{"id":201288,"date":"2025-05-10T08:22:18","date_gmt":"2025-05-10T00:22:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201288\/"},"modified":"2025-05-10T08:22:18","modified_gmt":"2025-05-10T00:22:18","slug":"redis%e7%bc%93%e5%ad%98io%e6%a8%a1%e5%9e%8b%e7%9a%84%e6%bc%94%e8%bf%9b%e6%95%99%e7%a8%8b%e7%a4%ba%e4%be%8b%e7%b2%be%e8%ae%b2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201288\/","title":{"rendered":"Redis\u7f13\u5b58IO\u6a21\u578b\u7684\u6f14\u8fdb\u6559\u7a0b\u793a\u4f8b\u7cbe\u8bb2"},"content":{"rendered":"

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

Redis\u7f13\u5b58IO\u6a21\u578b\u7684\u6f14\u8fdb\u6559\u7a0b\u793a\u4f8b\u7cbe\u8bb2<\/h1>\n

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

\u5bf9\u4e8e\u4e00\u4e2a\u6570\u636e\u5e93\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u7262\u56fa\u624e\u5b9e\u7684\u57fa\u7840\u662f\u5341\u5206\u91cd\u8981\u7684\uff0cgolang\u5b66\u4e60\u7f51\u5c31\u6765\u5e26\u5927\u5bb6\u4e00\u70b9\u70b9\u7684\u638c\u63e1\u57fa\u7840\u77e5\u8bc6\u70b9\u3002\u4eca\u5929\u672c\u7bc7\u6587\u7ae0\u5e26\u5927\u5bb6\u4e86\u89e3\u300aRedis\u7f13\u5b58IO\u6a21\u578b\u7684\u6f14\u8fdb\u6559\u7a0b\u793a\u4f8b\u7cbe\u8bb2\u300b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e86redisIO\u6a21\u578b\u3001\u6f14\u8fdb\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u5feb\u70b9\u6536\u85cf\u8d77\u6765\u5427\uff0c\u5426\u5219\u9700\u8981\u65f6\u5c31\u627e\u4e0d\u5230\u4e86\uff01<\/p>\n

\u7136\u800c\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\uff0c\u5355\u7ebf\u7a0b\u8d8a\u6765\u8d8a\u4e0d\u6ee1\u8db3\u4e00\u4e9b\u5e94\u7528\u573a\u666f\u4e86\uff0c\u6bd4\u5982\u9488\u5bf9\u5927key\u5220\u9664\u4f1a\u9020\u6210\u4e3b\u7ebf\u7a0b\u963b\u585e\u7684\u95ee\u9898\uff0credis4.0\u51fa\u4e86\u4e00\u4e2a\u5f02\u6b65\u7ebf\u7a0b\u3002<\/p>\n

\u9488\u5bf9\u5355\u7ebf\u7a0b\u7531\u4e8e\u65e0\u6cd5\u5229\u7528\u591a\u6838cpu\u7684\u7279\u6027\u800c\u5bfc\u81f4\u65e0\u6cd5\u6ee1\u8db3\u66f4\u9ad8\u7684\u5e76\u53d1\uff0credis6.0\u4e5f\u63a8\u51fa\u4e86\u591a\u7ebf\u7a0b\u6a21\u5f0f\u3002\u6240\u4ee5\u8bf4redis\u662f\u5355\u7ebf\u7a0b\u8d8a\u6765\u8d8a\u4e0d\u51c6\u786e\u4e86\u3002<\/p>\n

\u4e8b\u4ef6\u6a21\u578b<\/h2>\n

redis\u672c\u8eab\u662f\u4e2a\u4e8b\u4ef6\u9a71\u52a8\u7a0b\u5e8f\uff0c\u901a\u8fc7\u76d1\u542c\u6587\u4ef6\u4e8b\u4ef6\u548c\u65f6\u95f4\u4e8b\u4ef6\u6765\u5b8c\u6210\u76f8\u5e94\u7684\u529f\u80fd\u3002\u5176\u4e2d\u6587\u4ef6\u4e8b\u4ef6\u5176\u5b9e\u5c31\u662f\u5bf9socket\u7684\u62bd\u8c61\uff0c\u628a\u4e00\u4e2a\u4e2asocket\u4e8b\u4ef6\u62bd\u8c61\u6210\u6587\u4ef6\u4e8b\u4ef6\uff0credis\u57fa\u4e8eReactor\u6a21\u5f0f\u5f00\u53d1\u4e86\u81ea\u5df1\u7684\u7f51\u7edc\u4e8b\u4ef6\u5904\u7406\u5668\u3002\u90a3\u4e48Reactor\u6a21\u5f0f\u662f\u4ec0\u4e48\uff1f<\/p>\n

\u901a\u4fe1<\/h3>\n

\u601d\u8003\u4e00\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u7684\u670d\u52a1\u5668\u662f\u5982\u4f55\u6536\u5230\u6211\u4eec\u7684\u6570\u636e\u7684\uff1f\u9996\u5148\u53cc\u65b9\u5148\u8981\u5efa\u7acbTCP\u8fde\u63a5\uff0c\u8fde\u63a5\u5efa\u7acb\u4ee5\u540e\uff0c\u5c31\u53ef\u4ee5\u6536\u53d1\u6570\u636e\u4e86\u3002\u53d1\u9001\u65b9\u5411socket\u7684\u7f13\u51b2\u533a\u53d1\u9001\u6570\u636e\uff0c\u7b49\u5f85\u7cfb\u7edf\u4ece\u7f13\u51b2\u533a\u628a\u6570\u636e\u53d6\u8d70\uff0c\u7136\u540e\u901a\u8fc7\u7f51\u5361\u628a\u6570\u636e\u53d1\u51fa\u53bb\uff0c\u63a5\u6536\u65b9\u7684\u7f51\u5361\u5728\u6536\u5230\u6570\u636e\u4e4b\u540e\uff0c\u4f1a\u628a\u6570\u636ecopy\u5230socket\u7684\u7f13\u51b2\u533a\uff0c\u7136\u540e\u7b49\u5f85\u5e94\u7528\u7a0b\u5e8f\u6765\u53d6\uff0c\u8fd9\u662f\u5927\u6982\u7684\u53d1\u6536\u6570\u636e\u6d41\u7a0b\u3002<\/p>\n

<\/p>\n

copy\u6570\u636e\u7684\u5f00\u9500<\/h4>\n

\u56e0\u4e3a\u6d89\u53ca\u5230\u7cfb\u7edf\u8c03\u7528\uff0c\u6574\u4e2a\u8fc7\u7a0b\u53ef\u4ee5\u53d1\u73b0\u4e00\u4efd\u6570\u636e\u9700\u8981\u5148\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u5230\u5185\u6838\u6001\u7684socket\uff0c\u7136\u540e\u53c8\u8981\u4ece\u5185\u6838\u6001\u7684socket\u62f7\u8d1d\u5230\u7528\u6237\u6001\u7684\u8fdb\u7a0b\u4e2d\u53bb\uff0c\u8fd9\u5c31\u662f\u6570\u636e\u62f7\u8d1d\u7684\u5f00\u9500\u3002<\/p>\n

