{"id":201654,"date":"2025-05-10T10:18:34","date_gmt":"2025-05-10T02:18:34","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201654\/"},"modified":"2025-05-10T10:18:34","modified_gmt":"2025-05-10T02:18:34","slug":"redis%e7%9a%84io%e5%a4%9a%e8%b7%af%e5%a4%8d%e7%94%a8%e4%bb%a5%e5%8f%8aselect%ef%bc%8cepoll%e7%9a%84%e6%bc%94%e8%bf%9b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201654\/","title":{"rendered":"Redis\u7684IO\u591a\u8def\u590d\u7528\u4ee5\u53caSelect\uff0cEpoll\u7684\u6f14\u8fdb"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>Redis\u7684IO\u591a\u8def\u590d\u7528\u4ee5\u53caSelect\uff0cEpoll\u7684\u6f14\u8fdb<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662fgolang\u5b66\u4e60\u7f51\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7<span style=\"color: #FF6600;font-family:\">\u300aRedis\u7684IO\u591a\u8def\u590d\u7528\u4ee5\u53caSelect\uff0cEpoll\u7684\u6f14\u8fdb\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<span style=\"color: #FF6600;font-family:\">Redis\u3001IO\u3001Epoll<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n<p>\u4ec0\u4e48\u662f\u963b\u585e\uff0c\u975e\u963b\u585e\uff0c\u5f02\u6b65\u540c\u6b65\uff0cselect\uff0cpoll\uff0cepoll\uff1f\u4eca\u5929\u6211\u4eec\u7528\u4e00\u904d\u6587\u7ae0\u89e3\u5f00\u8fd9\u591a\u5e74\u7684\u8ff7\u60d1\u3002<\/p>\n<p>\u9996\u5148\u6211\u4eec\u60f3\u8981\u901a\u8fc7\u7f51\u7edc\u63a5\u6536\u6d88\u606f\uff0c\u662f\u8fd9\u6837\u7684\u4e00\u4e2a\u6b65\u9aa4\u3002<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830263ff56de04a27.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u7528\u6237\u7a7a\u95f4\u5411\u5185\u6838\u7a7a\u95f4\u8bf7\u6c42\u7f51\u7edc\u6570\u636e<\/li>\n<li>\u5185\u6838\u7a7a\u95f4\u628a\u7f51\u5361\u6570\u636e\u8bfb\u53d6\u5230\u5185\u6838\u7f13\u51b2\u533a<\/li>\n<li>\u5c06\u5185\u6838\u7f13\u51b2\u533a\u7684\u6570\u636e\u590d\u5236\u5230\u7528\u6237\u7f13\u51b2\u533a<\/li>\n<\/ol>\n<p>\u6839\u636e\u6211\u4eec\u8bf7\u6c42\u6570\u636e\u7684\u60c5\u51b5\u4e0d\u540c\uff0c\u4ee5\u53ca\u5185\u6838\u7f13\u51b2\u533a\u5230\u7528\u6237\u7f13\u51b2\u533a\u7684\u4e0d\u540c\uff0c\u5206\u4e3a\u4e86\u963b\u585e\uff0c\u975e\u963b\u585e\uff0c\u5f02\u6b65\u540c\u6b65\u7684\u533a\u522b\u3002<\/p>\n<p>\u5728\u300aUNIX\u7f51\u7edc\u7f16\u7a0b\u300b\u4e00\u4e66\u4e2d\uff0c\u603b\u7ed3\u5f52\u7eb3\u4e865\u79cdI0\u6a21\u578b:<\/p>\n<ul>\n<li>\u963b\u585e I0 ( Blocking I0)<\/li>\n<li>\u975e\u963b\u585e I0 (Nonblocking &nbsp;I0)<\/li>\n<li>I0\u591a\u8def\u590d\u7528(I0 Multiplexing)<\/li>\n<li>\u4fe1\u53f7\u9a71\u52a8I0 (Signal Driven &nbsp;I0 )<\/li>\n<li>\u5f02\u6b65I0 (Asynchronous &nbsp;I0)<\/li>\n<\/ul>\n<h4>\u963b\u585eIO<\/h4>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830263ff56de539aa.