uff0c\u6bd4\u5982\uff1amemcached\u6700\u5e38\u7528\u7684stats\u547d\u4ee4\uff0c\u5b9e\u9645memcached\u6240\u6709\u64cd\u4f5c\u90fd\u8981\u5bf9\u8fd9\u4e2a\u5168\u5c40\u53d8\u91cf\u52a0\u9501\uff0c\u8fdb\u884c\u6280\u672f\u7b49\u5de5\u4f5c\uff0c\u5e26\u6765\u4e86\u6027\u80fd\u635f\u8017\u3002<\/p>\n

redis\u4f7f\u7528\u5355\u7ebf\u7a0b\u7684IO\u590d\u7528\u6a21\u578b\uff0c\u81ea\u5df1\u5c01\u88c5\u4e86\u4e00\u4e2a\u7b80\u5355\u7684AeEvent\u4e8b\u4ef6\u5904\u7406\u6846\u67b6\uff0c\u4e3b\u8981\u5b9e\u73b0\u4e86epoll, kqueue\u548cselect\uff0c\u5bf9\u4e8e\u5355\u5b58\u53ea\u6709IO\u64cd\u4f5c\u6765\u8bf4\uff0c\u5355\u7ebf\u7a0b\u53ef\u4ee5\u5c06\u901f\u5ea6\u4f18\u52bf\u53d1\u6325\u5230***\uff0c\u4f46\u662fredis\u4e5f\u63d0\u4f9b\u4e86\u4e00\u4e9b\u7b80\u5355\u7684\u8ba1\u7b97\u529f\u80fd\uff0c\u6bd4\u5982\u6392\u5e8f\u3001\u805a\u5408\u7b49\uff0c\u5bf9\u4e8e\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u5355\u7ebf\u7a0b\u6a21\u578b\u65bd\u52a0\u4f1a\u4e25\u91cd\u5f71\u54cd\u6574\u4f53\u541e\u5410\u91cf\uff0cCPU\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\uff0c\u6574\u4e2aIO\u8c03\u5ea6\u90fd\u662f\u88ab\u963b\u585e\u7684\u3002<\/p>\n

\u6570\u636e\u652f\u6301\u7c7b\u578b<\/strong><\/p>\n

memcached\u4f7f\u7528key-value\u5f62\u5f0f\u5b58\u50a8\u548c\u8bbf\u95ee\u6570\u636e\uff0c\u5728\u5185\u5b58\u4e2d\u7ef4\u62a4\u4e00\u5f20\u5de8\u5927\u7684HashTable\uff0c\u4f7f\u5f97\u5bf9\u6570\u636e\u67e5\u8be2\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u964d\u4f4e\u5230O(1)\uff0c\u4fdd\u8bc1\u4e86\u5bf9\u6570\u636e\u7684\u9ad8\u6027\u80fd\u8bbf\u95ee\u3002<\/p>\n

\u6b63\u5982\u5f00\u7bc7\u6240\u8bf4\uff1aredis\u4e0ememcached\u76f8\u6bd4\uff0c\u6bd4\u4ec5\u652f\u6301\u7b80\u5355\u7684key-value\u6570\u636e\u7c7b\u578b\uff0c\u540c\u65f6\u8fd8\u63d0\u4f9blist,set,zset,hash\u7b49\u6570\u636e\u7ed3\u6784\u7684\u5b58\u50a8\uff1b\u8be6\u7ec6\u53ef\u4ee5\u7ffb\u9605\u300aRedis\u5185\u5b58\u4f7f\u7528\u4f18\u5316\u4e0e\u5b58\u50a8\u300b<\/p>\n<\/p>\n