\u6570\u636e\u600e\u4e48\u77e5\u9053\u53d1\u7ed9\u54ea\u4e2asocket<\/h4>\n

\u5185\u6838\u7ef4\u62a4\u7684socket\u90a3\u4e48\u591a\uff0c\u7f51\u5361\u8fc7\u6765\u7684\u6570\u636e\u600e\u4e48\u77e5\u9053\u6295\u9012\u7ed9\u54ea\u4e2asocket\uff1f<\/p>\n

\u7b54\u6848\u662f\u7aef\u53e3\uff0csocket\u662f\u4e00\u4e2a\u56db\u5143\u7ec4\uff1a<\/p>\n

\n

ip\uff08client\uff09+ port\uff08client\uff09+ip\uff08server\uff09+port\uff08server\uff09<\/p>\n<\/blockquote>\n

\u6ce8\u610f\u5343\u4e07\u4e0d\u8981\u8bf4\u4e00\u53f0\u673a\u5668\u7684\u7406\u8bba\u6700\u5927\u5e76\u53d1\u662f65535\u4e2a\uff0c\u9664\u4e86\u7aef\u53e3\uff0c\u8fd8\u6709ip\uff0c\u5e94\u8be5\u662f\u7aef\u53e3\u6570*ip\u6570<\/p>\n

\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u4e00\u53f0\u7535\u8111\u53ef\u4ee5\u540c\u65f6\u6253\u5f00\u591a\u4e2a\u8f6f\u4ef6\u7684\u539f\u56e0\u3002<\/p>\n

socket\u7684\u6570\u636e\u600e\u4e48\u901a\u77e5\u7a0b\u5e8f\u6765\u53d6<\/h4>\n

\u5f53\u6570\u636e\u5df2\u7ecf\u4ece\u7f51\u5361copy\u5230\u4e86\u5bf9\u5e94\u7684socket\u7f13\u51b2\u533a\u4e2d\uff0c\u600e\u4e48\u901a\u77e5\u7a0b\u5e8f\u6765\u53d6\uff1f\u5047\u5982socket\u6570\u636e\u8fd8\u6ca1\u5230\u8fbe\uff0c\u8fd9\u65f6\u7a0b\u5e8f\u5728\u5e72\u561b\uff1f\u8fd9\u91cc\u5176\u5b9e\u6d89\u53ca\u5230cpu\u5bf9\u8fdb\u7a0b\u7684\u8c03\u5ea6\u7684\u95ee\u9898\u3002\u4ececpu\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u8fdb\u7a0b\u5b58\u5728\u8fd0\u884c\u6001\u3001\u5c31\u7eea\u6001\u3001\u963b\u585e\u6001\u3002<\/p>\n

    \n
  • \u5c31\u7eea\u6001\uff1a\u8fdb\u7a0b\u7b49\u5f85\u88ab\u6267\u884c\uff0c\u8d44\u6e90\u90fd\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\uff0c\u5269\u4e0b\u7684\u5c31\u7b49\u5f85cpu\u7684\u8c03\u5ea6\u4e86\u3002<\/li>\n
  • \u8fd0\u884c\u6001\uff1a\u6b63\u5728\u8fd0\u884c\u7684\u8fdb\u7a0b\uff0ccpu\u6b63\u5728\u8c03\u5ea6\u7684\u8fdb\u7a0b\u3002<\/li>\n
  • \u963b\u585e\u6001\uff1a\u56e0\u4e3a\u67d0\u4e9b\u60c5\u51b5\u5bfc\u81f4\u963b\u585e\uff0c\u4e0d\u5360\u6709cpu\uff0c\u6b63\u5728\u7b49\u5f85\u67d0\u4e9b\u4e8b\u4ef6\u7684\u5b8c\u6210\u3002<\/li>\n<\/ul>\n

    \u5f53\u5b58\u5728\u591a\u4e2a\u8fd0\u884c\u6001\u7684\u8fdb\u7a0b\u65f6\uff0c\u7531\u4e8ecpu\u7684\u65f6\u95f4\u7247\u6280\u672f\uff0c\u8fd0\u884c\u6001\u7684\u8fdb\u7a0b\u90fd\u4f1a\u88abcpu\u6267\u884c\u4e00\u6bb5\u65f6\u95f4\uff0c\u770b\u7740\u597d\u4f3c\u540c\u65f6\u8fd0\u884c\u4e00\u6837\uff0c\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u5e76\u53d1\u3002\u5f53\u6211\u4eec\u521b\u5efa\u4e00\u4e2asocket\u8fde\u63a5\u65f6\uff0c\u5b83\u5927\u6982\u4f1a\u8fd9\u6837\uff1a<\/p>\n