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u7528\u6237\u5e94\u7528\u8bf7\u6c42\u5185\u6838\u662f\u5426\u6709\u65b0\u7684\u7f51\u7edc\u6570\u636e<\/li>\n<li>\u5982\u679c\u6ca1\u6709\u6570\u636e\uff0c\u5c31\u963b\u585e\u76f4\u5230\u6709\u6570\u636e\u5230\u6765<\/li>\n<li>\u7b49\u5f85\u5185\u6838\u5c06\u6570\u636e\u62f7\u8d1d\u5230\u7528\u6237\u7a7a\u95f4<\/li>\n<li>\u7528\u6237\u5e94\u7528\u5904\u7406\u6570\u636e<\/li>\n<\/ol>\n<p>\u4ee5\u4e0a\u53ef\u4ee5\u770b\u51fa\u6765\uff0c\u6839\u636e\u7b49\u5f85\u6570\u636e\u7684\u65b9\u5f0f\u4e0d\u540c\uff0c\u5206\u4e3a\u963b\u585e\u548c\u975e\u963b\u585e\u3002<\/p>\n<p>\u963b\u585eIO\u5728\u8bf7\u6c42\u5185\u6838\u6570\u636e\u7684\u65f6\u5019\uff0c\u6ca1\u6709\u6570\u636e\u5c31\u4f1a\u4e00\u76f4\u963b\u585e\u76f4\u5230\u83b7\u53d6\u6570\u636e\u3002<\/p>\n<h4>\u975e\u963b\u585eIO<\/h4>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830263ff56dea2444.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u7528\u6237\u5e94\u7528\u8bf7\u6c42\u5185\u6838\u662f\u5426\u6709\u65b0\u7684\u7f51\u7edc\u6570\u636e<\/li>\n<li>\u5982\u679c\u6ca1\u6709\u6570\u636e\uff0c\u5185\u6838\u76f4\u63a5\u8fd4\u56de\u6ca1\u6570\u636e\uff0c\u7528\u6237\u5e94\u7528\u53ef\u4ee5\u9694\u4e00\u6bb5\u65f6\u95f4\u518d\u6765\u8bf7\u6c42\u3002<\/li>\n<li>\u7b49\u5f85\u5185\u6838\u5c06\u6570\u636e\u62f7\u8d1d\u5230\u7528\u6237\u7a7a\u95f4<\/li>\n<li>\u7528\u6237\u5e94\u7528\u5904\u7406\u6570\u636e<\/li>\n<\/ol>\n<p>\u975e\u963b\u585eIO\u5728\u7b49\u5f85\u5185\u6838\u6570\u636e\u7684\u65f6\u5019\uff0c\u6ca1\u6709\u6570\u636e\u5c31\u4f1a\u5f97\u5230\u6ca1\u6570\u636e\u7684\u7ed3\u679c\uff0c\u5e94\u7528\u53ef\u4ee5\u8fdb\u884c\u5176\u4ed6\u52a8\u4f5c\u3002<\/p>\n<h4>\u540c\u6b65IO<\/h4>\n<p>\u540c\u6b65IO\u7684\u4e3b\u8981\u770b\u5185\u6838\u6570\u636e\u5230\u7528\u6237\u7a7a\u95f4\u7684\u8fc7\u7a0b\u662f\u540c\u6b65\u8fdb\u884c\u7684\u5c31\u662f\u540c\u6b65IO<\/p>\n<h4>\u5f02\u6b65IO<\/h4>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830363ff56df065b2.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<p>\u5f02\u6b65IO\u9996\u5148\u662f\u975e\u963b\u585eIO\uff0c\u533a\u522b\u5728\u4e8e\u6210\u529f\u6807\u5fd7\u7684\u65f6\u673a\u3002\u5f02\u6b65IO\u8fde\u5185\u6838\u5230\u7528\u6237\u6001\u7684\u6570\u636e\u62f7\u8d1d\u90fd\u662f\u5f02\u6b65\u7684\uff0c\u76f4\u5230\u6570\u636e\u62f7\u8d1d\u5b8c\u6210\uff0c\u624d\u4f1a\u56de\u8c03\u4e00\u4e2a\u4fe1\u53f7\uff0c\u901a\u77e5\u4e00\u5207\u5df2\u7ecf\u51c6\u5907\u5b8c\u6210\u3002\u7528\u6237\u5e94\u7528\u6b64\u65f6\u5c31\u53ef\u4ee5\u76f4\u63a5\u5904\u7406\u7ed3\u679c\u4e86\u3002<\/p>\n<h4>\u603b\u7ed3<\/h4>\n<p>\u963b\u585e\u975e\u963b\u585e\u6307\u7684\u662f\u5728\u83b7\u53d6\u7ed3\u679c\u4e0a\u662f\u5426\u4f1a\u963b\u585e\u7b49\u5f85\u7ed3\u679c\u5b8c\u6210<\/p>\n<p>\u540c\u6b65\u5f02\u6b65\u6307\u7684\u662f\u662f\u5426\u4f1a\u53c2\u4e0eIO\u8bfb\u5199\uff0c\u6216\u8005\u662f\u7b49\u5f85\u8bfb\u5199\u6210\u529f\u7684\u56de\u8c03<\/p>\n<h3>redis\u7684IO\u591a\u8def\u590d\u7528<\/h3>\n<p>\u5982\u679c\u662f\u963b\u585eIO\u4e5f\u5c31\u662fBIO\uff0c\u90a3\u4e48\u5728\u4e00\u4e2afd\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\u6ca1\u6709\u6570\u636e\u7684\u65f6\u5019\uff0c\u5c31\u662f\u963b\u585e\u4e00\u76f4\u7b49\u5f85\uff0c\u5982\u679c\u540c\u65f6\u6709\u591a\u4e2afd\uff0c\u5bf9\u4e8e\u5355\u7ebf\u7a0b\u6765\u8bf4\uff0c\u53ea\u80fd\u4e00\u76f4\u7b49\u7b2c\u4e00\u4e2a\u6709\u6570\u636e\uff0c\u7136\u540e\u518d\u63a5\u7740\u5904\u7406\u7b2c\u4e8c\u4e2a\uff0c\u6548\u7387\u5f88\u6162\u3002<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830363ff56df4914e.