{"id":98538,"date":"2024-10-21T03:27:21","date_gmt":"2024-10-20T19:27:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/98538\/"},"modified":"2024-10-21T03:27:22","modified_gmt":"2024-10-20T19:27:22","slug":"redis-%e7%9a%84-io-%e5%a4%9a%e8%b7%af%e5%be%a9%e7%94%a8%e4%bb%a5%e5%8f%8a-select%ef%bc%8cepoll-%e7%9a%84%e6%bc%94%e9%80%b2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/98538\/","title":{"rendered":"Redis \u7684 IO \u591a\u8def\u5fa9\u7528\u4ee5\u53ca Select\uff0cEpoll \u7684\u6f14\u9032"},"content":{"rendered":"<h1 id=\"redis-%e7%9a%84-io-%e5%a4%9a%e8%b7%af%e5%be%a9%e7%94%a8%e4%bb%a5%e5%8f%8a-select%ef%bc%8cepoll-%e7%9a%84%e6%bc%94%e9%80%b2-GCpJzPbdxj\">Redis \u7684 IO \u591a\u8def\u5fa9\u7528\u4ee5\u53ca Select\uff0cEpoll \u7684\u6f14\u9032<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u9ad8\u6548\u80fd\u8a08\u7b97\u74b0\u5883\u4e2d\uff0cRedis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u5834\u666f\u4e2d\u3002\u5176\u6027\u80fd\u7684\u512a\u8d8a\u6027\u90e8\u5206\u4f86\u81ea\u65bc\u5176\u5c0d IO \u591a\u8def\u5fa9\u7528\u6280\u8853\u7684\u904b\u7528\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e Redis \u7684 IO \u591a\u8def\u5fa9\u7528\u6a5f\u5236\uff0c\u4ee5\u53ca Select \u548c Epoll \u7684\u6f14\u9032\u904e\u7a0b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-io-%e5%a4%9a%e8%b7%af%e5%be%a9%e7%94%a8%ef%bc%9f-GCpJzPbdxj\">\u4ec0\u9ebc\u662f IO \u591a\u8def\u5fa9\u7528\uff1f<\/h2>\n<p>IO \u591a\u8def\u5fa9\u7528\u662f\u4e00\u7a2e\u80fd\u5920\u540c\u6642\u76e3\u63a7\u591a\u500b IO \u6d41\u7684\u6280\u8853\uff0c\u9019\u4f7f\u5f97\u55ae\u500b\u9032\u7a0b\u80fd\u5920\u8655\u7406\u591a\u500b\u9023\u63a5\u3002\u9019\u5728\u9ad8\u4f75\u767c\u7684\u61c9\u7528\u4e2d\u5c24\u70ba\u91cd\u8981\uff0c\u56e0\u70ba\u5b83\u80fd\u5920\u6709\u6548\u5730\u5229\u7528\u7cfb\u7d71\u8cc7\u6e90\uff0c\u6e1b\u5c11\u4e0a\u4e0b\u6587\u5207\u63db\u7684\u958b\u92b7\u3002<\/p>\n<h2 id=\"redis-%e4%b8%ad%e7%9a%84-io-%e5%a4%9a%e8%b7%af%e5%be%a9%e7%94%a8-GCpJzPbdxj\">Redis \u4e2d\u7684 IO \u591a\u8def\u5fa9\u7528<\/h2>\n<p>Redis \u4f7f\u7528 IO \u591a\u8def\u5fa9\u7528\u4f86\u8655\u7406\u5ba2\u6236\u7aef\u7684\u8acb\u6c42\u3002\u7576\u4e00\u500b\u5ba2\u6236\u7aef\u9023\u63a5\u5230 Redis \u4f3a\u670d\u5668\u6642\uff0c\u4f3a\u670d\u5668\u4e0d\u6703\u70ba\u6bcf\u500b\u9023\u63a5\u5275\u5efa\u4e00\u500b\u65b0\u7684\u57f7\u884c\u7dd2\u6216\u9032\u7a0b\uff0c\u800c\u662f\u4f7f\u7528\u4e00\u500b\u55ae\u4e00\u7684\u4e8b\u4ef6\u5faa\u74b0\u4f86\u8655\u7406\u6240\u6709\u7684\u8acb\u6c42\u3002\u9019\u6a23\u7684\u8a2d\u8a08\u4f7f\u5f97 Redis \u80fd\u5920\u5728\u9ad8\u4f75\u767c\u7684\u60c5\u6cc1\u4e0b\u4ecd\u7136\u4fdd\u6301\u9ad8\u6548\u80fd\u3002<\/p>\n<h3 id=\"redis-%e7%9a%84%e4%ba%8b%e4%bb%b6%e5%be%aa%e7%92%b0-GCpJzPbdxj\">Redis \u7684\u4e8b\u4ef6\u5faa\u74b0<\/h3>\n<p>Redis \u7684\u4e8b\u4ef6\u5faa\u74b0\u662f\u5176\u6838\u5fc3\u7d44\u4ef6\u4e4b\u4e00\u3002\u5b83\u8ca0\u8cac\u76e3\u63a7\u6240\u6709\u7684\u5ba2\u6236\u7aef\u9023\u63a5\uff0c\u4e26\u5728\u6709\u4e8b\u4ef6\u767c\u751f\u6642\u9032\u884c\u8655\u7406\u3002\u9019\u500b\u5faa\u74b0\u4e3b\u8981\u4f9d\u8cf4\u65bc IO \u591a\u8def\u5fa9\u7528\u6280\u8853\u4f86\u5be6\u73fe\u3002Redis \u652f\u6301\u591a\u7a2e IO \u591a\u8def\u5fa9\u7528\u7684\u5be6\u73fe\uff0c\u5305\u62ec Select\u3001Epoll \u548c Kqueue\u3002<\/p>\n<h2 id=\"select-%e7%9a%84%e7%89%b9%e9%bb%9e-GCpJzPbdxj\">Select \u7684\u7279\u9ede<\/h2>\n<p>Select \u662f\u6700\u65e9\u7684 IO \u591a\u8def\u5fa9\u7528\u6280\u8853\u4e4b\u4e00\u3002\u5b83\u7684\u4e3b\u8981\u7279\u9ede\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7c21\u55ae\u6613\u7528\uff1aSelect \u7684 API \u7c21\u55ae\uff0c\u6613\u65bc\u7406\u89e3\u548c\u4f7f\u7528\u3002<\/li>\n<li>\u8de8\u5e73\u53f0\uff1aSelect \u5728\u591a\u500b\u64cd\u4f5c\u7cfb\u7d71\u4e0a\u90fd\u80fd\u904b\u884c\uff0c\u5305\u62ec UNIX \u548c Windows\u3002<\/li>\n<li>\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236\uff1aSelect \u7684\u4e00\u500b\u4e3b\u8981\u7f3a\u9ede\u662f\u5b83\u5c0d\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6578\u91cf\u6709\u9650\u5236\uff0c\u901a\u5e38\u70ba 1024\u3002<\/li>\n<\/ul>\n<h3 id=\"select-%e7%9a%84%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-GCpJzPbdxj\">Select \u7684\u4f7f\u7528\u7bc4\u4f8b<\/h3>\n<pre><code>\n#include &lt;sys\/select.h&gt;\n#include &lt;unistd.h&gt;\n\nint main() {\n    fd_set readfds;\n    struct timeval timeout;\n    int maxfd = 0;\n\n    FD_ZERO(&amp;readfds);\n    FD_SET(0, &amp;readfds); \/\/ \u76e3\u63a7\u6a19\u6e96\u8f38\u5165\n\n    timeout.tv_sec = 5; \/\/ 5\u79d2\u8d85\u6642\n    timeout.tv_usec = 0;\n\n    int ret = select(maxfd + 1, &amp;readfds, NULL, NULL, &amp;timeout);\n    if (ret &gt; 0) {\n        \/\/ \u6709\u6578\u64da\u53ef\u8b80\n    }\n    return 0;\n}\n<\/code><\/pre>\n<h2 id=\"epoll-%e7%9a%84%e6%bc%94%e9%80%b2-GCpJzPbdxj\">Epoll \u7684\u6f14\u9032<\/h2>\n<p>\u96a8\u8457\u7db2\u7d61\u61c9\u7528\u7684\u767c\u5c55\uff0c\u5c0d\u9ad8\u4f75\u767c\u7684\u9700\u6c42\u65e5\u76ca\u589e\u52a0\uff0cSelect \u7684\u5c40\u9650\u6027\u9010\u6f38\u986f\u9732\u3002Epoll \u4f5c\u70ba Linux \u5e73\u53f0\u4e0a\u7684\u4e00\u7a2e\u65b0\u578b IO \u591a\u8def\u5fa9\u7528\u6280\u8853\uff0c\u514b\u670d\u4e86 Select \u7684\u4e00\u4e9b\u7f3a\u9ede\u3002<\/p>\n<h3 id=\"epoll-%e7%9a%84%e7%89%b9%e9%bb%9e-GCpJzPbdxj\">Epoll \u7684\u7279\u9ede<\/h3>\n<ul>\n<li>\u7121\u9650\u5236\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1aEpoll \u4e0d\u518d\u53d7\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26\u6578\u91cf\u7684\u9650\u5236\uff0c\u80fd\u5920\u652f\u6301\u66f4\u9ad8\u7684\u4f75\u767c\u91cf\u3002<\/li>\n<li>\u4e8b\u4ef6\u9a45\u52d5\uff1aEpoll \u4f7f\u7528\u4e8b\u4ef6\u9a45\u52d5\u7684\u65b9\u5f0f\uff0c\u80fd\u5920\u66f4\u9ad8\u6548\u5730\u8655\u7406\u5927\u91cf\u7684\u9023\u63a5\u3002<\/li>\n<li>\u6027\u80fd\u512a\u8d8a\uff1a\u5728\u9ad8\u4f75\u767c\u7684\u60c5\u6cc1\u4e0b\uff0cEpoll \u7684\u6027\u80fd\u512a\u65bc Select\uff0c\u7279\u5225\u662f\u5728\u5927\u91cf\u9023\u63a5\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<\/ul>\n<h3 id=\"epoll-%e7%9a%84%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-GCpJzPbdxj\">Epoll \u7684\u4f7f\u7528\u7bc4\u4f8b<\/h3>\n<pre><code>\n#include &lt;sys\/epoll.h&gt;\n#include &lt;unistd.h&gt;\n\nint main() {\n    int epfd = epoll_create1(0);\n    struct epoll_event event;\n    event.events = EPOLLIN;\n    event.data.fd = 0; \/\/ \u76e3\u63a7\u6a19\u6e96\u8f38\u5165\n\n    epoll_ctl(epfd, EPOLL_CTL_ADD, 0, &amp;event);\n\n    struct epoll_event events[10];\n    int nfds = epoll_wait(epfd, events, 10, 5000); \/\/ 5\u79d2\u8d85\u6642\n    if (nfds &gt; 0) {\n        \/\/ \u6709\u6578\u64da\u53ef\u8b80\n    }\n    return 0;\n}\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-GCpJzPbdxj\">\u7e3d\u7d50<\/h2>\n<p>Redis \u7684 IO \u591a\u8def\u5fa9\u7528\u6280\u8853\u4f7f\u5176\u80fd\u5920\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e2d\u4fdd\u6301\u5353\u8d8a\u7684\u6027\u80fd\u3002\u5f9e\u6700\u521d\u7684 Select \u5230\u5f8c\u4f86\u7684 Epoll\uff0c\u9019\u4e9b\u6280\u8853\u7684\u6f14\u9032\u4e0d\u50c5\u63d0\u9ad8\u4e86\u7cfb\u7d71\u7684\u6548\u7387\uff0c\u4e5f\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u66f4\u9748\u6d3b\u7684\u9078\u64c7\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u7684\u61c9\u7528\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 IO \u591a\u8def\u5fa9\u7528\u6280\u8853\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u80fd\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u5730\u5340\u7684\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 Redis \u7684 IO \u591a\u8def\u5fa9\u7528\u6280\u8853\uff0c\u4e86\u89e3 Select \u548c Epoll \u7684\u6f14\u9032\u53ca\u5176\u5c0d\u6027\u80fd\u7684\u5f71\u97ff\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-98538","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/98538","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=98538"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/98538\/revisions"}],"predecessor-version":[{"id":98539,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/98538\/revisions\/98539"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=98538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=98538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=98538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}