    \nsockfd = socket(AF_INET, SOCK_STREAM, 0)\nconnect(sockfd, ....)\nrecv(sockfd, ...)\ndoSometing()<\/pre>\n
    \u64cd\u4f5c\u7cfb\u7edf\u4f1a\u4e3a\u6bcf\u4e2asocket\u5efa\u7acb\u4e00\u4e2afd\u53e5\u67c4\uff0c\u8fd9\u4e2afd\u5c31\u6307\u5411\u6211\u4eec\u521b\u5efa\u7684socket\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5305\u542b\u7f13\u51b2\u533a\u3001\u8fdb\u7a0b\u7684\u7b49\u5f85\u961f\u5217…\u3002\u5bf9\u4e8e\u4e00\u4e2a\u521b\u5efasocket\u7684\u8fdb\u7a0b\u6765\u8bf4\uff0c\u5982\u679c\u6570\u636e\u6ca1\u5230\u8fbe\uff0c\u90a3\u4e48\u4ed6\u4f1a\u5361\u5728recv\u5904\uff0c\u8fd9\u4e2a\u8fdb\u7a0b\u4f1a\u6302\u5728socket\u5bf9\u8c61\u7684\u7b49\u5f85\u961f\u5217\u4e2d\uff0c\u5bf9cpu\u6765\u8bf4\uff0c\u8fd9\u4e2a\u8fdb\u7a0b\u5c31\u662f\u963b\u585e\u7684\uff0c\u5b83\u5176\u5b9e\u4e0d\u5360\u6709cpu\uff0c\u5b83\u5728\u7b49\u5f85\u6570\u636e\u7684\u5230\u6765\u3002<\/p>\n
    <\/p>\n
    \u5f53\u6570\u636e\u5230\u6765\u65f6\uff0c\u7f51\u5361\u4f1a\u544a\u8bc9cpu\uff0ccpu\u6267\u884c\u4e2d\u65ad\u7a0b\u5e8f\uff0c\u628a\u7f51\u5361\u7684\u6570\u636ecopy\u5230\u5bf9\u5e94\u7684socket\u7684\u7f13\u51b2\u533a\u4e2d\uff0c\u7136\u540e\u5524\u9192\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u8fdb\u7a0b\uff0c\u628a\u8fd9\u4e2a\u8fdb\u7a0b\u91cd\u65b0\u653e\u56de\u8fd0\u884c\u961f\u5217\u4e2d\uff0c\u5f53\u8fd9\u4e2a\u8fdb\u7a0b\u88abcpu\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u5b83\u5c31\u53ef\u4ee5\u6267\u884c\u6700\u540e\u7684\u8bfb\u53d6\u64cd\u4f5c\u4e86\u3002\u8fd9\u79cd\u6a21\u5f0f\u6709\u4e24\u4e2a\u95ee\u9898\uff1a<\/p>\n
    recv\u53ea\u80fd\u63a5\u6536\u4e00\u4e2afd\uff0c\u5982\u679c\u8981recv\u591a\u4e2afd\u600e\u4e48\u529e\uff1f<\/p>\n
    \u901a\u8fc7while\u5faa\u73af\u6548\u7387\u7a0d\u4f4e\u3002<\/p>\n
    \u8fdb\u7a0b\u9664\u4e86\u8bfb\u53d6\u6570\u636e\uff0c\u8fd8\u8981\u5904\u7406\u63a5\u4e0b\u91cc\u7684\u903b\u8f91\uff0c\u5728\u6570\u636e\u6ca1\u5230\u8fbe\u65f6\uff0c\u8fdb\u7a0b\u5904\u4e8e\u963b\u585e\u6001\uff0c\u5373\u4f7f\u7528\u4e86while\u5faa\u73af\u6765\u76d1\u542c\u591a\u4e2afd\uff0c\u5176\u5b83\u7684socket\u662f\u4e0d\u662f\u56e0\u4e3a\u5176\u4e2d\u4e00\u4e2arecv\u963b\u585e\uff0c\u800c\u5bfc\u81f4\u6574\u4e2a\u8fdb\u7a0b\u7684\u963b\u585e\u3002<\/p>\n
    \u9488\u5bf9\u4e0a\u8ff0\u95ee\u9898\uff0c\u4e8e\u662fReactor\u6a21\u5f0f\u548cIO\u591a\u8def\u590d\u7528\u6280\u672f\u51fa\u73b0\u4e86\u3002<\/p>\n
    Reactor<\/h3>\n
    Reactor\u662f\u4e00\u79cd\u9ad8\u6027\u80fd\u5904\u7406IO\u7684\u6a21\u5f0f\uff0cReactor\u6a21\u5f0f\u4e0b\u4e3b\u7a0b\u5e8f\u53ea\u8d1f\u8d23\u76d1\u542c\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u662f\u5426\u6709\u4e8b\u4ef6\u53d1\u751f\uff0c\u8fd9\u4e00\u70b9\u5f88\u91cd\u8981\uff0c\u4e3b\u7a0b\u5e8f\u5e76\u4e0d\u5904\u7406\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u5199\u3002\u90a3\u4e48\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u53ef\u8bfb\u53ef\u5199\u8c01\u6765\u505a\uff1f\u7b54\u6848\u662f\u5176\u4ed6\u7684\u5de5\u4f5c\u7a0b\u5e8f\uff0c\u5f53\u67d0\u4e2asocket\u53d1\u751f\u53ef\u8bfb\u53ef\u5199\u7684\u4e8b\u4ef6\u540e\uff0c\u4e3b\u7a0b\u5e8f\u4f1a\u901a\u77e5\u5de5\u4f5c\u7a0b\u5e8f\uff0c\u771f\u6b63\u4ecesocket\u91cc\u9762\u8bfb\u53d6\u6570\u636e\u548c\u5199\u5165\u6570\u636e\u7684\u662f\u5de5\u4f5c\u7a0b\u5e8f\u3002\u8fd9\u79cd\u6a21\u5f0f\u7684\u597d\u5904\u5c31\u662f\u5c31\u662f\u4e3b\u7a0b\u5e8f\u53ef\u4ee5\u625b\u5e76\u53d1\uff0c\u4e0d\u963b\u585e\uff0c\u4e3b\u7a0b\u5e8f\u975e\u5e38\u7684\u8f7b\u4fbf\u3002\u4e8b\u4ef6\u53ef\u4ee5\u901a\u8fc7\u961f\u5217\u7684\u65b9\u5f0f\u7b49\u5f85\u88ab\u5de5\u4f5c\u7a0b\u5e8f\u6267\u884c\u3002\u901a\u8fc7Reactor\u6a21\u5f0f\uff0c\u6211\u4eec\u53ea\u9700\u8981\u628a\u4e8b\u4ef6\u548c\u4e8b\u4ef6\u5bf9\u5e94\u7684handler\uff08callback func\uff09\uff0c\u6ce8\u518c\u5230Reactor\u4e2d\u5c31\u884c\u4e86\uff0c\u6bd4\u5982\uff1a<\/p>\n
    \ntype Reactor interface{\n   RegisterHandler(WriteCallback func(), \"writeEvent\");\n   RegisterHandler(ReadCallback func(), \"readEvent\");\n}<\/pre>\n