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<p>\u5c31\u50cf\u987e\u5ba2\u70b9\u9910\uff0c\u8981\u4e00\u76f4\u7b49\u5230\u7b2c\u4e00\u4e2a\u4eba\u70b9\u5b8c\u9910\uff0c\u540e\u9762\u7684\u4eba\u624d\u6709\u673a\u4f1a\u3002BIO\u4e5f\u6709\u4e2a\u89e3\u51b3\u529e\u6cd5\uff0c\u4e00\u822c\u662f\u589e\u52a0\u591a\u7ebf\u7a0b\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u7ef4\u62a4\u4e00\u4e2afd\uff0c\u5c31\u76f8\u5f53\u4e8e\u4e3a\u6bcf\u4e2a\u987e\u5ba2\u90fd\u6dfb\u52a0\u4e00\u4e2a\u70b9\u9910\u53f0\u3002\u5728fd\u8db3\u591f\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u4f1a\u6709\u5927\u91cf\u7684\u7ebf\u7a0b\u88ab\u521b\u5efa\uff0c\u7ebf\u7a0b\u53ef\u662f\u6709\u4e0a\u9650\u7684\uff0c\u5f00\u9500\u4e5f\u5927\uff08\u66f4\u591a\u7ebf\u7a0b\u9700\u8981\u66f4\u591a\u7684\u5185\u5b58\u7a7a\u95f4\uff09\u3002<\/p>\n<p>\u5982\u679c\u662f\u975e\u963b\u585eIO\u4e5f\u5c31\u662fNIO\uff0c\u4f1a\u6709\u987e\u5ba2\u6ca1\u70b9\u5b8c\u9910\uff0c\u7136\u540e\u9020\u6210CPU\u4e00\u76f4\u5728\u8be2\u95ee\u4e00\u76f4\u7a7a\u8f6c\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u56e0\u6b64\u5f15\u5165\u4e86IO\u591a\u8def\u590d\u7528\u6a21\u578b:\u5229\u7528\u5355\u4e2a\u7ebf\u7a0b\u6765\u540c\u65f6\u76d1\u542c\u591a\u4e2aFD,\u5e76\u5728\u67d0\u4e2aFD\u53ef\u8bfb\u3001\u53ef\u5199\u65f6\u5f97\u5230\u901a\u77e5,\u4ece\u800c\u907f\u514d\u65e0\u6548\u7684\u7b49\u5f85\uff0c\u5145\u5206\u5229\u7528CPU\u8d44\u6e90<\/p>\n<p>\u6587\u4ef6\u63cf\u8ff0\u7b26( File Descriptor) :\u7b80\u79f0FD,\u662f\u4e00\u4e2a\u4ece0\u5f00\u59cb\u9012\u589e\u7684\u65e0\u7b26\u53f7\u6574\u6570\uff0c\u7528\u6765\u5173\u8054Linux\u4e2d\u7684\u4e00\u4e00\u4e2a\u6587\u4ef6\u3002\u5728Linux<\/p>\n<p>\u4e2d\uff0c\u4e00\u5207\u7686\u6587\u4ef6,\u4f8b\u5982\u5e38\u89c4\u6587\u4ef6\u3001\u89c6\u9891\u3001\u786c\u4ef6\u8bbe\u5907\u7b49\uff0c\u5f53\u7136\u4e5f\u5305\u62ec\u7f51\u7edc\u5957\u63a5\u5b57(Socket),<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830363ff56df84f1e.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<p>\u8fd9\u65f6\u5019\u6bcf\u6765\u4e00\u4e2a\u987e\u5ba2\uff08FD\u200b\uff09\uff0c\u6211\u4eec\u5c31\u4f1a\u7ed9\u4ed6\u4e00\u4e2a\u5f00\u5173\uff08\u6ce8\u518c\u8fdb\u76d1\u542c\u4e8b\u4ef6\u200b\uff09\uff0c\u4e00\u4e2a\u670d\u52a1\u5458\uff08\u4e00\u4e2a\u7ebf\u7a0b\u200b\uff09\u7b49\u5f85\u5f00\u5173\u4eae\u8d77\uff08\u963b\u585e\u7b49\u5f85\u4e8b\u4ef6\u200b\uff09\u3002\u6709\u987e\u5ba2\u5b8c\u6210\uff0c\u5c31\u4f1a\u6309\u4e0b\u5f00\u5173\uff0c\u4e00\u5b9a\u7684\u9891\u7387\u4e0b\u5f00\u5173\u4f1a\u4eae\u8d77\uff08\u4e8b\u4ef6\u901a\u77e5\u200b\uff09\uff0c\u670d\u