<\/p>\n

\u5185\u5b58\u7ba1\u7406\u673a\u5236<\/strong><\/p>\n

\u5bf9\u4e8e\u50cfRedis\u548cMemcached\u8fd9\u79cd\u57fa\u4e8e\u5185\u5b58\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u6765\u8bf4\uff0c\u5185\u5b58\u7ba1\u7406\u7684\u6548\u7387\u9ad8\u4f4e\u662f\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\u7684\u5173\u952e\u56e0\u7d20\u3002\u4f20\u7edfC\u8bed\u8a00\u4e2d\u7684malloc\/free\u51fd\u6570\u662f\u6700\u5e38\u7528\u7684\u5206\u914d\u548c\u91ca\u653e\u5185\u5b58\u7684\u65b9\u6cd5\uff0c\u4f46\u662f\u8fd9\u79cd\u65b9\u6cd5\u5b58\u5728\u7740\u5f88\u5927\u7684\u7f3a\u9677\uff1a\u9996\u5148\uff0c\u5bf9\u4e8e\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\u4e0d\u5339\u914d\u7684malloc\u548cfree\u5bb9\u6613\u9020\u6210\u5185\u5b58\u6cc4\u9732\uff1b\u5176\u6b21\u9891\u7e41\u8c03\u7528\u4f1a\u9020\u6210\u5927\u91cf\u5185\u5b58\u788e\u7247\u65e0\u6cd5\u56de\u6536\u91cd\u65b0\u5229\u7528\uff0c\u964d\u4f4e\u5185\u5b58\u5229\u7528\u7387\uff1b***\u4f5c\u4e3a\u7cfb\u7edf\u8c03\u7528\uff0c\u5176\u7cfb\u7edf\u5f00\u9500\u8fdc\u8fdc\u5927\u4e8e\u4e00\u822c\u51fd\u6570\u8c03\u7528\u3002\u6240\u4ee5\uff0c\u4e3a\u4e86\u63d0\u9ad8\u5185\u5b58\u7684\u7ba1\u7406\u6548\u7387\uff0c\u9ad8\u6548\u7684\u5185\u5b58\u7ba1\u7406\u65b9\u6848\u90fd\u4e0d\u4f1a\u76f4\u63a5\u4f7f\u7528malloc\/free\u8c03\u7528\u3002Redis\u548cMemcached\u5747\u4f7f\u7528\u4e86\u81ea\u8eab\u8bbe\u8ba1\u7684\u5185\u5b58\u7ba1\u7406\u673a\u5236\uff0c\u4f46\u662f\u5b9e\u73b0\u65b9\u6cd5\u5b58\u5728\u5f88\u5927\u7684\u5dee\u5f02\uff0c\u4e0b\u9762\u5c06\u4f1a\u5bf9\u4e24\u8005\u7684\u5185\u5b58\u7ba1\u7406\u673a\u5236\u5206\u522b\u8fdb\u884c\u4ecb\u7ecd\u3002<\/p>\n

Memcached\u9ed8\u8ba4\u4f7f\u7528Slab Allocation\u673a\u5236\u7ba1\u7406\u5185\u5b58\uff0c\u5176\u4e3b\u8981\u601d\u60f3\u662f\u6309\u7167\u9884\u5148\u89c4\u5b9a\u7684\u5927\u5c0f\uff0c\u5c06\u5206\u914d\u7684\u5185\u5b58\u5206\u5272\u6210\u7279\u5b9a\u957f\u5ea6\u7684\u5757\u4ee5\u5b58\u50a8\u76f8\u5e94\u957f\u5ea6\u7684key-value\u6570\u636e\u8bb0\u5f55\uff0c\u4ee5\u5b8c\u5168\u89e3\u51b3\u5185\u5b58\u788e\u7247\u95ee\u9898\u3002Slab Allocation\u673a\u5236\u53ea\u4e3a\u5b58\u50a8\u5916\u90e8\u6570\u636e\u800c\u8bbe\u8ba1\uff0c\u4e5f\u5c31\u662f\u8bf4\u6240\u6709\u7684key-value\u6570\u636e\u90fd\u5b58\u50a8\u5728Slab Allocation\u7cfb\u7edf\u91cc\uff0c\u800cMemcached\u7684\u5176\u5b83\u5185\u5b58\u8bf7\u6c42\u5219\u901a\u8fc7\u666e\u901a\u7684malloc\/free\u6765\u7533\u8bf7\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u8bf7\u6c42\u7684\u6570\u91cf\u548c\u9891\u7387\u51b3\u5b9a\u4e86\u5b83\u4eec\u4e0d\u4f1a\u5bf9\u6574\u4e2a\u7cfb\u7edf\u7684\u6027\u80fd\u9020\u6210\u5f71\u54cdSlab Allocation\u7684\u539f\u7406\u76f8\u5f53\u7b80\u5355\u3002 \u5982\u56fe\u6240\u793a\uff0c\u5b83\u9996\u5148\u4ece\u64cd\u4f5c\u7cfb\u7edf\u7533\u8bf7\u4e00\u5927\u5757\u5185\u5b58\uff0c\u5e76\u5c06\u5176\u5206\u5272\u6210\u5404\u79cd\u5c3a\u5bf8\u7684\u5757Chunk\uff0c\u5e76\u628a\u5c3a\u5bf8\u76f8\u540c\u7684\u5757\u5206\u6210\u7ec4Slab Class\u3002\u5176\u4e2d\uff0cChunk\u5c31\u662f\u7528\u6765\u5b58\u50a8key-value\u6570\u636e\u7684\u6700\u5c0f\u5355\u4f4d\u3002\u6bcf\u4e2aSlab Class\u7684\u5927\u5c0f\uff0c\u53ef\u4ee5\u5728Memcached\u542f\u52a8\u7684\u65f6\u5019\u901a\u8fc7\u5236\u5b9aGrowth Factor\u6765\u63a7\u5236\u3002\u5047\u5b9a\u56fe\u4e2dGrowth Factor\u7684\u53d6\u503c\u4e3a1.25\uff0c\u5982\u679c***\u7ec4Chunk\u7684\u5927\u5c0f\u4e3a88\u4e2a\u5b57\u8282\uff0c\u7b2c\u4e8c\u7ec4Chunk\u7684\u5927\u5c0f\u5c31\u4e3a112\u4e2a\u5b57\u8282\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002<\/p>\n<\/p>\n

