{"id":201775,"date":"2025-05-10T10:24:33","date_gmt":"2025-05-10T02:24:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201775\/"},"modified":"2025-05-10T10:24:33","modified_gmt":"2025-05-10T02:24:33","slug":"redis%e7%9a%84%e7%bd%91%e7%bb%9cio%e6%a8%a1%e5%9e%8b%e5%88%86%e6%9e%90%e4%b8%8e%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201775\/","title":{"rendered":"Redis\u7684\u7f51\u7edcIO\u6a21\u578b\u5206\u6790\u4e0e\u5e94\u7528"},"content":{"rendered":"

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

Redis\u7684\u7f51\u7edcIO\u6a21\u578b\u5206\u6790\u4e0e\u5e94\u7528<\/h1>\n

\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60\u6570\u636e\u5e93<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300aRedis\u7684\u7f51\u7edcIO\u6a21\u578b\u5206\u6790\u4e0e\u5e94\u7528\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

Redis\u662f\u4e00\u6b3e\u5f00\u6e90\u7684\u9ad8\u6027\u80fd\u952e\u503c\u5b58\u50a8\u7cfb\u7edf\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5927\u6570\u636e\u3001\u67b6\u6784\u8bbe\u8ba1\u7b49\u9886\u57df\u3002\u5176\u9ad8\u6548\u7684\u7f51\u7edcIO\u6a21\u578b\u662f\u5176\u5feb\u901f\u54cd\u5e94\u8bf7\u6c42\u7684\u91cd\u8981\u57fa\u7840\u3002\u672c\u6587\u5c06\u4ecb\u7ecdRedis\u7684\u7f51\u7edcIO\u6a21\u578b\u53ca\u5176\u5b9e\u73b0\u539f\u7406\uff0c\u5e76\u63a2\u8ba8\u5176\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u4f18\u5316\u65b9\u6cd5\u3002<\/p>\n

\u4e00\u3001Redis\u7684\u7f51\u7edcIO\u6a21\u578b<\/p>\n

Redis\u7684\u7f51\u7edcIO\u6a21\u578b\u9009\u62e9\u4e86\u5355\u7ebf\u7a0b\u548c\u591a\u8def\u590d\u7528\u7ed3\u5408\u7684\u65b9\u5f0f\u3002\u5176\u57fa\u672c\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n

    \n
  1. Redis\u9996\u5148\u901a\u8fc7socket\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u76d1\u542csocket\u5e76\u7ed1\u5b9a\u670d\u52a1\u7aef\u53e3\u3002<\/li>\n
  2. Redis\u8fdb\u5165\u4e3b\u5faa\u73af\uff0c\u5728\u4e3b\u5faa\u73af\u4e2d\u8c03\u7528select\u51fd\u6570\uff0c\u5c06\u76d1\u542csocket\u548c\u5ba2\u6237\u7aef\u8fde\u63a5socket\u90fd\u52a0\u5165\u5230\u76d1\u89c6\u5217\u8868\u4e2d\uff0c\u963b\u585e\u7b49\u5f85\u6709\u4e8b\u4ef6\u53d1\u751f\u3002<\/li>\n
  3. \u5f53\u76d1\u542csocket\u6709\u8fde\u63a5\u8bf7\u6c42\u65f6\uff0cselect\u51fd\u6570\u4f1a\u8fd4\u56de\u8fde\u63a5\u8bf7\u6c42\u4e8b\u4ef6\uff0c\u6b64\u65f6Redis\u901a\u8fc7accept\u51fd\u6570\u63a5\u6536\u8fde\u63a5\u8bf7\u6c42\uff0c\u5e76\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5socket\u3002<\/li>\n
  4. \u63a5\u7740Redis\u5c06\u65b0\u5efa\u7684\u5ba2\u6237\u7aef\u8fde\u63a5socket\u52a0\u5165\u5230\u76d1\u89c6\u5217\u8868\u4e2d\u3002<\/li>\n
  5. Redis\u5f00\u59cb\u5904\u7406\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u8bf7\u6c42\u3002\u5f53\u6709\u8bfb\u4e8b\u4ef6\uff08\u5373\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\uff09\u65f6\uff0cselect\u51fd\u6570\u4f1a\u8fd4\u56de\u8bfb\u53d6\u4e8b\u4ef6\u3002\u6b64\u65f6Redis\u901a\u8fc7read\u51fd\u6570\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u8bf7\u6c42\u3002<\/li>\n
  6. Redis\u8fdb\u884c\u8bf7\u6c42\u5904\u7406\uff0c\u5904\u7406\u4e4b\u540e\u5c06\u7ed3\u679c\u901a\u8fc7send\u51fd\u6570\u53d1\u9001\u5230\u5ba2\u6237\u7aef\u8fde\u63a5socket\u4e2d\u3002<\/li>\n
  7. select\u51fd\u6570\u518d\u6b21\u963b\u585e\u7b49\u5f85\u4e8b\u4ef6\u7684\u53d1\u751f\u3002<\/li>\n<\/ol>\n