52a1\u5458\u4f1a\u9009\u53d6\u6309\u4e0b\u5f00\u5173\u7684\u4e00\u6279\u4eba\uff0c\u7ed9\u4ed6\u4eec\u70b9\u9910\uff08\u6279\u91cf\u5904\u7406\u4e8b\u4ef6\uff09\u3002<\/p>\n<p>IO\u591a\u8def\u590d\u7528\u7684\u5b9e\u73b0\u6709select,poll,epoll\uff0c\u6211\u4eec\u6765\u770b\u770b\u4ed6\u4eec\u7684\u4f18\u7f3a\u70b9\u3002<\/p>\n<h4>select<\/h4>\n<p>select\u662fLinux\u4e2d\u6700\u65e9\u7684I\/O\u591a\u8def\u590d\u7528\u5b9e\u73b0\u65b9\u6848\uff0c\u5e76\u4e14windows\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u53ea\u652f\u6301select\u3002\u8fd9\u5c31\u662f\u4e3a\u5565window\u53d1\u6325\u4e0d\u51faredis\u7684\u6700\u5927\u6027\u80fd\u7684\u4e00\u4e2a\u539f\u56e0\u3002<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830363ff56dfce869.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830463ff56e076db2.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<p>select\u51fd\u6570\u6267\u884c\u6d41\u7a0b<\/p>\n<ol>\n<li>\u7528\u6237\u7a7a\u95f4\u521b\u5efafd_set\uff0c\u628a\u9700\u8981\u76d1\u542c\u7684\u4f4d\u7f6e\u7f6e1\uff0c\u6bd4\u5982 1\uff0c2\uff0c5<\/li>\n<li>\u7528\u6237\u7a7a\u95f4\u62f7\u8d1dfd_set\uff08\u6ce8\u518c\u7684\u4e8b\u4ef6\u96c6\u5408\uff09\u5230\u5185\u6838\u7a7a\u95f4<\/li>\n<li>\u5185\u6838\u904d\u5386\u6240\u6709fd\u6587\u4ef6\uff0c\u5e76\u5c06\u5f53\u524d\u8fdb\u7a0b\u6302\u5230\u6bcf\u4e2afd\u7684\u7b49\u5f85\u961f\u5217\u4e2d\uff0c\u5f53\u67d0\u4e2afd\u6587\u4ef6\u8bbe\u5907\u6536\u5230\u6d88\u606f\u540e\uff0c\u4f1a\u5524\u9192\u8bbe\u5907\u7b49\u5f85\u961f\u5217\u4e0a\u7761\u7720\u7684\u8fdb\u7a0b\uff0c\u90a3\u4e48\u5f53\u524d\u8fdb\u7a0b\u5c31\u4f1a\u88ab\u5524\u9192<\/li>\n<li>\u5185\u6838\u5982\u679c\u904d\u5386\u5b8c\u6240\u6709\u7684fd\u6ca1\u6709I\/O\u4e8b\u4ef6\uff0c\u5219\u5f53\u524d\u8fdb\u7a0b\u8fdb\u5165\u7761\u7720\uff0c\u5f53\u6709\u67d0\u4e2afd\u6587\u4ef6\u6709I\/O\u4e8b\u4ef6\u6216\u5f53\u524d\u8fdb\u7a0b\u7761\u7720\u8d85\u65f6\u540e\uff0c\u5f53\u524d\u8fdb\u7a0b\u91cd\u65b0\u5524\u9192\u518d\u6b21\u904d\u5386\u6240\u6709fd\u6587\u4ef6<\/li>\n<li>\u5185\u6838\u6709\u4e8b\u4ef6\u4ea7\u751f\uff0c\u4f1a\u628afd_set\u4e2d\u6709\u4e8b\u4ef6\u7684\u4f4d\u7f6e\u4fdd\u7559\u4e3a1\uff0c\u6ca1\u6709\u4e8b\u4ef6\u7684\u4f4d\u7f6e\u64e6\u9664\u4e3a0.<\/li>\n<li>\u5185\u6838\u62f7\u8d1dfd_set\u7ed9\u7528\u6237\u7a7a\u95f4<\/li>\n<li>\u7528\u6237\u7a7a\u95f4\u7ebf\u7a0b\u88ab\u5524\u9192\uff0c\u904d\u5386fd_set\u4e3a1\u7684\u4f4d\u7f6e\uff0c\u786e\u8ba4\u662f\u54ea\u4e9bfd\u6709\u5c31\u7eea\u4e8b\u4ef6\uff0c\u7136\u540e\u5f00\u59cb\u5904\u7406<\/li>\n<li>\u7528\u6237\u7a7a\u95f4\u5904\u7406\u5b8c\u4e8b\u4ef6\uff0c\u518d\u4e00\u6b21\u5c06\u8981\u76d1\u542c\u7684fd_set\u8bbe\u7f6e\u4e3a1\uff0c\u91cd\u590d\u4e4b\u524d\u7684\u76d1\u542c\u52a8\u4f5c<\/li>\n<\/ol>\n<p>\u6839\u636e\u4e0a\u9762\u53ef\u4ee5\u5f88\u6e05\u695a\u7684\u770b\u51fa\u6574\u4e2a\u6267\u884c\u6d41\u7a0b\u5728\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u7684\u5207\u6362\u3002<\/p>\n<p>select\u51fd\u6570\u7684\u7f3a\u70b9<\/p>\n<ul>\n<li>\u5355\u4e2a\u8fdb\u7a0b\u6240\u6253\u5f00\u7684FD\u662f\u6709\u9650\u5236\u7684\uff0c\u901a\u8fc7 