<\/p>\n

\u5f53Memcached\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u53d1\u9001\u8fc7\u6765\u7684\u6570\u636e\u65f6\u9996\u5148\u4f1a\u6839\u636e\u6536\u5230\u6570\u636e\u7684\u5927\u5c0f\u9009\u62e9\u4e00\u4e2a\u6700\u5408\u9002\u7684Slab Class\uff0c\u7136\u540e\u901a\u8fc7\u67e5\u8be2Memcached\u4fdd\u5b58\u7740\u7684\u8be5Slab Class\u5185\u7a7a\u95f2Chunk\u7684\u5217\u8868\u5c31\u53ef\u4ee5\u627e\u5230\u4e00\u4e2a\u53ef\u7528\u4e8e\u5b58\u50a8\u6570\u636e\u7684Chunk\u3002\u5f53\u4e00\u6761\u6570\u636e\u5e93\u8fc7\u671f\u6216\u8005\u4e22\u5f03\u65f6\uff0c\u8be5\u8bb0\u5f55\u6240\u5360\u7528\u7684Chunk\u5c31\u53ef\u4ee5\u56de\u6536\uff0c\u91cd\u65b0\u6dfb\u52a0\u5230\u7a7a\u95f2\u5217\u8868\u4e2d\u3002\u4ece\u4ee5\u4e0a\u8fc7\u7a0b\u6211\u4eec\u53ef\u4ee5\u770b\u51faMemcached\u7684\u5185\u5b58\u7ba1\u7406\u5236\u6548\u7387\u9ad8\uff0c\u800c\u4e14\u4e0d\u4f1a\u9020\u6210\u5185\u5b58\u788e\u7247\uff0c\u4f46\u662f\u5b83***\u7684\u7f3a\u70b9\u5c31\u662f\u4f1a\u5bfc\u81f4\u7a7a\u95f4\u6d6a\u8d39\u3002\u56e0\u4e3a\u6bcf\u4e2aChunk\u90fd\u5206\u914d\u4e86\u7279\u5b9a\u957f\u5ea6\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u6240\u4ee5\u53d8\u957f\u6570\u636e\u65e0\u6cd5\u5145\u5206\u5229\u7528\u8fd9\u4e9b\u7a7a\u95f4\u3002\u5982\u56fe \u6240\u793a\uff0c\u5c06100\u4e2a\u5b57\u8282\u7684\u6570\u636e\u7f13\u5b58\u5230128\u4e2a\u5b57\u8282\u7684Chunk\u4e2d\uff0c\u5269\u4f59\u768428\u4e2a\u5b57\u8282\u5c31\u6d6a\u8d39\u6389\u4e86\u3002<\/p>\n<\/p>\n