    \u5f53\u4e00\u4e2a\u5ba2\u6237\u7aef\u5411redis\u53d1\u8d77set key value\u7684\u547d\u4ee4\uff0c\u8fd9\u65f6\u5019\u4f1a\u5411socket\u7f13\u51b2\u533a\u5199\u5165\u8fd9\u6837\u7684\u547d\u4ee4\u8bf7\u6c42\uff0c\u5f53Reactor\u76d1\u542c\u5230\u5bf9\u5e94\u7684socket\u7f13\u51b2\u533a\u6709\u6570\u636e\u4e86\uff0c\u90a3\u4e48\u6b64\u65f6\u7684socket\u662f\u53ef\u8bfb\u7684\uff0cReactor\u5c31\u4f1a\u89e6\u53d1\u8bfb\u4e8b\u4ef6\uff0c\u901a\u8fc7\u4e8b\u5148\u6ce8\u5165\u7684ReadCallback\u56de\u8c03\u51fd\u6570\u6765\u5b8c\u6210\u547d\u4ee4\u7684\u89e3\u6790\u3001\u547d\u4ee4\u7684\u6267\u884c\u3002\u5f53socket\u7684\u7f13\u51b2\u533a\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u53ef\u4ee5\u88ab\u5199\uff0c\u90a3\u4e48\u5bf9\u5e94\u7684Reactor\u5c31\u4f1a\u4ea7\u751f\u53ef\u5199\u4e8b\u4ef6\uff0c\u6b64\u65f6\u5c31\u4f1a\u6267\u884c\u4e8b\u5148\u6ce8\u5165\u7684WriteCallback\u56de\u8c03\u51fd\u6570\u3002\u5f53\u53d1\u8d77\u7684set key value\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u6b64\u65f6\u5de5\u4f5c\u7a0b\u5e8f\u4f1a\u5411socket\u7f13\u51b2\u533a\u4e2d\u5199\u5165OK\uff0c\u6700\u540e\u5ba2\u6237\u7aef\u4f1a\u4ecesocket\u7f13\u51b2\u533a\u4e2d\u53d6\u8d70\u5199\u5165\u7684OK\u3002\u5728redis\u4e2d\u4e0d\u7ba1\u662fReadCallback\uff0c\u8fd8\u662fWriteCallback\uff0c\u5b83\u4eec\u90fd\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5b8c\u6210\u7684\uff0c\u5982\u679c\u5b83\u4eec\u540c\u65f6\u5230\u8fbe\u90a3\u4e48\u4e5f\u5f97\u6392\u961f\uff0c\u8fd9\u5c31\u662fredis6.0\u4e4b\u524d\u7684\u9ed8\u8ba4\u6a21\u5f0f\uff0c\u4e5f\u662f\u6700\u5e7f\u4e3a\u6d41\u4f20\u7684\u5355\u7ebf\u7a0bredis\u3002<\/p>\n
    \u6574\u4e2a\u6d41\u7a0b\u4e0b\u6765\u53ef\u4ee5\u53d1\u73b0Reactor\u4e3b\u7a0b\u5e8f\u975e\u5e38\u5feb\uff0c\u56e0\u4e3a\u5b83\u4e0d\u9700\u8981\u6267\u884c\u771f\u6b63\u7684\u8bfb\u5199\uff0c\u5269\u4e0b\u7684\u90fd\u662f\u5de5\u4f5c\u7a0b\u5e8f\u5e72\u7684\u4e8b\uff1aIO\u7684\u8bfb\u5199\u3001\u547d\u4ee4\u7684\u89e3\u6790\u3001\u547d\u4ee4\u7684\u6267\u884c\u3001\u7ed3\u679c\u7684\u8fd4\u56de..\uff0c\u8fd9\u4e00\u70b9\u5f88\u91cd\u8981\u3002<\/p>\n
    IO\u591a\u8def\u590d\u7528\u5668<\/h3>\n
    \u901a\u8fc7\u4e0a\u9762\u6211\u4eec\u77e5\u9053Reactor\u5b83\u662f\u4e00\u4e2a\u62bd\u8c61\u7684\u7406\u8bba\uff0c\u662f\u4e00\u4e2a\u6a21\u5f0f\uff0c\u5982\u4f55\u5b9e\u73b0\u5b83\uff1f\u5982\u4f55\u76d1\u542csocket\u4e8b\u4ef6\u7684\u5230\u6765\uff1f\u3002\u6700\u7b80\u5355\u7684\u529e\u6cd5\u5c31\u662f\u8f6e\u8be2\uff0c\u6211\u4eec\u65e2\u7136\u4e0d\u77e5\u9053socket\u4e8b\u4ef6\u4ec0\u4e48\u65f6\u5019\u5230\u8fbe\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u4e00\u76f4\u6765\u95ee\u5185\u6838\uff0c\u5047\u8bbe\u73b0\u5728\u67091w\u4e2asocket\u8fde\u63a5\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u5f97\u5faa\u73af\u95ee\u5185\u68381w\u6b21\uff0c\u8fd9\u4e2a\u5f00\u9500\u660e\u663e\u5f88\u5927\u3002<\/p>\n
    \u7528\u6237\u6001\u5230\u5185\u6838\u6001\u7684\u5207\u6362\uff0c\u6d89\u53ca\u5230\u4e0a\u4e0b\u6587\u7684\u5207\u6362\uff08context\uff09\uff0ccpu\u9700\u8981\u4fdd\u62a4\u73b0\u573a\uff0c\u5728\u8fdb\u5165\u5185\u6838\u524d\u9700\u8981\u4fdd\u5b58\u5bc4\u5b58\u5668\u7684\u72b6\u6001\uff0c\u5728\u5185\u6838\u8fd4\u56de\u540e\u8fd8\u9700\u8981\u4ece\u5bc4\u5b58\u5668\u91cc\u6062\u590d\u72b6\u6001\uff0c\u8fd9\u662f\u4e2a\u4e0d\u5c0f\u7684\u5f00\u9500\u3002<\/p>\n
    \u7531\u4e8e\u4f20\u7edf\u7684\u8f6e\u8be2\u65b9\u6cd5\u5f00\u9500\u8fc7\u5927\uff0c\u4e8e\u662fIO\u591a\u8def\u590d\u7528\u590d\u7528\u5668\u51fa\u73b0\u4e86\uff0cIO\u591a\u8def\u590d\u7528\u5668\u6709select\u3001poll\u3001evport\u3001kqueue\u3001epoll\u3002Redis\u5728I\/O\u591a\u8def\u590d\u7528\u7a0b\u5e8f\u7684\u5b9e\u73b0\u6e90\u7801\u4e2d\u7528#include\u5b8f\u5b9a\u4e49\u4e86\u76f8\u5e94\u7684\u89c4\u5219\uff0c\u7a0b\u5e8f\u4f1a\u5728\u7f16\u8bd1\u65f6\u81ea\u52a8\u9009\u62e9\u7cfb\u7edf\u4e2d\u6027\u80fd\u6700\u9ad8\u7684I\/O\u591a\u8def\u590d\u7528\u51fd\u6570\u5e93\u6765\u4f5c\u4e3aRedis\u7684I\/O\u591a\u8def\u590d\u7528\u7a0b\u5e8f\u7684\u5e95\u5c42\u5b9e\u73b0\uff1a<\/p>\n