FD_SETSIZE \u8bbe\u7f6e\uff0c\u9ed8\u8ba41024<\/li>\n<li>\u6bcf\u6b21\u8c03\u7528 select\uff0c\u90fd\u9700\u8981\u628a fd \u96c6\u5408\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u5230\u5185\u6838\u6001\uff0c\u8fd9\u4e2a\u5f00\u9500\u5728 fd \u5f88\u591a\u65f6\u4f1a\u5f88\u5927<\/li>\n<li>\u6bcf\u6b21\u8c03\u7528select\u90fd\u9700\u8981\u5c06\u8fdb\u7a0b\u52a0\u5165\u5230\u6240\u6709\u76d1\u89c6socket\u7684\u7b49\u5f85\u961f\u5217\uff0c\u6bcf\u6b21\u5524\u9192\u90fd\u9700\u8981\u4ece\u6bcf\u4e2a\u961f\u5217\u4e2d\u79fb\u9664<\/li>\n<li>select\u51fd\u6570\u5728\u6bcf\u6b21\u8c03\u7528\u4e4b\u524d\u90fd\u8981\u5bf9\u53c2\u6570\u8fdb\u884c\u91cd\u65b0\u8bbe\u5b9a\uff0c\u8fd9\u6837\u505a\u6bd4\u8f83\u9ebb\u70e6\uff0c\u800c\u4e14\u4f1a\u964d\u4f4e\u6027\u80fd<\/li>\n<li>\u8fdb\u7a0b\u88ab\u5524\u9192\u540e\uff0c\u7a0b\u5e8f\u5e76\u4e0d\u77e5\u9053\u54ea\u4e9bsocket\u6536\u5230\u6570\u636e\uff0c\u8fd8\u9700\u8981\u904d\u5386\u4e00\u6b21<\/li>\n<\/ul>\n<h4>poll<\/h4>\n<p>poll\u672c\u8d28\u4e0a\u548cselect\u6ca1\u6709\u533a\u522b\uff0c\u5b83\u5c06\u7528\u6237\u4f20\u5165\u7684\u6570\u7ec4\u62f7\u8d1d\u5230\u5185\u6838\u7a7a\u95f4\uff0c\u7136\u540e\u67e5\u8be2\u6bcf\u4e2afd\u5bf9\u5e94\u7684\u8bbe\u5907\u72b6\u6001\uff0c&nbsp;\u4f46\u662f\u5b83\u6ca1\u6709\u6700\u5927\u8fde\u63a5\u6570\u7684\u9650\u5236\uff0c\u539f\u56e0\u662f\u5b83\u662f\u57fa\u4e8e\u94fe\u8868\u6765\u5b58\u50a8\u7684<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830463ff56e0c56c6.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<p>poll\u8fd0\u884c\u6d41\u7a0b<\/p>\n<p>\u2460\u521b\u5efapollfd\u6570\u7ec4\uff0c \u5411\u5176\u4e2d\u6dfb\u52a0\u5173\u6ce8\u7684fd\u4fe1\u606f\uff0c\u6570\u7ec4\u5927\u5c0f\u81ea\u5b9a\u4e49<\/p>\n<p>\u2461\u8c03\u7528poll\u51fd\u6570\uff0c\u5c06pollfd\u6570\u7ec4\u62f7\u8d1d\u5230\u5185\u6838\u7a7a\u95f4\uff0c\u8f6c\u94fe\u8868\u5b58\u50a8\uff0c\u65e0\u4e0a\u9650<\/p>\n<p>\u2462\u5185\u6838\u904d\u5386fd,\u5224\u65ad\u662f\u5426\u5c31\u7eea<\/p>\n<p>\u2463\u6570\u636e\u5c31\u7eea\u6216\u8d85\u65f6\u540e\uff0c\u62f7\u8d1dpollfd\u6570\u7ec4\u5230\u7528\u6237\u7a7a\u95f4\uff0c\u8fd4\u56de\u5c31\u7eeafd\u6570\u91cfn<\/p>\n<p>\u2464\u7528\u6237\u8fdb\u7a0b\u5224\u65adn\u662f\u5426\u5927\u4e8e0<\/p>\n<p>\u2465\u5927\u4e8e0\u5219\u904d\u5386pollfd\u6570\u7ec4,\u627e\u5230\u5c31\u7eea\u7684fd<\/p>\n<p>\u4e0eselect\u5bf9\u6bd4<\/p>\n<ul>\n<li>select\u6a21\u5f0f\u4e2d\u7684fd_ set\u5927\u5c0f\u56fa\u5b9a\u4e3a1024,\u800cpollfd\u5728\u5185\u6838\u4e2d\u91c7\u7528\u94fe\u8868\uff0c\u7406\u8bba\u4e0a\u65e0\u4e0a\u9650.