<\/p>\n

Redis\u7684\u5185\u5b58\u7ba1\u7406\u4e3b\u8981\u901a\u8fc7\u6e90\u7801\u4e2dzmalloc.h\u548czmalloc.c\u4e24\u4e2a\u6587\u4ef6\u6765\u5b9e\u73b0\u7684\u3002Redis\u4e3a\u4e86\u65b9\u4fbf\u5185\u5b58\u7684\u7ba1\u7406\uff0c\u5728\u5206\u914d\u4e00\u5757\u5185\u5b58\u4e4b\u540e\uff0c\u4f1a\u5c06\u8fd9\u5757\u5185\u5b58\u7684\u5927\u5c0f\u5b58\u5165\u5185\u5b58\u5757\u7684\u5934\u90e8\u3002\u5982\u56fe\u6240\u793a\uff0creal_ptr\u662fredis\u8c03\u7528malloc\u540e\u8fd4\u56de\u7684\u6307\u9488\u3002redis\u5c06\u5185\u5b58\u5757\u7684\u5927\u5c0fsize\u5b58\u5165\u5934\u90e8\uff0csize\u6240\u5360\u636e\u7684\u5185\u5b58\u5927\u5c0f\u662f\u5df2\u77e5\u7684\uff0c\u4e3asize_t\u7c7b\u578b\u7684\u957f\u5ea6\uff0c\u7136\u540e\u8fd4\u56deret_ptr\u3002\u5f53\u9700\u8981\u91ca\u653e\u5185\u5b58\u7684\u65f6\u5019\uff0cret_ptr\u88ab\u4f20\u7ed9\u5185\u5b58\u7ba1\u7406\u7a0b\u5e8f\u3002\u901a\u8fc7ret_ptr\uff0c\u7a0b\u5e8f\u53ef\u4ee5\u5f88\u5bb9\u6613\u7684\u7b97\u51fareal_ptr\u7684\u503c\uff0c\u7136\u540e\u5c06real_ptr\u4f20\u7ed9free\u91ca\u653e\u5185\u5b58\u3002<\/p>\n<\/p>\n

<\/p>\n

Redis\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u6570\u7ec4\u6765\u8bb0\u5f55\u6240\u6709\u7684\u5185\u5b58\u5206\u914d\u60c5\u51b5\uff0c\u8fd9\u4e2a\u6570\u7ec4\u7684\u957f\u5ea6\u4e3aZMALLOC_MAX_ALLOC_STAT\u3002\u6570\u7ec4\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u4ee3\u8868\u5f53\u524d\u7a0b\u5e8f\u6240\u5206\u914d\u7684\u5185\u5b58\u5757\u7684\u4e2a\u6570\uff0c\u4e14\u5185\u5b58\u5757\u7684\u5927\u5c0f\u4e3a\u8be5\u5143\u7d20\u7684\u4e0b\u6807\u3002\u5728\u6e90\u7801\u4e2d\uff0c\u8fd9\u4e2a\u6570\u7ec4\u4e3azmalloc_allocations\u3002zmalloc_allocations[16]\u4ee3\u8868\u5df2\u7ecf\u5206\u914d\u7684\u957f\u5ea6\u4e3a16bytes\u7684\u5185\u5b58\u5757\u7684\u4e2a\u6570\u3002zmalloc.c\u4e2d\u6709\u4e00\u4e2a\u9759\u6001\u53d8\u91cfused_memory\u7528\u6765\u8bb0\u5f55\u5f53\u524d\u5206\u914d\u7684\u5185\u5b58\u603b\u5927\u5c0f\u3002\u6240\u4ee5\uff0c\u603b\u7684\u6765\u770b\uff0cRedis\u91c7\u7528\u7684\u662f\u5305\u88c5\u7684mallc\/free\uff0c\u76f8\u8f83\u4e8eMemcached\u7684\u5185\u5b58\u7ba1\u7406\u65b9\u6cd5\u6765\u8bf4\uff0c\u8981\u7b80\u5355\u5f88\u591a\u3002<\/p>\n