    \u4ee5\u4e0a\u4fbf\u662fRedis\u7684\u7f51\u7edcIO\u6a21\u578b\u6d41\u7a0b\u3002\u7531\u4e8eRedis\u91c7\u7528\u5355\u7ebf\u7a0b\u65b9\u5f0f\uff0c\u56e0\u6b64\u907f\u514d\u4e86\u591a\u7ebf\u7a0b\u5e26\u6765\u7684\u4e0a\u4e0b\u6587\u5207\u6362\u53ca\u9501\u7ade\u4e89\u7684\u5f00\u9500\u3002\u800c\u591a\u8def\u590d\u7528\u6280\u672f\u5219\u53ef\u4ee5\u8ba9\u4e00\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u5e76\u53d1\u5904\u7406\u80fd\u529b\u3002
    \u4e8c\u3001Redis\u7f51\u7edcIO\u6a21\u578b\u7684\u5b9e\u73b0\u539f\u7406<\/p>\n

    Redis\u91c7\u7528\u7684\u591a\u8def\u590d\u7528\u6280\u672f\u4e3b\u8981\u662f\u5229\u7528Linux\u5185\u6838\u63d0\u4f9b\u7684select\u3001poll\u3001epoll\u7b49\u51fd\u6570\u6765\u5b9e\u73b0\u3002\u5176\u4e2d\uff0cselect\u548cpoll\u51fd\u6570\u652f\u6301\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u6709\u9650\uff0c\u800cepoll\u51fd\u6570\u5219\u53ef\u4ee5\u652f\u6301\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\uff0c\u5176\u6027\u80fd\u4e5f\u66f4\u52a0\u9ad8\u6548\u3002\u56e0\u6b64\uff0cRedis\u5728Linux 2.6\u4ee5\u4e0a\u7684\u7248\u672c\u4e2d\uff0c\u9996\u9009\u4f7f\u7528epoll\u51fd\u6570\u3002<\/p>\n

    Redis\u5728\u542f\u52a8\u65f6\u4f1a\u521b\u5efa\u4e00\u4e2aepoll\u7684\u53e5\u67c4\uff0c\u5e76\u5c06\u76d1\u542csocket\uff08\u5373\u4e3b\u670d\u52a1\u7aef\u53e3\uff09\u52a0\u5165\u5230epoll\u4e2d\u8fdb\u884c\u76d1\u63a7\u3002\u5f53\u6709\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u65f6\uff0c\u5c31\u901a\u8fc7accept\u51fd\u6570\u5904\u7406\u8fde\u63a5\uff0c\u5e76\u5c06\u65b0\u8fde\u63a5\u7684socket\u52a0\u5165\u5230epoll\u7ba1\u7406\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d\u3002\u5f53\u6709\u6570\u636e\u53ef\u8bfb\u65f6\uff0cepoll\u4f1a\u901a\u77e5Redis\uff0cRedis\u5219\u4f1a\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u8bf7\u6c42\uff0c\u5e76\u6839\u636e\u534f\u8bae\u8fdb\u884c\u89e3\u6790\u548c\u5904\u7406\uff0c\u6700\u7ec8\u5c06\u54cd\u5e94\u6570\u636e\u5199\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n