<\/li>\n<li>\u76d1\u542cFD\u8d8a\u591a\uff0c\u6bcf\u6b21\u904d\u5386\u6d88\u8017\u65f6\u95f4\u4e5f\u8d8a\u4e45\uff0c\u6027\u80fd\u53cd\u800c\u4f1a\u4e0b\u964d<\/li>\n<\/ul>\n<p>poll\u8fd8\u662f\u6ca1\u6709\u89e3\u51b3\u9700\u8981\u904d\u5386\u5224\u65adfd\u4e8b\u4ef6\u7684\u65b9\u5f0f\uff0c\u53ea\u662f\u589e\u52a0\u4e86\u76d1\u542c\u6570\u91cf\uff0c\u5728fd\u5f88\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u6027\u80fd\u4e0b\u964d\u7684\u66f4\u52a0\u4e25\u91cd<\/p>\n<h4>epoll<\/h4>\n<p>epoll\u53ef\u4ee5\u7406\u89e3\u4e3aevent pool\uff0c\u4e0d\u540c\u4e0eselect\u3001poll\u7684\u8f6e\u8be2\u673a\u5236\uff0cepoll\u91c7\u7528\u7684\u662f\u4e8b\u4ef6\u9a71\u52a8\u673a\u5236\uff0c\u6bcf\u4e2afd\u4e0a\u6709\u6ce8\u518c\u6709\u56de\u8c03\u51fd\u6570\uff0c\u5f53\u7f51\u5361\u63a5\u6536\u5230\u6570\u636e\u65f6\u4f1a\u56de\u8c03\u8be5\u51fd\u6570\uff0c\u540c\u65f6\u5c06\u8be5fd\u7684\u5f15\u7528\u653e\u5165rdlist\u5c31\u7eea\u5217\u8868\u4e2d\u3002<\/p>\n<p>\u5f53\u8c03\u7528epoll_wait\u68c0\u67e5\u662f\u5426\u6709\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0c\u53ea\u9700\u8981\u68c0\u67e5eventpoll\u5bf9\u8c61\u4e2d\u7684rdlist\u53cc\u94fe\u8868\u4e2d\u662f\u5426\u6709epitem\u5143\u7d20\u5373\u53ef\u3002\u5982\u679crdlist\u4e0d\u4e3a\u7a7a\uff0c\u5219\u628a\u53d1\u751f\u7684\u4e8b\u4ef6\u590d\u5236\u5230\u7528\u6237\u6001\uff0c\u540c\u65f6\u5c06\u4e8b\u4ef6\u6570\u91cf\u8fd4\u56de\u7ed9\u7528\u6237\u3002<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830563ff56e12e33b.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<p>\u4ed6\u4e3b\u8981\u6709\u4e09\u4e2a\u51fd\u6570\uff0cepoll\u7684\u6267\u884c\u6d41\u7a0b<\/p>\n<ol>\n<li>\u8c03\u7528epoll_create\u521b\u5efa\u4e00\u4e2aeventpoll\u7ed3\u6784\u4f53\uff0c\u8fd9\u4e2a\u7ed3\u6784\u4f53\u6709\u4e00\u4e2a\u76d1\u542c\u4e8b\u4ef6\u7ea2\u9ed1\u8272\uff0c\u548c\u4e00\u4e2a\u5c31\u7eea\u94fe\u8868\uff08\u8fd9\u4e2a\u94fe\u8868\u53ea\u4f1a\u5b58\u653e\u5c31\u7eeafd\uff0c\u907f\u514d\u6211\u4eec\u65e0\u6548\u7684\u904d\u5386\u6240\u6709fd\uff09<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830563ff56e18bc5c.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u8c03\u7528epoll_ctl\u5411eventpoll\u4e2d\u6ce8\u518c\u4e00\u4e2a\u76d1\u542c\u7684fd\uff0c\u5e76\u4e14\u6ce8\u518c\u4e0afd\u5bf9\u5e94\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u3002<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830563ff56e1d0a3f.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u8c03\u7528epoll_wait\u5f00\u59cb\u963b\u585e\u7b49\u5f85\u4e8b\u4ef6\u5230\u6765<\/li>\n<li>\u5185\u6838\u5c06\u76d1\u542c\u5230\u7684\u4e8b\u4ef6\u6dfb\u52a0\u4e00\u4efd\u5230\u5c31\u7eea\u961f\u5217list_head<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830663ff56e229ae7.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u5185\u6838\u5524\u9192\u7528\u6237\u7ebf\u7a0b\uff0c\u5e76\u5c06\u5c31\u7eea\u94fe\u8868\u62f7\u8d1d\u5230\u7528\u6237\u7a7a\u95f4<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830663ff56e276156.