    \n\/\/ Include the best multiplexing layer supported by this system. The following should be ordered by performances, descending.\n# ifdef HAVE_EVPORT\n# include \"ae_evport.c\"\n# else\n    # ifdef HAVE_EPOLL\n    # include \"ae_epoll.c\"\n    # else\n        # ifdef HAVE_KQUEUE\n        # include \"ae_kqueue.c\"\n        # else\n        # include \"ae_select.c\"\n        # endif\n    # endif\n# endif\n <\/pre>\n
    \u6211\u4eec\u8fd9\u91cc\u4e3b\u8981\u4ecb\u7ecd\u4e24\u79cd\u975e\u5e38\u7ecf\u5178\u7684\u590d\u7528\u5668select\u548cepoll\uff0cselect\u662fIO\u591a\u8def\u590d\u7528\u5668\u7684\u521d\u4ee3\uff0cselect\u662f\u5982\u4f55\u89e3\u51b3\u4e0d\u505c\u5730\u4ece\u7528\u6237\u6001\u5230\u5185\u6838\u6001\u7684\u8f6e\u8be2\u95ee\u9898\u7684\uff1f<\/p>\n
    select<\/h4>\n
    \u65e2\u7136\u6bcf\u6b21\u8f6e\u8be2\u5f88\u9ebb\u70e6\uff0c\u90a3\u4e48select\u5c31\u628a\u4e00\u6279socket\u7684fds\u96c6\u5408\u4e00\u6b21\u6027\u4ea4\u7ed9\u5185\u6838\uff0c\u7136\u540e\u5185\u6838\u81ea\u5df1\u904d\u5386fds\uff0c\u7136\u540e\u5224\u65ad\u6bcf\u4e2afd\u7684\u53ef\u8bfb\u53ef\u5199\u72b6\u6001\uff0c\u5f53\u67d0\u4e2afd\u7684\u72b6\u6001\u6ee1\u8db3\u65f6\uff0c\u7531\u7528\u6237\u81ea\u5df1\u5224\u65ad\u53bb\u83b7\u53d6\u3002<\/p>\n
    \nfds = []int{fd1,fd2,...}\nfor {\n select (fds)\n for i:= 0; i \n\n
    select\u7684\u7f3a\u70b9\uff1a\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u76d1\u542c\u591a\u4e2asocket\u7684\u65f6\u5019\uff0c\u901a\u8fc7select\u4f1a\u628a\u5185\u6838\u4e2d\u6240\u6709\u7684socket\u7684\u7b49\u5f85\u961f\u5217\u90fd\u52a0\u4e0a\u672c\u8fdb\u7a0b\uff08\u591a\u5bf9\u4e00\uff09\uff0c\u8fd9\u6837\u5f53\u5176\u4e2d\u4e00\u4e2asocket\u6709\u6570\u636e\u7684\u65f6\u5019\uff0c\u5b83\u5c31\u4f1a\u628a\u544a\u8bc9cpu\uff0c\u540c\u65f6\u628a\u8fd9\u4e2a\u8fdb\u7a0b\u4ece\u963b\u585e\u6001\u5524\u9192\uff0c\u7b49\u5f85\u88abcpu\u7684\u8c03\u5ea6\uff0c\u540c\u65f6\u4f1a\u628a\u8fdb\u7a0b\u4ece\u6240\u6709\u7684socket\u7684\u7b49\u5f85\u961f\u5217\u4e2d\u79fb\u9664\uff0c\u5f53cpu\u8fd0\u884c\u8fd9\u4e2a\u8fdb\u7a0b\u7684\u65f6\u5019\uff0c\u8fdb\u7a0b\u56e0\u4e3a\u672c\u8eab\u4f20\u8fdb\u53bb\u4e86\u4e00\u6279fds\u96c6\u5408\uff0c\u6211\u4eec\u5e76\u4e0d\u77e5\u9053\u54ea\u4e2afd\u6765\u6570\u636e\u4e86\uff0c\u6240\u4ee5\u53ea\u80fd\u90fd\u904d\u5386\u4e00\u6b21\uff0c\u8fd9\u6837\u5bf9\u4e8e\u6ca1\u6709\u6570\u636e\u5230\u6765\u7684fd\u6765\u8bf4\uff0c\u5c31\u767d\u767d\u6d6a\u8d39\u4e86\u3002\u7531\u4e8e\u6bcf\u6b21select\u8981\u904d\u5386socket\u96c6\u5408\uff0c\u90a3\u4e48\u8fd9\u4e2asocket\u96c6\u5408\u7684\u6570\u91cf\u8fc7\u5927\u5c31\u4f1a\u5f71\u54cd\u6574\u4f53\u6548\u7387\uff0c\u8fd9\u539f\u56e0\u4e5f\u662fselect\u4e3a\u4ec0\u4e48\u652f\u6301\u6700\u59271024\u4e2a\u5e76\u53d1\u7684\u3002<\/p>\n
    epoll<\/h4>\n
    \u5982\u679c\u6709\u4e00\u79cd\u65b9\u6cd5\u4f7f\u5f97\u4e0d\u7528\u904d\u5386\u6240\u6709\u7684socket\uff0c\u5f53\u67d0\u4e2asocket\u7684\u6d88\u606f\u5230\u6765\u65f6\uff0c\u53ea\u9700\u8981\u89e6\u53d1\u5bf9\u5e94\u7684socket fd\uff0c\u800c\u4e0d\u7528\u76f2\u76ee\u7684\u8f6e\u8be2\uff0c\u90a3\u6548\u7387\u662f\u4e0d\u662f\u4f1a\u66f4\u9ad8\u3002epoll\u7684\u51fa\u73b0\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1a<\/p>\n\n
    \nepfd = epoll_create()\nepoll_ctl(epfd, fd1, fd2...)\nfor {\n  epoll_wait()\n  for fd := range fds {\n    doSomething()\n  }\n}<\/pre>\n
      \n
    • \u9996\u5148\u901a\u8fc7epoll_create\u521b\u5efa\u4e00\u4e2aepoll\u5bf9\u8c61\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2afd\u53e5\u67c4\uff0c\u548csocket\u7684\u53e5\u67c4\u4e00\u6837\uff0c\u4e5f\u662f\u7ba1\u7406\u5728fds\u96c6\u5408\u4e0b\u3002<\/li>\n
    • \u901a\u8fc7epoll_ctl\uff0c\u628a\u9700\u8981\u76d1\u542c\u7684socket fd\u548cepoll\u5bf9\u8c61\u7ed1\u5b9a\u3002<\/li>\n
    • \u901a\u8fc7epoll_wait\u6765\u83b7\u53d6\u6709\u6570\u636e\u7684socket fd\uff0c\u5f53\u6ca1\u6709\u4e00\u4e2asocket\u6709\u6570\u636e\u7684\u65f6\u5019\uff0c\u90a3\u4e48\u6b64\u5904\u4f1a\u963b\u585e\uff0c\u6709\u6570\u636e\u7684\u8bdd\uff0c\u90a3\u4e48\u5c31\u4f1a\u8fd4\u56de\u6709\u6570\u636e\u7684fds\u96c6\u5408\u3002<\/li>\n<\/ul>\n
      epoll\u662f\u600e\u4e48\u505a\u5230\u7684\uff1f<\/h4>\n