    \u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cRedis\u4e2d\u91c7\u7528\u7684\u662f\u975e\u963b\u585eIO\uff08Non-Blocking IO\uff09\u65b9\u5f0f\u3002\u5176\u539f\u7406\u662f\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f\uff0c\u4ece\u800c\u5229\u7528\u5185\u6838\u5f02\u6b65IO\u7684\u7279\u6027\u6765\u5b9e\u73b0\u975e\u963b\u585e\u8bfb\u5199\u64cd\u4f5c\uff0c\u907f\u514d\u4e86\u8fdb\u7a0b\u963b\u585e\u7b49\u5f85IO\u64cd\u4f5c\u8fd4\u56de\u7684\u60c5\u51b5\u3002\u5728\u975e\u963b\u585eIO\u7684\u6a21\u5f0f\u4e0b\uff0c\u8bfb\u53d6\u64cd\u4f5c\u8fd4\u56de\u65f6\uff0c\u5f53\u524d\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u53ef\u80fd\u8fd8\u5b58\u5728\u672a\u8bfb\u5b8c\u7684\u6570\u636e\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u7528\u5faa\u73af\u8bfb\u53d6\u76f4\u81f3\u8bfb\u5b8c\u6240\u6709\u6570\u636e\u3002\u5199\u5165\u64cd\u4f5c\u4e5f\u7c7b\u4f3c\uff0c\u9700\u8981\u5faa\u73af\u5199\u5165\u6570\u636e\u76f4\u81f3\u5199\u5b8c\u6240\u6709\u6570\u636e\u3002<\/p>\n

    \u4e09\u3001Redis\u7f51\u7edcIO\u6a21\u578b\u7684\u4f18\u5316<\/p>\n

      \n
    1. \u7981\u7528TCP Nagle\u7b97\u6cd5<\/li>\n<\/ol>\n

      TCP Nagle\u7b97\u6cd5\u662f\u4e00\u79cd\u4ee5\u51cf\u5c11\u7f51\u7edc\u4e0a\u7684\u5c0f\u6570\u636e\u5305\u7684\u6570\u91cf\u6765\u63d0\u9ad8\u7f51\u7edc\u4f20\u8f93\u6548\u7387\u7684\u7b97\u6cd5\u3002\u4f46\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\uff0c\u9700\u8981\u7acb\u5373\u53d1\u9001\u6570\u636e\uff0c\u5982\u7528\u6237\u767b\u5f55\u7b49\u64cd\u4f5c\uff0c\u6b64\u65f6\u4e0d\u80fd\u7b49\u5230\u6570\u636e\u8fbe\u5230\u6700\u4f73\u5c3a\u5bf8\u518d\u53d1\u9001\u3002\u8fd9\u65f6\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6eTCP_NODELAY\u9009\u9879\u6765\u7981\u7528TCP Nagle\u7b97\u6cd5\uff0c\u7acb\u5373\u53d1\u9001\u6570\u636e\u3002<\/p>\n

        \n
      1. \u51cf\u5c11\u9891\u7e41IO\u64cd\u4f5c<\/li>\n<\/ol>\n

        \u5728Redis\u4e2d\uff0c\u9891\u7e41\u7684IO\u64cd\u4f5c\u4f1a\u5927\u5927\u964d\u4f4e\u7cfb\u7edf\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5728\u7f16\u5199Redis\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f18\u5316\u534f\u8bae\uff0c\u5982\u5c06\u591a\u4e2a\u8bf7\u6c42\u5408\u5e76\u6210\u4e00\u4e2a\u8bf7\u6c42\u7b49\uff0c\u6765\u51cf\u5c11\u53d1\u9001\u7684\u6570\u636e\u91cf\u548c\u6b21\u6570\u3002\u540c\u65f6\uff0c\u5728\u5ba2\u6237\u7aef\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u65f6\uff0c\u4e5f\u53ef\u4ee5\u5c3d\u91cf\u51cf\u5c11\u5c0f\u4e8eMTU\u7684\u6570\u636e\u5305\u7684\u53d1\u9001\uff0c\u907f\u514d\u9891\u7e41\u89e6\u53d1IO\u64cd\u4f5c\u3002<\/p>\n

          \n
        1. \u4f7f\u7528\u8fde\u63a5\u6c60<\/li>\n<\/ol>\n

          \u5728Redis\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u8fde\u63a5\u6570\u91cf\u4f1a\u968f\u7740\u5e76\u53d1\u6570\u7684\u589e\u52a0\u800c\u589e\u52a0\uff0c\u5982\u679c\u6bcf\u6b21\u90fd\u91cd\u65b0\u5efa\u7acbTCP\u8fde\u63a5\uff0c\u4f1a\u5e26\u6765\u8f83\u5927\u7684\u7cfb\u7edf\u5f00\u9500\u3002\u6b64\u65f6\uff0c\u53ef\u91c7\u7528\u8fde\u63a5\u6c60\uff08Connection Pool\uff09\u6280\u672f\u3002\u8fde\u63a5\u6c60\u662f\u4e00\u79cd\u901a\u7528\u7684\u6280\u672f\uff0c\u5728\u9ad8\u5e76\u53d1\u7cfb\u7edf\u5f00\u53d1\u4e2d\u4e5f\u7ecf\u5e38\u88ab\u4f7f\u7528\u3002\u8fde\u63a5\u6c60\u53ef\u4ee5\u7ba1\u7406\u591a\u4e2a\u8fde\u63a5\uff0c\u91cd\u590d\u5229\u7528\u5df2\u6709\u7684\u8fde\u63a5\uff0c\u4ece\u800c\u907f\u514d\u9891\u7e41\u7684TCP\u8fde\u63a5\u7684\u5efa\u7acb\u548c\u9500\u6bc1\u3002<\/p>\n