\u5728Redis\u4e2d\uff0c\u5e76\u4e0d\u662f\u6240\u6709\u7684\u6570\u636e\u90fd\u4e00\u76f4\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u7684\u3002\u8fd9\u662f\u548cMemcached\u76f8\u6bd4\u4e00\u4e2a***\u7684\u533a\u522b\u3002\u5f53\u7269\u7406\u5185\u5b58\u7528\u5b8c\u65f6\uff0cRedis\u53ef\u4ee5\u5c06\u4e00\u4e9b\u5f88\u4e45\u6ca1\u7528\u5230\u7684value\u4ea4\u6362\u5230\u78c1\u76d8\u3002Redis\u53ea\u4f1a\u7f13\u5b58\u6240\u6709\u7684key\u7684\u4fe1\u606f\uff0c\u5982\u679cRedis\u53d1\u73b0\u5185\u5b58\u7684\u4f7f\u7528\u91cf\u8d85\u8fc7\u4e86\u67d0\u4e00\u4e2a\u9600\u503c\uff0c\u5c06\u89e6\u53d1swap\u7684\u64cd\u4f5c\uff0cRedis\u6839\u636e\u201cswappability = age*log(size_in_memory)\u201d\u8ba1\u7b97\u51fa\u54ea\u4e9bkey\u5bf9\u5e94\u7684value\u9700\u8981swap\u5230\u78c1\u76d8\u3002\u7136\u540e\u518d\u5c06\u8fd9\u4e9bkey\u5bf9\u5e94\u7684value\u6301\u4e45\u5316\u5230\u78c1\u76d8\u4e2d\uff0c\u540c\u65f6\u5728\u5185\u5b58\u4e2d\u6e05\u9664\u3002\u8fd9\u79cd\u7279\u6027\u4f7f\u5f97Redis\u53ef\u4ee5\u4fdd\u6301\u8d85\u8fc7\u5176\u673a\u5668\u672c\u8eab\u5185\u5b58\u5927\u5c0f\u7684\u6570\u636e\u3002\u5f53\u7136\uff0c\u673a\u5668\u672c\u8eab\u7684\u5185\u5b58\u5fc5\u987b\u8981\u80fd\u591f\u4fdd\u6301\u6240\u6709\u7684key\uff0c\u6bd5\u7adf\u8fd9\u4e9b\u6570\u636e\u662f\u4e0d\u4f1a\u8fdb\u884cswap\u64cd\u4f5c\u7684\u3002\u540c\u65f6\u7531\u4e8eRedis\u5c06\u5185\u5b58\u4e2d\u7684\u6570\u636eswap\u5230\u78c1\u76d8\u4e2d\u7684\u65f6\u5019\uff0c\u63d0\u4f9b\u670d\u52a1\u7684\u4e3b\u7ebf\u7a0b\u548c\u8fdb\u884cswap\u64cd\u4f5c\u7684\u5b50\u7ebf\u7a0b\u4f1a\u5171\u4eab\u8fd9\u90e8\u5206\u5185\u5b58\uff0c\u6240\u4ee5\u5982\u679c\u66f4\u65b0\u9700\u8981swap\u7684\u6570\u636e\uff0cRedis\u5c06\u963b\u585e\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u76f4\u5230\u5b50\u7ebf\u7a0b\u5b8c\u6210swap\u64cd\u4f5c\u540e\u624d\u53ef\u4ee5\u8fdb\u884c\u4fee\u6539\u3002\u5f53\u4eceRedis\u4e2d\u8bfb\u53d6\u6570\u636e\u7684\u65f6\u5019\uff0c\u5982\u679c\u8bfb\u53d6\u7684key\u5bf9\u5e94\u7684value\u4e0d\u5728\u5185\u5b58\u4e2d\uff0c\u90a3\u4e48Redis\u5c31\u9700\u8981\u4eceswap\u6587\u4ef6\u4e2d\u52a0\u8f7d\u76f8\u5e94\u6570\u636e\uff0c\u7136\u540e\u518d\u8fd4\u56de\u7ed9\u8bf7\u6c42\u65b9\u3002 \u8fd9\u91cc\u5c31\u5b58\u5728\u4e00\u4e2aI\/O\u7ebf\u7a0b\u6c60\u7684\u95ee\u9898\u3002\u5728\u9ed8\u8ba4\u7684\u60c5\u51b5\u4e0b\uff0cRedis\u4f1a\u51fa\u73b0\u963b\u585e\uff0c\u5373\u5b8c\u6210\u6240\u6709\u7684swap\u6587\u4ef6\u52a0\u8f7d\u540e\u624d\u4f1a\u76f8\u5e94\u3002\u8fd9\u79cd\u7b56\u7565\u5728\u5ba2\u6237\u7aef\u7684\u6570\u91cf\u8f83\u5c0f\uff0c\u8fdb\u884c\u6279\u91cf\u64cd\u4f5c\u7684\u65f6\u5019\u6bd4\u8f83\u5408\u9002\u3002\u4f46\u662f\u5982\u679c\u5c06Redis\u5e94\u7528\u5728\u4e00\u4e2a\u5927\u578b\u7684\u7f51\u7ad9\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u8fd9\u663e\u7136\u662f\u65e0\u6cd5\u6ee1\u8db3\u5927\u5e76\u53d1\u7684\u60c5\u51b5\u7684\u3002\u6240\u4ee5Redis\u8fd0\u884c\u6211\u4eec\u8bbe\u7f6eI\/O\u7ebf\u7a0b\u6c60\u7684\u5927\u5c0f\uff0c\u5bf9\u9700\u8981\u4eceswap\u6587\u4ef6\u4e2d\u52a0\u8f7d\u76f8\u5e94\u6570\u636e\u7684\u8bfb\u53d6\u8bf7\u6c42\u8fdb\u884c\u5e76\u53d1\u64cd\u4f5c\uff0c\u51cf\u5c11\u963b\u585e\u7684\u65f6\u95f4\u3002<\/p>\n