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u7528\u6237\u5e94\u7528\u53ea\u9700\u8981\u5173\u5fc3\u8fd9\u4e9b\u5c31\u7eea\u7684fd\u4e8b\u4ef6\uff0c\u76f4\u63a5\u53d6\u51fa\u7ed3\u6784\u4f53\u91cc\u5173\u8054\u7684\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u56de\u8c03\u5373\u53ef\u5904\u7406\u4e8b\u4ef6\u3002<\/li>\n<\/ol>\n<p>\u5bf9\u5e94\u7684redis\u7684server\u6267\u884c\u6d41\u7a0b<\/p>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230301\/167767830663ff56e2c925f.png\" style=\"max-width:100%\" class=\"aligncenter\"> <\/p>\n<ol>\n<li>\u8c03\u7528epoll_create\u521b\u5efa\u4e00\u4e2aeventpoll\u7ed3\u6784\u4f53<\/li>\n<li>\u8c03\u7528epoll_ctl\u5411eventpoll\u4e2d\u6ce8\u518c\u4e00\u4e2a\u76d1\u542c\u8fde\u63a5\u7684serverSocket\uff0c\u5e76\u5173\u8054\u4e0a\u5904\u7406accept\u4e8b\u4ef6\u7684\u51fd\u6570<\/li>\n<li>\u8c03\u7528epoll_wait\u963b\u585e\u7b49\u5f85fd\u4e8b\u4ef6\uff08\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5\uff09<\/li>\n<li>\u7528\u6237\u7a0b\u5e8f\u88ab\u5524\u9192\uff0c\u4e8b\u4ef6\u5230\u6765\uff08\u73b0\u5728\u53ea\u6709\u8fde\u63a5\u4e8b\u4ef6\uff09\u3002\u6839\u636e\u751f\u6210\u7684\u5ba2\u6237\u7aef\u7684FD\uff0c\u8c03\u7528epoll_ctl\u6ce8\u518c\u4e00\u4e2a\u76d1\u542c\uff0c\u5e76\u4e14\u5173\u8054\u4e0a\u5904\u7406read\u4e8b\u4ef6\u7684\u51fd\u6570\u548c\u5904\u7406write\u4e8b\u4ef6\u7684\u51fd\u6570\u3002<\/li>\n<li>\u7ee7\u7eed\u8c03\u7528epoll_wait\u963b\u585e\u7b49\u5f85fd\u4e8b\u4ef6\uff08\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5\u6216\u5ba2\u6237\u7aef\u547d\u4ee4\u6267\u884c\u8bf7\u6c42\uff09<\/li>\n<li>\u7528\u6237\u7a0b\u5e8f\u88ab\u5524\u9192\uff0c\u4e8b\u4ef6\u5230\u6765\uff08\u8fde\u63a5\u4e8b\u4ef6\u6216\u8005\u547d\u4ee4\u6267\u884c\u8bf7\u6c42\uff09\uff0c\u5047\u8bbe\u662f\u5ba2\u6237\u7aef\u6267\u884c\u8bf7\u6c42\u4e8b\u4ef6\uff0c\u6839\u636e\u5ba2\u6237\u7aef\u7684fd\u5bf9\u5e94\u7684read\u4e8b\u4ef6\u76f4\u63a5\u8c03\u7528\u7ed1\u5b9a\u7684\u56de\u8c03\u51fd\u6570\u6765\u5904\u7406\uff0c\u5c06\u7ed3\u679c\u518d\u5199\u56de\u5230fd\u7f13\u5b58\u4e2d\u3002<\/li>\n<li>\u7ee7\u7eed\u8c03\u7528epoll_wait\u7b49\u5f85accept\uff0cread\uff0cwrite\u4e8b\u4ef6\u3002<\/li>\n<\/ol>\n<p>epoll\u4f18\u70b9<\/p>\n<ul>\n<li>EPOLL\u652f\u6301\u7684\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u9650\u662f\u6574\u4e2a\u7cfb\u7edf\u6700\u5927\u53ef\u6253\u5f00\u7684\u6587\u4ef6\u6570\u76ee, 1G\u5185\u5b58\u7406\u8bba\u4e0a\u6700\u5927\u521b\u5efa10\u4e07\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n<li>\u6bcf\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u90fd\u6709\u4e00\u4e2acallback\u51fd\u6570\uff0c\u5f53socket\u6709\u4e8b\u4ef6\u53d1\u751f\u65f6\u4f1a\u56de\u8c03\u8fd9\u4e2a\u51fd\u6570\u5c06\u8be5fd\u7684\u5f15\u7528\u6dfb\u52a0\u5230\u5c31\u7eea\u5217\u8868\u4e2d\uff0cselect\u548cpoll\u5e76\u4e0d\u4f1a\u660e\u786e\u6307\u51fa\u662f\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\uff0c\u800cepoll\u4f1a\u3002\u9020\u6210\u7684\u533a\u522b\u5c31\u662f\uff0c\u7cfb\u7edf\u8c03\u7528\u8fd4\u56de\u540e\uff0c\u8c03\u7528select\u548cpoll\u7684\u7a0b\u5e8f\u9700\u8981\u904d\u5386\u76d1\u542c\u7684\u6574\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u627e\u5230\u662f\u8c01\u5904\u4e8e\u5c31\u7