      \u9996\u5148\u5185\u6838\u7684socket\u4e0d\u5728\u548c\u7528\u6237\u7684\u8fdb\u7a0b\u7ed1\u5b9a\u4e86\uff0c\u800c\u662f\u548cepoll\u7ed1\u5b9a\uff0c\u8fd9\u6837\u5f53socket\u7684\u6570\u636e\u5230\u6765\u65f6\uff0c\u4e2d\u65ad\u7a0b\u5e8f\u5c31\u4f1a\u7ed9epoll\u7684\u4e00\u4e2a\u5c31\u7eea\u5bf9\u5217\u6dfb\u52a0\u5bf9\u5e94socket fd\uff0c\u8fd9\u4e2a\u961f\u5217\u91cc\u90fd\u662f\u6709\u6570\u636e\u7684socket\uff0c\u7136\u540e\u548cepoll\u5173\u8054\u7684\u8fdb\u7a0b\u4e5f\u4f1a\u88ab\u5524\u9192\uff0c\u5f53cpu\u8fd0\u884c\u8fdb\u7a0b\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u4eceepoll\u7684\u5c31\u7eea\u961f\u5217\u4e2d\u83b7\u53d6\u6709\u4e8b\u4ef6\u7684socket\uff0c\u6267\u884c\u63a5\u4e0b\u6765\u7684\u8bfb\u3002\u6574\u4e2a\u6d41\u7a0b\u4e0b\u6765\uff0c\u53ef\u4ee5\u53d1\u73b0\u7528\u6237\u7a0b\u5e8f\u4e0d\u7528\u65e0\u8111\u904d\u5386\uff0c\u5185\u6838\u4e5f\u4e0d\u7528\u904d\u5386\uff0c\u901a\u8fc7\u4e2d\u65ad\u505a\u5230”\u8c01\u6709\u6570\u636e\u5904\u7406\u8c01”\u7684\u9ad8\u6548\u8868\u73b0\u3002<\/p>\n
      <\/p>\n
      \u5355\u7ebf\u7a0b\u5230\u591a\u7ebf\u7a0b\u7684\u6f14\u8fdb<\/h2>\n
      \u5355\u7ebf\u7a0b<\/h3>\n
      \u7ed3\u5408Reactor\u7684\u601d\u60f3\u52a0\u4e0a\u9ad8\u6027\u80fdepoll IO\u6a21\u5f0f\uff0credis\u5f00\u53d1\u51fa\u4e00\u5957\u9ad8\u6027\u80fd\u7684\u7f51\u7edcIO\u67b6\u6784\uff1a\u5355\u7ebf\u7a0b\u7684IO\u591a\u8def\u590d\u7528\uff0cIO\u591a\u8def\u590d\u7528\u5668\u8d1f\u8d23\u63a5\u53d7\u7f51\u7edcIO\u4e8b\u4ef6\uff0c\u4e8b\u4ef6\u6700\u7ec8\u4ee5\u961f\u5217\u7684\u65b9\u5f0f\u6392\u961f\u7b49\u5f85\u88ab\u5904\u7406\uff0c\u8fd9\u662f\u6700\u539f\u59cb\u7684\u5355\u7ebf\u7a0b\u6a21\u578b\uff0c\u4e3a\u4ec0\u4e48\u4f7f\u7528\u5355\u7ebf\u7a0b\uff1f\u56e0\u4e3a\u5355\u7ebf\u7a0b\u7684redis\u5df2\u7ecf\u53ef\u4ee5\u8fbe\u523010w qps\u7684\u8d1f\u8f7d\uff08\u5982\u679c\u505a\u4e00\u4e9b\u590d\u6742\u7684\u96c6\u5408\u64cd\u4f5c\uff0c\u4f1a\u964d\u4f4e\uff09\uff0c\u6ee1\u8db3\u7edd\u5927\u90e8\u5206\u5e94\u7528\u573a\u666f\u4e86\uff0c\u540c\u65f6\u5355\u7ebf\u7a0b\u4e0d\u7528\u8003\u8651\u591a\u7ebf\u7a0b\u5e26\u6765\u7684\u9501\u7684\u95ee\u9898\uff0c\u5982\u679c\u8fd8\u6ca1\u8fbe\u5230\u4f60\u7684\u8981\u6c42\uff0c\u90a3\u4e48\u4f60\u4e5f\u53ef\u4ee5\u914d\u7f6e\u5206\u7247\u6a21\u5f0f\uff0c\u8ba9\u4e0d\u540c\u7684\u8282\u70b9\u5904\u7406\u4e0d\u540c\u7684sharding key\uff0c\u8fd9\u6837\u4f60\u7684redis server\u7684\u8d1f\u8f7d\u80fd\u529b\u5c31\u80fd\u968f\u7740\u8282\u70b9\u7684\u589e\u957f\u800c\u8fdb\u4e00\u6b65\u7ebf\u6027\u589e\u957f\u3002<\/p>\n
      \u5f02\u6b65\u7ebf\u7a0b<\/h3>\n
      \u5728\u5355\u7ebf\u7a0b\u6a21\u5f0f\u4e0b\u6709\u8fd9\u6837\u4e00\u4e2a\u95ee\u9898\uff0c\u5f53\u6267\u884c\u5220\u9664\u67d0\u4e2a\u5f88\u5927\u7684\u96c6\u5408\u6216\u8005hash\u7684\u65f6\u5019\u4f1a\u5f88\u8017\u65f6\uff08\u4e0d\u662f\u8fde\u7eed\u5185\u5b58\uff09\uff0c\u90a3\u4e48\u5355\u7ebf\u7a0b\u7684\u8868\u73b0\u5c31\u662f\u5176\u4ed6\u8fd8\u5728\u6392\u961f\u7684\u547d\u4ee4\u5c31\u5f97\u7b49\u5f85\u3002\u5f53\u7b49\u5f85\u7684\u547d\u4ee4\u8d8a\u6765\u8d8a\u591a\uff0c\u90a3\u4e48\u4e0d\u597d\u7684\u4e8b\u60c5\u5c31\u4f1a\u53d1\u751f\u3002\u4e8e\u662fredis4.0\u9488\u5bf9\u5927key\u5220\u9664\u7684\u60c5\u51b5\uff0c\u51fa\u4e86\u4e2a\u5f02\u6b65\u7ebf\u7a0b\u3002\u7528unlink\u4ee3\u66ffdel\u53bb\u6267\u884c\u5220\u9664\uff0c\u8fd9\u6837\u5f53\u6211\u4eecunlink\u7684\u65f6\u5019\uff0credis\u4f1a\u68c0\u6d4b\u5f53\u5220\u9664\u7684key\u662f\u5426\u9700\u8981\u653e\u5230\u5f02\u6b65\u7ebf\u7a0b\u53bb\u6267\u884c\uff08\u6bd4\u5982\u96c6\u5408\u7684\u6570\u91cf\u8d85\u8fc764\u4e2a…\uff09\uff0c\u5982\u679cvalue\u8db3\u591f\u5927\uff0c\u90a3\u4e48\u5c31\u4f1a\u653e\u5230\u5f02\u6b65\u7ebf\u7a0b\u91cc\u53bb\u5904\u7406\uff0c\u4e0d\u4f1a\u5f71\u54cd\u4e3b\u7ebf\u7a0b\u3002\u540c\u6837\u7684\u8fd8\u6709flushall\u3001flushdb\u90fd\u652f\u6301\u5f02\u6b65\u6a21\u5f0f\u3002\u6b64\u5916redis\u8fd8\u652f\u6301\u67d0\u4e9b\u573a\u666f\u4e0b\u662f\u5426\u9700\u8981\u5f02\u6b65\u7ebf\u7a0b\u6765\u5904\u7406\u7684\u6a21\u5f0f\uff08\u9ed8\u8ba4\u662f\u5173\u95ed\u7684\uff09\uff1a<\/p>\n