            \n
          1. \u4f18\u5316\u5185\u5b58\u5206\u914d\u548c\u91ca\u653e<\/li>\n<\/ol>\n

            Redis\u7684\u5185\u5b58\u5206\u914d\u548c\u91ca\u653e\u662f\u5176\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u8981\u90e8\u5206\u3002\u91c7\u7528\u5e38\u89c1\u7684\u5185\u5b58\u6c60\u6280\u672f\uff0c\u53ef\u4ee5\u51cf\u5c11\u5185\u5b58\u5206\u914d\u548c\u91ca\u653e\u7684\u6b21\u6570\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u6027\u80fd\u3002Redis\u4e2d\uff0cstring\u7c7b\u578b\u5bf9\u5e94\u7684\u7f16\u7801\u65b9\u5f0f\u4e3aembstr\u6216raw\uff0craw\u7c7b\u578b\u4e0d\u4f1a\u4f7f\u7528\u5185\u5b58\u6c60\u6280\u672f\uff0c\u800cembstr\u7c7b\u578b\u5219\u4f1a\u4f7f\u7528\u5185\u5b58\u6c60\uff0c\u56e0\u6b64\u5e94\u5c3d\u91cf\u4f7f\u7528embstr\u7c7b\u578b\u5b58\u50a8\u6570\u636e\u3002<\/p>\n

              \n
            1. \u591a\u8fdb\u7a0b\u89e3\u51b3\u5355\u7ebf\u7a0bIO\u590d\u7528\u7684\u74f6\u9888<\/li>\n<\/ol>\n

              \u867d\u7136Redis\u91c7\u7528\u5355\u7ebf\u7a0b\u7684\u65b9\u5f0f\u63d0\u4f9b\u9ad8\u6027\u80fd\u7684IO\u64cd\u4f5c\uff0c\u4f46\u4e5f\u56e0\u6b64\u611f\u5230\u4e86\u5176\u74f6\u9888\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u901a\u8fc7\u591a\u8fdb\u7a0b\u7684\u65b9\u5f0f\uff0c\u5c06\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u5b88\u62a4\u8fdb\u7a0b\u7684\u529f\u80fd\u8fdb\u884c\u62c6\u5206\uff0c\u8ba9\u6bcf\u4e2a\u8fdb\u7a0b\u72ec\u7acb\u5904\u7406IO\u64cd\u4f5c\uff0c\u4ee5\u63d0\u9ad8\u7cfb\u7edf\u7684\u5e76\u53d1\u6027\u80fd\u3002<\/p>\n

              \u56db\u3001\u603b\u7ed3<\/p>\n

              Redis\u7684\u7f51\u7edcIO\u6a21\u578b\u91c7\u7528\u5355\u7ebf\u7a0b\u548c\u591a\u8def\u590d\u7528\u7ed3\u5408\u7684\u65b9\u5f0f\uff0c\u5176\u9ad8\u6548\u7684\u5b9e\u73b0\u65b9\u6848\u548c\u4f18\u5316\u65b9\u6cd5\u53ef\u4ee5\u4fdd\u8bc1\u7cfb\u7edf\u6027\u80fd\u7684\u9ad8\u6548\u6267\u884c\u3002\u5728\u5b9e\u9645\u5e94\u7528\u5f00\u53d1\u4e2d\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u60c5\u51b5\u6765\u9009\u62e9\u5408\u9002\u7684\u4f18\u5316\u65b9\u6cd5\uff0c\u6765\u8ba9Redis\u53d1\u6325\u51fa\u6700\u5927\u7684\u6f5c\u529b\u3002<\/p>\n

              \n
              \n <\/dt>\n
              \n Redis\u5b9e\u73b0\u4e3b\u4ece\u590d\u5236\u7684\u65b9\u6cd5\u662f\u4ec0\u4e48\n <\/dd>\n<\/dl>\n
              \n
              \n <\/dt>\n
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