Memcached\u4f7f\u7528\u9884\u5206\u914d\u7684\u5185\u5b58\u6c60\u7684\u65b9\u5f0f\uff0c\u4f7f\u7528slab\u548c\u5927\u5c0f\u4e0d\u540c\u7684chunk\u6765\u7ba1\u7406\u5185\u5b58\uff0cItem\u6839\u636e\u5927\u5c0f\u9009\u62e9\u5408\u9002\u7684chunk\u5b58\u50a8\uff0c\u5185\u5b58\u6c60\u7684\u65b9\u5f0f\u53ef\u4ee5\u7701\u53bb\u7533\u8bf7\/\u91ca\u653e\u5185\u5b58\u7684\u5f00\u9500\uff0c\u5e76\u4e14\u80fd\u51cf\u5c0f\u5185\u5b58\u788e\u7247\u4ea7\u751f\uff0c\u4f46\u8fd9\u79cd\u65b9\u5f0f\u4e5f\u4f1a\u5e26\u6765\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u7684\u7a7a\u95f4\u6d6a\u8d39\uff0c\u5e76\u4e14\u5728\u5185\u5b58\u4ecd\u7136\u6709\u5f88\u5927\u7a7a\u95f4\u65f6\uff0c\u65b0\u7684\u6570\u636e\u4e5f\u53ef\u80fd\u4f1a\u88ab\u5254\u9664\uff0c\u539f\u56e0\u53ef\u4ee5\u53c2\u8003Timyang\u7684\u6587\u7ae0\uff1ahttp:\/\/timyang.net\/data\/Memcached-lru-evictions\/<\/p>\n

Redis\u4f7f\u7528\u73b0\u573a\u7533\u8bf7\u5185\u5b58\u7684\u65b9\u5f0f\u6765\u5b58\u50a8\u6570\u636e\uff0c\u5e76\u4e14\u5f88\u5c11\u4f7f\u7528free-list\u7b49\u65b9\u5f0f\u6765\u4f18\u5316\u5185\u5b58\u5206\u914d\uff0c\u4f1a\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u5b58\u5728\u5185\u5b58\u788e\u7247\uff0cRedis\u8ddf\u636e\u5b58\u50a8\u547d\u4ee4\u53c2\u6570\uff0c\u4f1a\u628a\u5e26\u8fc7\u671f\u65f6\u95f4\u7684\u6570\u636e\u5355\u72ec\u5b58\u653e\u5728\u4e00\u8d77\uff0c\u5e76\u628a\u5b83\u4eec\u79f0\u4e3a\u4e34\u65f6\u6570\u636e\uff0c\u975e\u4e34\u65f6\u6570\u636e\u662f\u6c38\u8fdc\u4e0d\u4f1a\u88ab\u5254\u9664\u7684\uff0c\u5373\u4fbf\u7269\u7406\u5185\u5b58\u4e0d\u591f\uff0c\u5bfc\u81f4swap\u4e5f\u4e0d\u4f1a\u5254\u9664\u4efb\u4f55\u975e\u4e34\u65f6\u6570\u636e\uff08\u4f46\u4f1a\u5c1d\u8bd5\u5254\u9664\u90e8\u5206\u4e34\u65f6\u6570\u636e\uff09\uff0c\u8fd9\u70b9\u4e0aRedis\u66f4\u9002\u5408\u4f5c\u4e3a\u5b58\u50a8\u800c\u4e0d\u662fcache\u3002<\/p>\n<\/p>\n