      \nlazyfree-lazy-eviction no\nlazyfree-lazy-expire no\nlazyfree-lazy-server-del no\nreplica-lazy-flush no<\/pre>\n
      lazyfree-lazy-eviction<\/code>\uff1a\u9488\u5bf9redis\u6709\u8bbe\u7f6e\u5185\u5b58\u8fbe\u5230maxmemory\u7684\u6dd8\u6c70\u7b56\u7565\u65f6\uff0c\u8fd9\u65f6\u5019\u4f1a\u542f\u52a8\u5f02\u6b65\u5220\u9664\uff0c\u6b64\u573a\u666f\u5f02\u6b65\u5220\u9664\u7684\u7f3a\u70b9\u5c31\u662f\u5982\u679c\u5220\u9664\u4e0d\u53ca\u65f6\uff0c\u5185\u5b58\u4e0d\u80fd\u5f97\u5230\u53ca\u65f6\u91ca\u653e\u3002<\/p>\n
      lazyfree-lazy-expire<\/code>\uff1a\u5bf9\u4e8e\u6709ttl\u7684key\uff0c\u5728\u88abredis\u6e05\u7406\u7684\u65f6\u5019\uff0c\u4e0d\u6267\u884c\u540c\u6b65\u5220\u9664\uff0c\u52a0\u5165\u5f02\u6b65\u7ebf\u7a0b\u6765\u5220\u9664\u3002<\/p>\n
      replica-lazy-flush<\/code>\uff1a\u5728slave\u8282\u70b9\u52a0\u5165\u8fdb\u6765\u7684\u65f6\u5019\uff0c\u4f1a\u6267\u884cflush\u6e05\u7a7a\u81ea\u5df1\u7684\u6570\u636e\uff0c\u5982\u679cflush\u8017\u65f6\u8f83\u4e45\uff0c\u90a3\u4e48\u590d\u5236\u7f13\u51b2\u533a\u5806\u79ef\u7684\u6570\u636e\u5c31\u8d8a\u591a\uff0c\u540e\u9762slave\u540c\u6b65\u6570\u636e\u8f83\u76f8\u5bf9\u6162\uff0c\u5f00\u542freplica-lazy-flush\u540e\uff0cslave\u7684flush\u53ef\u4ee5\u4ea4\u7531\u5f02\u6b65\u73b0\u6210\u6765\u5904\u7406\uff0c\u4ece\u800c\u63d0\u9ad8\u540c\u6b65\u7684\u901f\u5ea6\u3002<\/p>\n
      lazyfree-lazy-server-del<\/code>\uff1a\u8fd9\u4e2a\u9009\u9879\u662f\u9488\u5bf9\u4e00\u4e9b\u6307\u4ee4\uff0c\u6bd4\u5982rename\u4e00\u4e2a\u5b57\u6bb5\u7684\u65f6\u5019\u6267\u884cRENAME key newkey, \u5982\u679c\u8fd9\u65f6newkey\u662fb\u5b58\u5728\u7684\uff0c\u5bf9\u4e8erename\u6765\u8bf4\u5b83\u5c31\u8981\u5220\u9664\u8fd9\u4e2anewkey\u539f\u6765\u7684\u8001\u503c\uff0c\u5982\u679c\u8fd9\u4e2a\u8001\u503c\u5f88\u5927\uff0c\u90a3\u4e48\u5c31\u4f1a\u9020\u6210\u963b\u585e\uff0c\u5f53\u5f00\u542f\u4e86\u8fd9\u4e2a\u9009\u9879\u65f6\u4e5f\u4f1a\u4ea4\u7ed9\u5f02\u6b65\u7ebf\u7a0b\u6765\u64cd\u4f5c\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u963b\u585e\u4e3b\u7ebf\u7a0b\u4e86\u3002<\/p>\n
      \u591a\u7ebf\u7a0b<\/h3>\n
      redis\u5355\u7ebf\u7a0b+\u5f02\u6b65\u7ebf\u7a0b+\u5206\u7247\u5df2\u7ecf\u80fd\u6ee1\u8db3\u4e86\u7edd\u5927\u90e8\u5206\u5e94\u7528\uff0c\u7136\u540e\u6ca1\u6709\u6700\u597d\u53ea\u6709\u66f4\u597d\uff0credis\u57286.0\u8fd8\u662f\u63a8\u51fa\u4e86\u591a\u7ebf\u7a0b\u6a21\u5f0f\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u591a\u7ebf\u7a0b\u6a21\u5f0f\u662f\u5173\u95ed\u7684\u3002<\/p>\n
      \n# io-threads 4 # work\u7ebf\u7a0b\u6570\n# io-threads-do-reads no # \u662f\u5426\u5f00\u542f<\/pre>\n
      \u591a\u7ebf\u7a0b\u7684\u4f5c\u7528\u70b9\uff1f<\/h4>\n
      \u901a\u8fc7\u4e0a\u6587\u6211\u4eec\u77e5\u9053\u5f53\u6211\u4eec\u4ece\u4e00\u4e2asocket\u4e2d\u8bfb\u53d6\u6570\u636e\u7684\u65f6\u5019\uff0c\u9700\u8981\u4ece\u5185\u6838copy\u5230\u7528\u6237\u7a7a\u95f4\uff0c\u5f53\u6211\u4eec\u5f80socket\u4e2d\u5199\u6570\u636e\u7684\u65f6\u5019\uff0c\u9700\u8981\u4ece\u7528\u6237\u7a7a\u95f4copy\u5230\u5185\u6838\u3002redis\u672c\u8eab\u7684\u8ba1\u7b97\u8fd8\u662f\u5f88\u5feb\u7684\uff0c\u6162\u7684\u5730\u65b9\u90a3\u4e48\u4e3b\u8981\u5c31\u662fsocket IO\u76f8\u5173\u64cd\u4f5c\u4e86\u3002\u5f53\u6211\u4eec\u7684qps\u975e\u5e38\u5927\u7684\u65f6\u5019\uff0c\u5355\u7ebf\u7a0b\u7684redis\u65e0\u6cd5\u53d1\u6325\u591a\u6838cpu\u7684\u597d\u5904\uff0c\u90a3\u4e48\u901a\u8fc7\u5f00\u542f\u591a\u4e2a\u7ebf\u7a0b\u5229\u7528\u591a\u6838cpu\u6765\u5206\u62c5IO\u64cd\u4f5c\u662f\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002<\/p>\n
      \n
      So for instance if you have a four cores boxes, try to use 2 or 3 I\/O threads, if you have a 8 cores, try to use 6 threads.<\/p>\n<\/blockquote>\n
      \u5f00\u542f\u7684\u8bdd\uff0c\u5b98\u65b9\u5efa\u8bae\u5bf9\u4e8e\u4e00\u4e2a4\u6838\u7684\u673a\u5668\u6765\u8bf4\uff0c\u5f002-3\u4e2aIO\u7ebf\u7a0b\uff0c\u5982\u679c\u67098\u6838\uff0c\u90a3\u4e48\u5f006\u4e2aIO\u7ebf\u7a0b\u5373\u53ef\u3002<\/p>\n
      \u591a\u7ebf\u7a0b\u7684\u539f\u7406<\/h4>\n