eea\uff0c\u800cepoll\u5219\u76f4\u63a5\u5904\u7406\u5373\u53ef<\/li>\n<li>select\u3001poll\u91c7\u7528\u8f6e\u8be2\u7684\u65b9\u5f0f\u6765\u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u5904\u4e8e\u5c31\u7eea\u6001\uff0c\u800cepoll\u91c7\u7528\u56de\u8c03\u673a\u5236\u3002\u9020\u6210\u7684\u7ed3\u679c\u5c31\u662f\uff0c\u968f\u7740fd\u7684\u589e\u52a0\uff0cselect\u548cpoll\u7684\u6548\u7387\u4f1a\u7ebf\u6027\u964d\u4f4e\uff0c\u800cepoll\u4e0d\u4f1a\u53d7\u5230\u592a\u5927\u5f71\u54cd\uff0c\u9664\u975e\u6d3b\u8dc3\u7684socket\u5f88\u591a<\/li>\n<\/ul>\n<p>\u8bfb\u4e8b\u4ef6\u5f88\u597d\u7406\u89e3\uff0c\u6709\u4e00\u4e2a\u8bfb\u4e8b\u4ef6\u5c31\u7acb\u9a6c\u5904\u7406\u8bf7\u6c42\uff0c\u600e\u4e48\u7406\u89e3\u5199\u4e8b\u4ef6\uff1f<\/p>\n<p>\u5f53socket \u5199\u7f13\u51b2\u533a\u5df2\u6ee1\uff0c\u5047\u5982\u8bbe\u7f6e\u4e86\u975e\u963b\u585eI\/O,\u5e94\u7528\u7a0b\u5e8f\u8c03\u7528send\u4f1a\u8fd4\u56deEAGAIN,\u544a\u8bc9\u5e94\u7528\u7a0b\u5e8f\u5199\u7f13\u51b2\u533a\u5df2\u6ee1\uff0c\u4e0b\u6b21\u518d\u6765\u5c1d\u8bd5\u8c03\u7528\uff0c\u8fd9\u65f6\u5019\u5c31\u6709\u4e00\u4e2a\u5c1d\u8bd5\u7684\u65f6\u673a\u95ee\u9898\uff0c\u5e94\u7528\u7a0b\u5e8f\u600e\u4e48\u77e5\u9053socket \u7f13\u51b2\u533a\u53ef\u5199\u5462\uff1f\u5982\u679c\u9891\u7e41\u8c03\u7528send\uff0c\u4f1a\u6d6a\u8d39CPU\u3002\u8fd9\u65f6\u5019\uff0cepoll\u5c31\u6392\u4e0a\u7528\u573a\u4e86\uff0c\u5bf9socket \u8bbe\u7f6e\u5199\u4e8b\u4ef6\uff0c\u5e76\u6dfb\u52a0\u5230 epoll\u4e2d\uff0c\u5e94\u7528\u7a0b\u5e8f\u8c03\u7528epoll_wait\uff0c\u5f53\u8be5socket \u7684\u5199\u7f13\u51b2\u6709\u7a7a\u4f59\u65f6\uff0c\u5c31\u8fd4\u56de\u5bf9\u5e94\u7684\u5199\u4e8b\u4ef6\uff0c\u5e94\u7528\u7a0b\u5e8f\u8fd9\u65f6\u5019\u5c31\u53ef\u4ee5\u8c03\u7528send,\u53d1\u9001\u6570\u636e\u3002<\/p>\n<p>\u6240\u4ee5\u5199\u4e8b\u4ef6\u662f\u7528\u6765\u544a\u8bc9\u7a0b\u5e8f\uff0c\u5199\u7f13\u51b2\u662f\u7a7a\u4f59\u7684\u3002\u4e00\u822c\u60c5\u51b5\u4e0bfd\u90fd\u662f\u6709\u5199\u4e8b\u4ef6\u7684\u3002\u4f46\u662f\u5728\u5199\u7f13\u51b2\u533a\u6ee1\u4e86\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u9891\u7e41\u89e6\u53d1\u5199\u4e8b\u4ef6\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4e00\u5f00\u59cb\u4e0d\u76d1\u542c\u5199\u4e8b\u4ef6\uff0c\u76f4\u5230\u53d1\u73b0\u6570\u636e\u91cf\u53ef\u80fd\u5927\u4e8e\u7f13\u51b2\u533a\uff0c\u518d\u76d1\u542c\u5199\u4e8b\u4ef6<\/p>\n<p>\u53c2\u8003\uff1a\u9ad8\u6548\u5904\u7406\u5199\u4e8b\u4ef6<\/p>\n<h2>\u53c2\u8003<\/h2>\n<p>select poll epoll<\/p>\n<p>\u9ed1\u9a6c\u591a\u8def\u590d\u7528\u89c6\u9891<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Redis\u7684IO\u591a\u8def\u590d\u7528\u4ee5\u53caSe&#46;&#46;&#46;<\/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-201654","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201654","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=201654"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201654\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}