<\/p>\n

\u6570\u636e\u5b58\u50a8\u53ca\u6301\u4e45\u5316<\/strong><\/p>\n

memcached\u4e0d\u652f\u6301\u5185\u5b58\u6570\u636e\u7684\u6301\u4e45\u5316\u64cd\u4f5c\uff0c\u6240\u6709\u7684\u6570\u636e\u90fd\u4ee5in-memory\u7684\u5f62\u5f0f\u5b58\u50a8\u3002<\/p>\n

redis\u652f\u6301\u6301\u4e45\u5316\u64cd\u4f5c\u3002redis\u63d0\u4f9b\u4e86\u4e24\u79cd\u4e0d\u540c\u7684\u6301\u4e45\u5316\u65b9\u6cd5\u6765\u8bb2\u6570\u636e\u5b58\u50a8\u5230\u786c\u76d8\u91cc\u9762\uff0c\u4e00\u79cd\u662f\u5feb\u7167\uff08snapshotting)\uff0c\u5b83\u53ef\u4ee5\u5c06\u5b58\u5728\u4e8e\u67d0\u4e00\u65f6\u523b\u7684\u6240\u6709\u6570\u636e\u90fd\u5199\u5165\u786c\u76d8\u91cc\u9762\u3002\u53e6\u4e00\u79cd\u65b9\u6cd5\u53eb\u53ea\u8ffd\u52a0\u6587\u4ef6\uff08append-only file\uff0c AOF),\u5b83\u4f1a\u5728\u6267\u884c\u5199\u547d\u4ee4\u65f6\uff0c\u5c06\u88ab\u6267\u884c\u7684\u5199\u547d\u4ee4\u590d\u5236\u5230\u786c\u76d8\u91cc\u9762\u3002<\/p>\n

\u6570\u636e\u4e00\u81f4\u6027\u95ee\u9898<\/strong><\/p>\n

Memcached\u63d0\u4f9b\u4e86cas\u547d\u4ee4\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u591a\u4e2a\u5e76\u53d1\u8bbf\u95ee\u64cd\u4f5c\u540c\u4e00\u4efd\u6570\u636e\u7684\u4e00\u81f4\u6027\u95ee\u9898\u3002 Redis\u6ca1\u6709\u63d0\u4f9bcas \u547d\u4ee4\uff0c\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u8fd9\u70b9\uff0c\u4e0d\u8fc7Redis\u63d0\u4f9b\u4e86\u4e8b\u52a1\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u4e00\u4e32 \u547d\u4ee4\u7684\u539f\u5b50\u6027\uff0c\u4e2d\u95f4\u4e0d\u4f1a\u88ab\u4efb\u4f55\u64cd\u4f5c\u6253\u65ad\u3002<\/p>\n

\u96c6\u7fa4\u7ba1\u7406\u4e0d\u540c<\/strong><\/p>\n

Memcached\u662f\u5168\u5185\u5b58\u7684\u6570\u636e\u7f13\u51b2\u7cfb\u7edf\uff0cRedis\u867d\u7136\u652f\u6301\u6570\u636e\u7684\u6301\u4e45\u5316\uff0c\u4f46\u662f\u5168\u5185\u5b58\u6bd5\u7adf\u624d\u662f\u5176\u9ad8\u6027\u80fd\u7684\u672c\u8d28\u3002\u4f5c\u4e3a\u57fa\u4e8e\u5185\u5b58\u7684\u5b58\u50a8\u7cfb\u7edf\u6765\u8bf4\uff0c\u673a\u5668\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\u5c31\u662f\u7cfb\u7edf\u80fd\u591f\u5bb9\u7eb3\u7684***\u6570\u636e\u91cf\u3002\u5982\u679c\u9700\u8981\u5904\u7406\u7684\u6570\u636e\u91cf\u8d85\u8fc7\u4e86\u5355\u53f0\u673a\u5668\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f\uff0c\u5c31\u9700\u8981\u6784\u5efa\u5206\u5e03\u5f0f\u96c6\u7fa4\u6765\u6269\u5c55\u5b58\u50a8\u80fd\u529b\u3002<\/p>\n