      \u9700\u8981\u6ce8\u610f\u7684\u662fredis\u7684\u591a\u7ebf\u7a0b\u4ec5\u4ec5\u53ea\u662f\u5904\u7406socket IO\u8bfb\u5199\u662f\u591a\u4e2a\u7ebf\u7a0b\uff0c\u771f\u6b63\u53bb\u8fd0\u884c\u6307\u4ee4\u8fd8\u662f\u4e00\u4e2a\u7ebf\u7a0b\u53bb\u6267\u884c\u7684\u3002<\/p>\n
        \n
      1. redis server\u901a\u8fc7EventLoop\u6765\u76d1\u542c\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\uff0c\u5f53\u4e00\u4e2a\u8bf7\u6c42\u5230\u6765\u65f6\uff0c\u4e3b\u7ebf\u7a0b\u5e76\u4e0d\u4f1a\u7acb\u9a6c\u89e3\u6790\u6267\u884c\uff0c\u800c\u662f\u628a\u5b83\u653e\u5230\u5168\u5c40\u8bfb\u961f\u5217clients_pending_read\u4e2d\uff0c\u5e76\u7ed9\u6bcf\u4e2aclient\u6253\u4e0aCLIENT_PENDING_READ\u6807\u8bc6\u3002<\/li>\n
      2. \u7136\u540e\u4e3b\u7ebf\u7a0b\u901a\u8fc7RR\uff08Round-robin\uff09\u7b56\u7565\u628a\u6240\u6709\u4efb\u52a1\u5206\u914d\u7ed9I\/O\u7ebf\u7a0b\u548c\u4e3b\u7ebf\u7a0b\u81ea\u5df1\u3002<\/li>\n
      3. \u6bcf\u4e2a\u7ebf\u7a0b\uff08\u5305\u62ec\u4e3b\u7ebf\u7a0b\u548c\u5b50\u7ebf\u7a0b\uff09\u6839\u636e\u5206\u914d\u5230\u7684\u4efb\u52a1\uff0c\u901a\u8fc7client\u7684CLIENT_PENDING_READ\u6807\u8bc6\u53ea\u505a\u8bf7\u6c42\u53c2\u6570\u7684\u8bfb\u53d6\u548c\u89e3\u6790\uff08\u8fd9\u91cc\u5e76\u4e0d\u6267\u884c\u547d\u4ee4\uff09\u3002<\/li>\n
      4. \u4e3b\u7ebf\u7a0b\u4f1a\u5fd9\u8f6e\u8be2\u7b49\u5f85\u6240\u6709\u7684IO\u7ebf\u7a0b\u6267\u884c\u5b8c\uff0c\u6bcf\u4e2aIO\u7ebf\u7a0b\u90fd\u4f1a\u7ef4\u62a4\u4e00\u4e2a\u672c\u5730\u7684\u961f\u5217io_threads_list\u548c\u672c\u5730\u7684\u539f\u5b50\u8ba1\u6570\u5668io_threads_pending\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u7684\u4efb\u52a1\u662f\u9694\u79bb\u7684\uff0c\u4e0d\u4f1a\u91cd\u53e0\uff0c\u5f53IO\u7ebf\u7a0b\u5b8c\u6210\u4efb\u52a1\u4e4b\u540e\uff0cio_threads_pending[index] = 0\uff0c\u5f53\u6240\u6709\u7684io_threads_pending\u90fd\u662f0\u7684\u65f6\u5019\uff0c\u5c31\u662f\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u4e4b\u65f6\u3002<\/li>\n
      5. \u5f53\u6240\u6709read\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\uff0c\u4e3b\u7ebf\u7a0b\u901a\u8fc7\u904d\u5386clients_pending_read\u961f\u5217\uff0c\u6765\u6267\u884c\u771f\u6b63\u7684exec\u52a8\u4f5c\u3002<\/li>\n
      6. \u5728\u5b8c\u6210\u547d\u4ee4\u7684\u8bfb\u53d6\u3001\u89e3\u6790\u3001\u6267\u884c\u4e4b\u540e\uff0c\u5c31\u8981\u628a\u7ed3\u679c\u54cd\u5e94\u7ed9\u5ba2\u6237\u7aef\u4e86\u3002\u4e3b\u7ebf\u7a0b\u4f1a\u628a\u9700\u8981\u54cd\u5e94\u7684client\u52a0\u5165\u5230\u5168\u5c40\u7684clients_pending_write\u961f\u5217\u4e2d\u3002<\/li>\n
      7. \u4e3b\u7ebf\u7a0b\u904d\u5386clients_pending_write\u961f\u5217\uff0c\u518d\u901a\u8fc7RR\uff08Round-robin\uff09\u7b56\u7565\u628a\u6240\u6709\u4efb\u52a1\u5206\u7ed9I\/O\u7ebf\u7a0b\u548c\u4e3b\u7ebf\u7a0b\uff0c\u8ba9\u5b83\u4eec\u5c06\u6570\u636e\u56de\u5199\u7ed9\u5ba2\u6237\u7aef\u3002<\/li>\n<\/ol>\n
        \u591a\u7ebf\u7a0b\u6a21\u5f0f\u4e0b\uff0c\u6bcf\u4e2aIO\u7ebf\u7a0b\u8d1f\u8d23\u5904\u7406\u81ea\u5df1\u7684\u961f\u5217\uff0c\u4e0d\u4f1a\u4e92\u76f8\u5e72\u6270\uff0cIO\u7ebf\u7a0b\u8981\u4e48\u540c\u65f6\u5728\u8bfb\uff0c\u8981\u4e48\u540c\u65f6\u5728\u5199\uff0c\u4e0d\u4f1a\u540c\u65f6\u8bfb\u6216\u5199\u3002\u4e3b\u7ebf\u7a0b\u4e5f\u53ea\u4f1a\u5728\u6240\u6709\u7684\u5b50\u7ebf\u7a0b\u7684\u4efb\u52a1\u5904\u7406\u5b8c\u6bd5\u4e4b\u540e\uff0c\u624d\u4f1a\u5c1d\u8bd5\u518d\u6b21\u5206\u914d\u4efb\u52a1\u3002\u540c\u65f6\u6700\u7ec8\u7684\u547d\u4ee4\u6267\u884c\u8fd8\u662f\u7531\u4e3b\u7ebf\u7a0b\u81ea\u5df1\u6765\u5b8c\u6210\uff0c\u6574\u4e2a\u8fc7\u7a0b\u4e0d\u6d89\u53ca\u5230\u9501\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        Redis\u7f13\u5b58IO\u6a21\u578b\u7684\u6f14\u8fdb\u6559\u7a0b...<\/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-201288","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201288","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=201288"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201288\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201288"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201288"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}