Memcached\u672c\u8eab\u5e76\u4e0d\u652f\u6301\u5206\u5e03\u5f0f\uff0c\u56e0\u6b64\u53ea\u80fd\u5728\u5ba2\u6237\u7aef\u901a\u8fc7\u50cf\u4e00\u81f4\u6027\u54c8\u5e0c\u8fd9\u6837\u7684\u5206\u5e03\u5f0f\u7b97\u6cd5\u6765\u5b9e\u73b0Memcached\u7684\u5206\u5e03\u5f0f\u5b58\u50a8\u3002\u4e0b\u56fe\u7ed9\u51fa\u4e86Memcached\u7684\u5206\u5e03\u5f0f\u5b58\u50a8\u5b9e\u73b0\u67b6\u6784\u3002\u5f53\u5ba2\u6237\u7aef\u5411Memcached\u96c6\u7fa4\u53d1\u9001\u6570\u636e\u4e4b\u524d\uff0c\u9996\u5148\u4f1a\u901a\u8fc7\u5185\u7f6e\u7684\u5206\u5e03\u5f0f\u7b97\u6cd5\u8ba1\u7b97\u51fa\u8be5\u6761\u6570\u636e\u7684\u76ee\u6807\u8282\u70b9\uff0c\u7136\u540e\u6570\u636e\u4f1a\u76f4\u63a5\u53d1\u9001\u5230\u8be5\u8282\u70b9\u4e0a\u5b58\u50a8\u3002\u4f46\u5ba2\u6237\u7aef\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u540c\u6837\u8981\u8ba1\u7b97\u51fa\u67e5\u8be2\u6570\u636e\u6240\u5728\u7684\u8282\u70b9\uff0c\u7136\u540e\u76f4\u63a5\u5411\u8be5\u8282\u70b9\u53d1\u9001\u67e5\u8be2\u8bf7\u6c42\u4ee5\u83b7\u53d6\u6570\u636e\u3002<\/p>\n

\u76f8\u8f83\u4e8eMemcached\u53ea\u80fd\u91c7\u7528\u5ba2\u6237\u7aef\u5b9e\u73b0\u5206\u5e03\u5f0f\u5b58\u50a8\uff0cRedis\u66f4\u504f\u5411\u4e8e\u5728\u670d\u52a1\u5668\u7aef\u6784\u5efa\u5206\u5e03\u5f0f\u5b58\u50a8\u3002***\u7248\u672c\u7684Redis\u5df2\u7ecf\u652f\u6301\u4e86\u5206\u5e03\u5f0f\u5b58\u50a8\u529f\u80fd\u3002Redis Cluster\u662f\u4e00\u4e2a\u5b9e\u73b0\u4e86\u5206\u5e03\u5f0f\u4e14\u5141\u8bb8\u5355\u70b9\u6545\u969c\u7684Redis\u9ad8\u7ea7\u7248\u672c\uff0c\u5b83\u6ca1\u6709\u4e2d\u5fc3\u8282\u70b9\uff0c\u5177\u6709\u7ebf\u6027\u53ef\u4f38\u7f29\u7684\u529f\u80fd\u3002Redis Cluster\u7684\u5206\u5e03\u5f0f\u5b58\u50a8\u67b6\u6784\uff0c\u8282\u70b9\u4e0e\u8282\u70b9\u4e4b\u95f4\u901a\u8fc7\u4e8c\u8fdb\u5236\u534f\u8bae\u8fdb\u884c\u901a\u4fe1\uff0c\u8282\u70b9\u4e0e\u5ba2\u6237\u7aef\u4e4b\u95f4\u901a\u8fc7ascii\u534f\u8bae\u8fdb\u884c\u901a\u4fe1\u3002\u5728\u6570\u636e\u7684\u653e\u7f6e\u7b56\u7565\u4e0a\uff0cRedis Cluster\u5c06\u6574\u4e2akey\u7684\u6570\u503c\u57df\u5206\u62104096\u4e2a\u54c8\u5e0c\u69fd\uff0c\u6bcf\u4e2a\u8282\u70b9\u4e0a\u53ef\u4ee5\u5b58\u50a8\u4e00\u4e2a\u6216\u591a\u4e2a\u54c8\u5e0c\u69fd\uff0c\u4e5f\u5c31\u662f\u8bf4\u5f53\u524dRedis Cluster\u652f\u6301\u7684***\u8282\u70b9\u6570\u5c31\u662f4096\u3002Redis Cluster\u4f7f\u7528\u7684\u5206\u5e03\u5f0f\u7b97\u6cd5\u4e5f\u5f88\u7b80\u5355\uff1acrc16( key ) % HASH_SLOTS_NUMBER\u3002<\/p>\n

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Redis \u548c Memcache...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201549","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201549","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201549"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201549\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201549"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201549"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}